mineral general info

Acanthite pseudomorph after argentite

Origin: Mina San Juan de Rayas, Guanajuato, Mexico
Ex. Dr. Miguel Romero, Dr. Fred Pough, Irv Brown collections

Sample size: 3 x 2.75 x 1.8 cm

Acanthite on acanthite pseudomorph after pyrargyrite

Origin: San Juan de Rayas Mine, Guanajuato, Guanajuato, Mexico

Ex. Keith Hayes collection

Sample size: 7.2 x 4.4 x 2.7 cm

Acanthite pseudomorph after argentite

Origin: Freiberg, Saxony Germany

Sample size: 2.4 x 1.6 x 1 cm

Acanthite paramorph after argentite

Origin: Freiberg, Saxony, Germany

Ex. M. Dodge collection

Sample size: 2.2 x 2 x 0.8 cm

Acanthite pseudomorph after argentite

Origin: Rayas Mine, Guanajuato, Mexico

Ex. Barbara Cureton collection

Sample size: 1.1 cm cubic crystal

Acanthite pseudomorph after argentite

Origin: Guanajuato, Mexico

Ex. Richard Hauck collection

Sample size: 9.2 x 5.2 x 4.1 cm

Acanthite pseudomorph after argentite on calcite

Origin: Valencia Mine, Guanajuato, Guanajuato Prov., Mexico

Sample size: 6.2 x 5.4 x 5.3 cm

Acanthite pseudomorph after dyscrasite

Origin: Pribram, Bohemia, Czech Republic

Sample size: 10.5 x 5 x 5.5 cm

This specimen is a partial pseudomorph of acanthite after silver with smaller subsequent crystals of acanthite set on it. The original silver had spinel law twins.

Origin: Imiter, Morocco

Sample size: 2.7 x 0.7 x 0.4 cm

Acanthite pseudomorph after argentite

Origin: Lingqiu, Jiangxi Province, China

Sample size: 2.2 x 1.5 x 1.3 cm

Actinolite

Variety uralite, actinolite pseudomorphous after pyroxene

Origin:Calumet mine, Chaffee Co., Colorado, U.S.A.

Sample size: 7 x 4 x 3 cm with blocky or prismatic crystals to 1.5 cm

Matrix covered by green prismatic "uralite", or actinolite pseudomorph after pyroxene crystals.

Origin: Calumet mine, Salida, Colorado, U.S.A.

Sample size: 30 x 25 x 12 mm

Variety uralite, actinolite pseudomorph after diopside

Origin: Calumet Mine, Chaffee Co., Colorado, U.S.A.

Sample size: 5.5 x 5 x 5.5 cm (top), 9.8 x 5.7 x 3.5 cm (2nd row), 5.3 x 4.8 x 3.9 cm (bottom)

Nephrite pseudomorph after quartz

Origin: effery City, Fremont Co., Wyoming, U.S.A.

Sample size: 9 x 7 x 33 mm

Needle-like crystals of actinolite pseudomorph after diopside to 3 mm in length in several open veins with magnetite

Origin: Calumet Mine, Chaffee Co., Colorado, U.S.A.

Sample size: 7.7 x 5.6 x 4.2 cm

Magnetite on actinolite pseudomorph after diopside ("uralite")

Origin: Calumet Mine, Chaffee Co., Colorado, U.S.A.

Sample size: 4.7 x 3.3 x 3 cm

Magnetite with actinolite pseudomorph after diopside

Origin: Calumet Mine, Chaffee Co., Colorado, U.S.A.

Sample size: 5 x 2.9 x 3.1 cm

Green opaque prismatic crystals of "uralite"(actinolite pseudomorph after diopside) to 3 mm in length. Minor black magnetite in association.

Origin: Calumet Mine (Calumet; Calumet No. 2; Hecla; Hecla No. 2; Calumet Iron Mine; Calumet-Hecla-Smithville Magnetite Deposit; Patented Placer Claims: Calumet; Hecla-Williamson; Smithville No. 2; CF&I Company Mine), Turret District, Chaffee Co., Colorado, U.S.A.

