Search Archived Mineral Specimens
- Availability
- Sold
- Locality
- Mohawk mine, Keweenaw Co., Michigan, United States
- Formula
- NiAs2
- Size
- Miniature 5x4x3.5cm
- Tagged
- nickel
Massive silvery or tin white metallic mass of Rammelsbergite nicely represented in this specimen. There are definitely other arsenides in this specimen and also on the side are spherical clusters of a copper or nickel secondary.
- Availability
- Sold
- Locality
- Mohawk mine, Keweenaw Co., Michigan, United States
- Formula
- NiAs2
- Size
- SmCabinet 7x5.5x3cm
- Tagged
- ore mineral , sulfide
Large ore specimen loaded with mostly dull, silvery Rammelsburgite with lessor quantities of brass colored Nickeline with a rosey tinge and tarnished Algodonite. The fact is all three are a little hard to tell apart and this would be a good study specimen with a SEM or a polished section. One side is cut and is likely has been well identified by polished section. Old David Garske label from Rapid City. One side as Annabergite alterations with bead like crystals a clear indication of the nickel content. There are also some bright red alterations (?), which is possibly Pyrargyrite but doesn't seem likely.
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Langis mine, Cobalt dist., Ontario, Canada
- Formula
- NiAs2
- Size
- Cabinet 11x8x1.5cm
- Tagged
- ore mineral , sulfide , nickel
A large, heavy slab of ore polished on one side. The ores of Cobalt were often slabbed for the geologist to determine the ore characterization such as the texture, how it was mineralized and paragenesis. Rammelsbergite is an ore of nickel and is a nickel arsenide. It is also a member of the Lollingite group. The Rammelsbergite occurs as silvery white anhedral grains to over 1cm. Nickeline, another nickel arsenide, can be seen as brassey or coppery red cores in the Rammelsbergite. Beyond that description, it is impossible to determine visually the phases from one mineral to the other without EDS or microprobe as in the case of the Safflorite, which contains nickel but also cobalt and iron.
- Availability
- Sold
- Locality
- Great Slave Lake, Northwest Territories, Canada
- Formula
- NiAs2
- Size
- Cabinet 10x9x5cm
- Tagged
- ore specimen , nickel
Large, impressive ore specimen of nearly all Rammelsbergite, an ore of nickel
- Availability
- Sold
- Locality
- Kobokobo Pegmatite, Sud-Kivu, Democratic Republic of Congo
- Formula
- Al(UO2)(PO3OH)(OH)3·4H2O
- Size
- Miniature 5x4x3cm
- Tagged
- phosphate
- Special Info
- Fluorescent
- Special Info
- Radioactive!!
Bright yellow beady looking crystals of extremely rare Ranunculite. The entire mass is fluorescent green so I am assuming much more here than meets the eye.
- Availability
- Sold
- Locality
- Kobokobo Pegmatite, Sud-Kivu, Democratic Republic of Congo
- Formula
- Al(UO2)(PO3OH)(OH)3·4H2O
- Size
- SmCabinet 7x5.5x5.5cm
- Tagged
- phosphate , pegmatite mineral
- Special Info
- Type Locality
An earthy mass full of secondary uranium alterations. If I have this right, and I have never seen this mineral before, the bright yellow coatings are Triangulite, which is the prevalent mineral. The light yellow crystals are the Ranunculite. However, looking at the list of minerals there are a plethora of other minerals found at this deposit including the very rare Eylettersite. This deposit features 14 type locality minerals any of which could be found on this specimen. It is a large specimen, so breaking it up analyzing it would be good thing to do. The long bladed thin crystals are columbite and even these seem to be altered. There are also brown zircon "cyrtolite". A handwritten label can be seen under the prov. tab.
