Chalcedony
Origin: Namibia
Ex Dave Mansfield coll. (dealer Sid Pieters'' son-in-law)
Sample size: 8.7 x 6.4 x 3.6 cm
Origin: Nasik, Maharashtra, India
Sample size: 7.7 x 2.2 x 1.3 cm (top), 6.9 x 1.4 x 1.2 cm (bottom)
Origin: Yankee Dog Claim, New Mexico, U.S.A.
Sample size: 6.5 x 4.5 x 5 cm
Origin: Big Bend Area, Brewster Co., Texas, U.S.A.
Ex. Llewellyn collection, Zinn collection
Sample size: 6.5 x 6.2 x 5.4 cm
Chalcedony with smoky quartz
Origin: Mexico (ex. Smithsonian Inst.)
Sample size: 7.7 x 7.4 x 5.4 cm
Origin: Jalgaon, Maharashtra, India
Sample size: 10.4 x 4.9 x 3.9 cm
Origin: Trestyan, Hungary
Sample size: 4.5 x 4.2 x 1.3 cm
Detail view of a 30 mm cavity in rhyolite with probable spherical
siderite
coated with micro spherical chalcedony and secondary
calcite
overgrowth, self collected. Typical "boxworks" developed by the weathering
of massive sulfide ore deposits in the oxidation and leaching zone. Most of
the ore elements have been leached and redeposited further down in the
deposit leaving a mixture of iron oxides/hydroxides and silica minerals.
Origin: Powell property, Upper Beechmont, Numinbah Valley, Queensland,
Australia
Sample size: field of view 8 mm
Sample owner: Vic Cloete
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