Sample size: 6.1 x 8.8 x 5.9 cm

Albite

Albite pseudomorph after scapolite

Origin: Griffith, Ontario, Canada

Sample size: 4.4 x 3.8 x 5.8 cm

Analcime

Pseudomorph of mm-sized white analcime crystals after three intergrown natrolite crystals (2.5; 5 and 7 cm long); the analcime is coated with white albite; Ex. collection Gilles Haineault

Origin: Mont Saint-Hilaire, Quebec, Canada

Sample size: ca. 2 x 7 cm

Anatase

Anatase pseudomorph replacing titanite on dolomitic matrix

Origin: Corral Canyon, Stillwater Range, Churchill Co., Nevada, United States

Sample size: 5 x 5 x 4 cm, crystals to 0.75 mm

Anatase pseudomorph after titanite on microcline

Origin: Cardiff Mine, Wilberforce, Ontario, Canada

Ex. Don Belsher collection

Sample size: 5.2 x 4.3 x 2.7 cm

Andradite

Andradite pseudomorph after muscovite

Origin: Franklin, Sussex Co., New Jersey, U.S.A.

Ex. Hauck collection

Sample size: 7.3 x 6.7 x 1.2 cm

Hausmannite with andradite cast after calcite (pseudomorph)

Origin: N'Chwaning II Mine, Kuruman, Cape Province, South Africa

Ex. John Schneider collection

Sample size: 5.3 x 4.6 x 3 cm

Andradite pseudomorph after twinned rhodochrosite crystal with gaudefroyite

Origin: Wessels Mine, Kalahari Manganese Fields, South Africa

Ex. Charlie Key collection

Sample size: 5.6 x 2.1 x 1.3 cm (top), 5.5 x 5.3 x 1.7 cm (bottom)

Anglesite

Anglesite pseudomorph after galena with linarite and brochantite

Origin: Blanchard Mine, Socorro, New Mexico, U.S.A.

Sample size: 3.7 x 2.2 x 1.7 cm

Anglesite pseudomorph after galena with minor fluorite

Origin: Bingham, New Mexico, U.S.A.

Ex. Don Belsher collection

Sample size: 4 x 3.6 x 5.8 cm

Galena altering to anglesite (pseudomorph)

Origin: Bingham, Hansonburg District, New Mexico, U.S.A.

Sample size: 6.3 x 5.2 x 3.2 cm

Anglesite pseudomorph after galena

Origin: Purisma Workings, West Camp, Santa Eulalia, Chihuahua, Mexico

Ex. Don Belsher collection

Sample size: 5.4 x 4 x 3.4 cm

Anglesite coating on fluorite (pseudomorph)

Origin: Bingham, New Mexico, U.S.A.

Sample size: 10.7 x 9.3 x 4.4 cm

Anglesite pseudomorph after galena

Origin: Blanchard Mine, Bingham, Socorro Co., New Mexico, U.S.A.

Sample size: 10.8 x 10.8 x 4.2 cm

Anglesite pseudomorph after galena on quartz with malachite and fluorite

Origin: Blanchard Mine, Bingham, Socorro County, New Mexico, U.S.A.

Sample size: 7 x 5 x 3.5 cm

Anglesite pseudomorph after cerussite

Origin: Broken Hill Mine, New South Wales, Australia

Sample size: 4.2 x 3 cm

Anglesite pseudomorph after galena

Origin: Blanchard Claims, Bingham, New Mexico, U.S.A.

Sample size: 3 x 2.8 x 2.5 cm

Anglesite pseudomorph after pyromorphite

Origin: Midnight Mine, Kellogg, Idaho, U.S.A.

Ex. G. Hansen collection

Sample size: 8.1 x 5.3 x 3.1 cm

This specimen is comprised of anglesite pseudomorphs after cerussite. The twinned nature of the original cerussite is clearly visible in the pseudomorphs.

Origin: Broken Hill, New South Wales, Australia

Ex. Frank Edwards collection

Sample size: 8.5 x 5.7 x 5.2 cm

Linarite with anglesite pseudomorph after galena with cerussite and brochantite

Origin: Sunshine No. 1 Adit, Blanchard Mine (Portalas-Blanchard Mine), Bingham, Hansonburg District, Socorro Co., New Mexico, U.S.A.

Sample size: 2 x 3.5 x 3.5 cm

Linarite on anglesite pseudomorph after galena

Origin: Blanchard Mine, Socorro, New Mexico, U.S.A.

Sample size: 2.1 x 1.8 x 1.6 cm

Anhydrite

This pocket specimen is dominated by an undamaged, 7.5 cm, lustrous, translucent, gray calcite crystal and is surrounded by tiny laumontite needles, brown stilbite blades, and botryoidal, green prehnite. The whole specimen rests on anhydrite casts after laumontite (pseudomorph).

