Calcite

Origin: Pugh Quarry, Ohio, United States

Sample size: 5 x 3 x 3 cm (top), 6 x 5 x 4 cm (2nd row), 5 x 5 x 3 cm (bottom)

Photo courtesy of:

Tom Loomis

Dakota Matrix Minerals

Twinned calcite (butterfly)

Origin: Westfalen Mine, Rio Grande do Sol, Brazil, South America

Sample size: 2.8 x 2 x 1 cm

This specimen has two forms of calcite crystals - both rhombic and scalenohedral. The largest crystal is 1.4 cm in length (pictured on the left). Calcite was found throughout the mine. It is not rare but this specimen, with dark green diopside crystals and what appears to be xonotlite (?) is quite interesting with the two forms.

Origin: Långban, Sweden

Harry von Eckermann Collection

Sample size: 9.5 x 8 x 7 cm

This specimen of quartz has a layer of duftite and two large crystals of calcite. The calcite is rhombic in habit. One of the crystals has some small cleavages on one corner. The largest crystal is 2.5 cm on the diagonal.

This specimen has a couple of calcite crystals coloured red by inclusions of cuprite. The largest crystal is 1.5 cm across.

Origin: Tsumeb Mine, Tsumeb, Namibia

Sample size: 5.5 x 3.4 x 2.5 cm (top/2nd row), 2.5 x 2 x 2 cm (bottom)

Calcite on fluorite

Origin: Minerva #1 Mine, Hardin Co., Illinois, United States

Sample size: 6 x 5.5 x 5 cm (top/2nd row), 8 x 4.2 x 3.2 cm (3rd/4th row)

Photo courtesy of:

John Veevaert, Trinity Mineral Co

Trinityminerals.com

Calcite pseudomorph after glauberite

Origin: Camp Verde Mine, Yavapai Co., Arizona

Sample size: 6.9 x 5.8 x 3.9 cm

Photo courtesy of:

Rob Lavinsky

The Arkenstone

The specimen consists of sugary pyramidal crystals of colourless quartz to just over 3 cm in size. These in turn are scattered with colourless calcite crystals, some doubly terminated and to 13 mm in length. These in turn show dark black coatings, mostly near the terminations but not always.

Origin: Idarado Mine, Telluride, Ouray District, San Miguel Co., Colorado, U.S.A.

Sample size: 12.8 x 5.9 x 5.2 cm

Photo courtesy of:

Dan Weinrich

Dealer in fine mineral specimens

Back to Page 1 Page 2 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14