Search Archived Mineral Specimens
- Availability
- Sold
- Locality
- Palitra pegmatite, Mt. Kedykverpakhk, Lovozero Massif, Kola Peninsula, Russia
- Formula
- Na2Si2O5
- Size
- Miniature 5x5x0.8cm
- Tagged
- pegmatite mineral
- Special Info
- XRD Confirmed
- Special Info
- EDS Confirmed
Colorless plate of Natrosilite with perfect micaceous cleavage. It is a phyllosilicate found in nepheline syenite pegmatites hosted in alkalic, differentiated massifs, namely the Kola Peninsula. I have included the water clear plate as a demonstration of its perfect cleavage. It is rare and found only in the Kola Peninsula and at Mont Saint Hilaire. Identified by Dr. Igor Pekov.
- Availability
- Sold
- Locality
- Geevor mine, Pendeen, St Just dist., Cornwall, England
- Formula
- Na5(UO2)8(SO4)4O5(OH)3ยท12H2O
- Size
- Miniature 3.5x2.5x1cm
- Special Info
- Radioactive!!
Bright yellow aggregates of thin pointed crystals and powdery masses.
- Availability
- Sold
- Locality
- Fire Creek mine, Lander Co., Nevada, United States
- Formula
- Ag2Se
- Size
- Miniature 4.5x3.5x2cm
- Tagged
- selenium , silver
An outstanding specimen of Naumannite with tiny 1 to 1.5mm crystals. The crystals are disphenoidal, which form faces of isosceles triangles. These triangles are clearly evident on these crystals. There are also other forms of crystals. The largest group is 5mm. This occurence is new for this locality.
- Availability
- Sold
- Locality
- Fire Creek mine, Lander Co., Nevada, United States
- Formula
- Ag2Se
- Size
- Miniature 4x3x1.2cm
- Tagged
- selenium , silver
Excellent specimen with large groups of Naumannite to over 7mm composed of individual and distinct crystals with triangular faces. These faces are isosceles triangles which as the literature says are faces of an orthorhombic disphenoid.
- Availability
- Sold
- Locality
- Fire Creek mine, Lander Co., Nevada, United States
- Formula
- Ag2Se
- Size
- Thumbnail 1.8x1.9x1cm
- Tagged
- silver
Gray Naumannite with crude crystals.