Origin: Prospect Park Quarry, Passaic Co., New Jersey, U.S.A.

Ex. Rutgers University collection

Sample size: 11.7 x 7.5 x 6.0 cm

Ankerite

Ankerite pseudomorph after siderite

Origin: St. Marie-aux-Mines, Alsace, France

Sample size: 8.5 x 3.5 x 8 cm

Antigorite

Antigorite (serpentine) pseudomorph after chondrodite with magnetite and kaolinite

Origin: Tilly Foster Mine, Brewster, Putnam County, New York, U.S.A.
ex. Albert Sebela Collection

Sample size: 5 x 5 x 3 cm

Apatite

This specimen is of quartz is covered with pale pink apatite. The rock seems to have pseudomorphs of apatite after siderite (?) but I am not at all certain. The habit is quite unusual regardless.

Origin: Schlaggenwald, Bohemia, Czech Republic, Europe

Ex. Frank Edwards Collection

Sample size: 8 x 7.5 x 3.5 cm

Aragonite

Aragonite pseudomorph after gaylussite

Origin: Timir Peninsula, Russia

Sample size: 5.4 x 4.9 x 3.5 cm

Aragonite coating quartz (pseudomorph)

Origin: Santa Eulalia, Chihuahua, Mexico

Ex. Zinn collection

Sample size: 9.1 x 4.1 x 3.1 cm

Aragonite pseudomorph after glauberite

Origin: 2 miles SW of Camp Verde, Yavapai Co., Arizona, U.S.A.

Sample size: thumbnail

Argentite

Argentite pseudomorph after galena with proustite and xanthoconite on barite

Argentite pseudomorph after galena

Origin: "Old Hope of God" pit, Free Mountain, Kleinfeldsberg, near Freiberg, Saxony, Germany

Sample size: 4.5 x 2.8 x 2.3 cm (top), 3 x 3 x 2 cm (bottom)

Argentite pseudomorph after stephanite
Origin: Fresnillo, Zacatecas, Mexico

Ex. Marilyn Dodge collection

Sample size: 2.4 x 1.8 x 1.1 cm

Arsenic

Arsenic pseudomorph after ? on quartz

Origin: Gabe Gottes, Markirch, Alsace, France

Sample size: 10.5 x 5.5 x 4 cm

Arsenopyrite

Arsenopyrite pseudomorph after pyrrhotite

Origin: Double Rainbow mine, Lawrence Co., South Dakota, USA

Sample size: 10 x 4 x 2 cm

Arsenopyrite pseudomorph after pyrrhotite, with siderite, pyrite and sphalerite

Origin: Double Rainbow mine, Lawrence Co., South Dakota, USA

Sample size: about 10 x 9 cm

Arsenopyrite pseudomorph after pyrrhotite

Origin: Noche Buena, Zacatecas, Mexico

Ex. Don Belsher collection

Sample size: 4.5 x 3.4 x 2.7 cm
© Dan Weinrich

Arsenopyrite pseudomorph after pyrrhotite on quartz

Origin: Casapalca Mine, Lima Dept., Peru

Sample size: 6.8 x 9.6 x 2.4 cm

Arsenopyrite pseudomorph after pyrrhotite on sphalerite

Origin: Huanzala Mine, Huanuco Dept., Peru

Sample size: 6.7 x 5.4 x 2.6 cm

Arsenopyrite pseudomorph after pyrrhotite

Origin: Double Rainbow Mine, Galena, South Dakota, U.S.A.

Sample size: 6 x 4.5 x 3.3 cm

Arsenopyrite pseudomorph after pyrrhotite on quartz matrix with minor sphalerite

Origin: Casapalca, Huarochiri province, Lima Dept., Peru

Sample size: 9.3 x 6.4 x 2.5 cm

Arsenopyrite pseudomorph after pyrrhotite

Origin: Huanzala Mine, Huanuco Dept., Peru

Ex. Don Belsher collection

Sample size: 4.3 x 3.8 x 2.8 cm

Arsenopyrite pseudomorph after pyrrhotite

Origin: Double Rainbow Mine, Galena, South Dakota, U.S.A.

