Mineral Specimen and Product Inventory Search
- Availability
- Available
- Price
- $25.00
- Locality
- Koktokay pegmatite field, Altay, Xinjiang, China
- Size
- 1.1 x 0.7 x 0.5 cm - Thumbnail
A few tiny grains less than 1mm in polished probe epoxy. Natrobistantite is discredited bismuth-tantalum-niobium-antimony oxide.
- Availability
- Available
- Price
- $40.00
- Locality
- Magheramorne, Larne, Co. Antrim, Northern Ireland
- Formula
- Na2(Si3Al2)O10·2H2O
- Size
- 7.5 x 3.5 x 6 cm - Sm Cabinet
Natrolite radiating from a large vug 5.5cm across. Nice specimen from this little known locality.
- Availability
- Sold
- Locality
- Tanohata mine, Tohoku Region, Honshu Island, Japan
- Formula
- NaMn2+4Si5O14(OH)
- Size
- 2.2 x 1.8 x 1 cm - Thumbnail
- Special Info
- Type Locality
Orange, granular Natronambulite with one very nice gemmy crystal to about 1mm associated with crystalline Rhodonite.
- Availability
- Available
- Price
- $40.00
- Locality
- Jachymov, Erzgegirge, Bohemia, Czech Republic
- Formula
- NiSO4·6H2O
- Size
- 3 x 3 x 1.3 cm - Thumbnail
Green nondescript masses on nickel-bearing gabbro.
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Bear Meadow Adit, Quartz Hill deposit, Ketchikan district, Alaska, United States
- Formula
- NiAs
- Size
- 11.5 x 6 x 3 cm - Cabinet
- Tagged
- Ore Minerals
All of the Cobalt specimens in this update probably originated from a study conducted in the 1960's. The results were summarized in the landmark publication "The Silver - Arsenides Deposits of the Cobalt-Gowganda Region, Ontario" edited by L. G. Berry with major contributions by W. Petruk and J. L. Jambor. On page 108, Petruk describes the five assemblages of mineralization at Cobalt. This specimen clearly fits into group #1, the Nickel-Arsenide assemblage characterized by complex botryoidal masses of Nickeline inter-growths with Breithauptite, Safflorite and Cobaltite. The minerals form concentric layers and it would be impossible to differentiate visually all the minerals without a thorough microprobe study. Looking closely at the ore, one can see the plumose-texture characteristic of all of these ore specimens. It is sawed flat and polished on one side.
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Cobalt-Gowganda dist., Ontario, Canada
- Formula
- NiAs
- Size
- 9 x 7 x 2 cm - Sm Cabinet
- Tagged
- Ore Minerals
Classic nickel arsenide assemblage as described by Petruk in "The Silver-Arsenide Deposits of Cobalt...", This specimen shows the plumose ore texture so typical of Cobalt but mostly composed of brassy colored Breithauptite and Nickeline with a distinct rose hue. This assemblage was found most prevalent in at the ends, tops and bottoms of most veins. Excellent specimen showing also the Dolomitic gangue. It is sawed flat on one side and shows natural breakage on the other.
