Search Archived Mineral Specimens
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Tsumeb mine, Tsumeb, Namibia
- Formula
- Cu2AsO4(OH)
- Size
- Miniature 5x2.5x2cm
- Tagged
- arsenate , copper
Stout emerald green Olivenite crystals, the longest to 8mm but averaging 3mm or so. This is a very aesthetic specimen with yellowish green botryoidal Gartrellite, which was visually identified based upon Robert Meyer's photo (thanks Robert & Mindat!) and analysis on Mindat. Of note are unidentified lighter green crystals at the base of this specimen which may be Thometzkite.
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Tsumeb mine, Tsumeb, Namibia
- Formula
- Cu2AsO4(OH)
- Size
- SmCabinet 5.5x5x3cm
- Tagged
- arsenate , copper
Outstanding specimen of Olivenite with deep green bladed crystals to 2mm with abundant spherules of what looks to be Cornwallite. Cornwallite is typically associated with Olivenite at other localities, but rare and unverified at Tsumeb. So, this would have to be tested out. Nonetheless it is a head banging specimen under the scope. But don't hurt yourself.
- Availability
- Sold
- Locality
- White Cap mine, Pennington Co., South Dakota, United States
- Formula
- KFe2+2NbO2(PO4)2·2H2O
- Size
- Thumbnail 1.5x1.2x1.2cm
- Tagged
- phosphate , pegmatite mineral
- Special Info
- Type Locality
Siderite and smoky Quartz matrix with one little area of around 1mm with a root-beer colored Olmsteadite crystal. The crystal shows faces and is striated. The color is unusual and distiguished from tiny orange crystals elsewhre in the matrix, which are secondary Sphalerite crystals.
- Availability
- Sold
- Locality
- White Cap mine, Pennington Co., South Dakota, United States
- Formula
- KFe2+2NbO2(PO4)2·2H2O
- Size
- Miniature 3.5x1.5x1cm
- Tagged
- phosphate
Deep reddish brown prismatic crystals in a divergent group to around 1mm. Very rare.
- Availability
- Sold
- Locality
- White Cap mine, Pennington Co., South Dakota, United States
- Formula
- KFe2+2NbO2(PO4)2·2H2O
- Size
- Thumbnail 0.2x0.1x0.1cm
A 1mm deep red prismatic crystal of Olmsteadite. Extremely Rare.