Ex. Richard Hauck collection

Sample size: 10.6 x 6.5 x 3.3 cm

Arsentsumebite

Arsentsumebite pseudomorph after mimetite

Origin: Tsumeb, Namibia
1st Oxidation Zone circa early 1900's

Sample size: 7 x 4 x 4 cm

Arsentsumebite pseudomorph after mimetite. Ex. G. Hansen collection

Origin: Tsumeb Mine, Namibia, Africa

Sample size: 5.6 x 4.3 x 2.9 cm

Arsentsumebite pseudomorph after mimetite

Origin: Tsumeb Mine, Tsumeb, Namibia

Sample size: 4.7 x 4 x 3.6 cm

Arsentsumebite pseudomorph after mimetite

Origin: First Oxidation Zone, Tsumeb, Otjikoto Region, Namibia

Ex. Ed Rosenzweig collection

Sample size: 3.8 x 3.5 x 2.9 cm

Arsentsumebite pseudomorph after mimetite

Origin: Tsumeb Mine, Tsumeb, Namibia

Sample size: 3.6 cm

Azurite

Azurite pseudomorph after chalcostibite

Origin: near Casablanca, Atlast Mountains, Morocco

Sample size: 4.2 x 3.2 x 1.7 cm

Hollow cast of azurite with underlying malachite

Origin: Bisbee, Cochise Co., Arizona, U.S.A.

Sample size: 11 x 6.5 x 3.5 cm

Azurite pseudomorph cast after gypsum

Origin: Apex Mine, Saint George, Washington Co., Utah, U.S.A.

Sample size: 1.8 x 0.9 x 7.6 cm

Azurite pseudomorph after chalcostibite

Origin: Gar El Anz, Morocco

Sample size: 3.5 x 3.0 x 2.0 cm

Azurite pseudomorph after chalcostibite

Origin: Rar-el-Anz, Cherrat Wadi, Casablanca Prefecture, Grand Casablanca Region, Morocco

Sample size: 22 x 18 x 27 mm

Baddeleyite

Single crystal specimen of very rare baddeleyite pseudomorph after kimzeyite

Origin: Perovskite Hill, Magnet Cove, Arkansas, U.S.A.

Sample size: 0.9 x 1.0 cm

Barite

Barite pseudomorph after alstonite, to 5 mm in size, associated with sphalerite

Origin: Haggs mine, Nentsberry, Cumbria, Great Brittain

Sample size: 4 x 3 x 2 cm

Matrix of crystallized lustrous black sphalerite with a scattering of white barite after alstonite pseudomorphs, with crystals to 6 mm in size.

Origin: High Raise 2nd Sun Vein, Nentsberry Haggs mine, Alston Moor, Cumbria, England

Sample size: 7 x 5.5 x 1.5 cm (top), 3 x 3 x 3 cm (bottom)

Barite pseudomorph after alstonite on sphalerite

Origin: High Raise 2nd Sun Vein, Nentsberry Haggs mine, Alston Moor, Cumbria, England

Sample size: 10.5 x 5.5 x 3 cm

White barite pseudomorph after alstonite with lustrous black sphalerite

Origin: Lower Flats, Admiralty Flats, 2nd Sun Vein, Nentsberry Haggs Mine, Nent Valley, Alston Moor District, North Pennines, Cumbria (Cumberland), England, UK

Sample size: 5.8 x 5.5 x 3.3 cm

Barite pseudomorph after celestine on fluorite

Origin: Annabelle Lee Mine, Illinois, U.S.A.

Ex. Marty Zinn collection

Sample size: 5.3 x 5.8 x 4.8 cm

Calcite on barite pseudomorph after quartz

Origin: Shang Bao Mine, Hunan Province, China

Sample size: 17.5 x 14.6 x 11.6 cm

Barite pseudomorph after calcite

Origin: N'Chwaning I Mine, N'Chwaning Mines, Kalahari manganese fields, Northern Cape Province, South Africa

Sample size: 9.8 x 5.5 x 9 cm

Barite pseudomorph after alstonite with sphalerite

Origin: 2nd Sun Vein Admiralty Flats, Nentsberry Haggs Mine, Nent Valley, Alston Moor District, North Pennines, Cumbria (Cumberland), England, UK

Ex. Scott Williams collection

Sample size: 7.5 x 4 x 1.7 cm

Barite pseudomorph after alstonite

Origin: 2nd Sun Vein, Admiralty Flats, Nentsberry Haggs Mine, Nent Valley, Alston Moor District, North Pennines, Cumbria (Cumberland), England, UK

Ex. Scott Williams collection

Sample size: 3 x 3.3 x 1.1 cm

Bassanite

Bassanite after gypsum

Origin: Taft, Kern Co., California, U.S.A.

Owner: Lou Perloff

Microscopic image

White bassanite pseudomorphous after gypsum

Origin: Ronneburg U deposit, Gera district, Thuringia, Germany

Picture size: 3.7 mm

White bassanite pseudomorphous after gypsum

Origin: Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia

Picture size: 4 mm

Bayldonite

Azurite with bayldonite pseudomorph after mimetite, from first oxidation zone

Origin: Tsumeb, Namibia

Ex Sussman Collection

Sample size: 8 x 6 x 5 cm

Bayldonite pseudomorph after mimetite, ex. Carlton Davis Collection
1st Oxidation Zone circa early 1900's

Bayldonite pseudomorph after mimetite, ex. Dr. Georg Gebhard Collection

Origin: Tsumeb, Namibia

Sample size: 2.7 x 1.7 x 1.7 cm (top), 5 x 5 x 3.5 cm (2nd/3rd row), 5 x 4 x 3.5 cm (bottom)

Bayldonite partly pseudomorph after mimetite

Origin: Tsumeb Mine, Tsumeb, Namibia

Sample size: 9.8 x 7.9 x 5.4 cm

Bayldonite pseudomorph after mimetite, ex. Sussman Collection, ex. Thometzek Collection (mine manager circa 1908), ex.Humboldt Museum/University of Berlin, ex. Dr. Georg Gebhard Collection

Bayldonite pseudomorph after mimetite, ex. Ernie Schlichter collection

Origin: Tsumeb, Namibia

Sample size: 13 x 8 x 6 cm (top), 4.1 x 3.8 x 3.6 cm (bottom)

Bayldonite pseudomorph after mimetite with mimetite

Origin: Tsumeb Mine, Tsumeb, Namibia

Ex. Gary Hansen collection

Sample size: 5.8 x 3.8 x 3.2 cm

Bayldonite pseudomorph after mimetite on dolomite

Origin: Tsumeb Mine, Tsumeb, Namibia

Ex. Mitch Gunnell collection

Sample size: 7.0 x 4.3 x 3.2 cm

Bindheimite

Microphoto, bindheimite pseudomorph after ullmannite 1 mm crystal

Origin: Hendre Felen Mine, Ysbyty Ystwyth, Ceredigion (Dyfed; Cardiganshire), Wales, UK

Bindheimite pseudomorph after stibnite

Origin: Pershing Co., Nevada, U.S.A.

Ex. Don Belsher collection

Sample size: 3.4 x 3.7 x 1.8 cm

Biotite

Biotite pseudomorph after tourmaline

Origin: Willow Springs, Oracle, Pinal Co., Arizona, U.S.A.

Sample size: 10 x 5.5 x 6.2 cm

Biotite pseudomorph after tourmaline

Origin: Willow Springs, Oracle, Pinal County, Arizona, U.S.A.

Ex. Don Belsher collection

Sample size: 3.8 x 1.6 x 1.4 cm (top), 3.5 x 1.6 x 1.2 cm (bottom)

Birnessite

Birnessite pseudomorph after serandite with feldspar

Origin: Mt. St. Hilaire, near Montreal, Quebec, Canada

Sample size: 3.5 x 1.75 x 1 cm

Bismutite

2 mm bismutite pseudomorph after unknown, with tourmaline

Origin: Wheal Remfry, St Austell, Cornwall, England, UK

Greenish bismutite pseudomorphous after bismuthinite

Origin: Vater Abraham Mine (Shaft 139), Lauta, Marienberg District, Erzgebirge, Saxony, Germany

Picture size: 4.5 mm

Bixbyite

Doubly terminated topaz with a couple of garnets and bixbyite pseudomorph after garnet
Origin: Thomas Range, Juab Co., Utah, U.S.A.

Ex. Gary Hansen collection

Sample size: 5.5 x 2.0 x 1.3 cm

Bornite

This specimen is comprised of crystalline chalcocite and bornite pseudomorph after chalcocite. Crystalline chalcocite is found as darker bluish coloured crystals with hexagonal form.

Origin: Flambeau Mine, Ladysmith, Rusk Co., Wisconsin
Ex-F. John Barlow Collection

Sample size: 7 x 4.5 x 4 cm