Rare Mineral Specimens - search page
- Availability
- Sold
- Locality
- 10th level, Potosi mine, Santa Eulalia, Chihuahua, Mexico
- Formula
- Mn2+4(BeSiO4)3S
- Size
- 3 x 2 x 1 cm - Thumbnail
- Tagged
- beryllium
Excellent tetrahedral crystals of orange Helvite to 1mm on Ilvaite matrix.
- Availability
- Sold
- Locality
- Hogtuva, Rana, Nordland, Norway
- Formula
- Ca4(Fe2+6Fe3+6)O4[Si8Be2Al2O36]
- Size
- 2.8 x 2.3 x 1.1 cm - Thumbnail
- Tagged
- beryllium
- Special Info
- Type & Only Locality
Elongated, thin, bladed black crystals throughout the specimen. The largest crystals reach 9mm. It is extremely rare and found only at this deposit named for the nearest prominent landmark, Høgtuva peak. It is a berllium mineral of the Aenigmatite group.
- Availability
- Sold
- Locality
- Tingelstadtjern quarry, Modum, Buskerud, Norway
- Formula
- Mg12(PO3OH,CO3)(PO4)5(OH,O)6
- Size
- 5 x 4 x 3.5 cm - Miniature
- Tagged
- phosphate
- Special Info
- Type & Only Locality
Greyish glassy crystal grains 2-3mm with Althausite. The Holtedahlite looks like Quartz. The Althausite appears as flashy cleavages. Very rare minerals and type and only locality for Holtedahlite. The yellow is serpentine.
- Availability
- Sold
- Locality
- Fengjiashan mine, Huangshi, Hubei, China
- Formula
- Ca2Mn2+Fe3+Si4O12(OH)ยท2H2O
- Size
- 2.5 x 2 x 1 cm - Thumbnail
A relatively new IMA approved mineral featuring dark root beer colored crystals of Hubeite to 3mm with minor pink bladed Inestie.
- Availability
- Sold
- Locality
- Tip Top mine, Custer Co., South Dakota, United States
- Formula
- CaBe2P2O8
- Size
- 5 x 2 x 1.5 cm - Miniature
- Tagged
- phosphate, beryllium, pegmatite mineral
The Hurlbutite is the spheroidal, murky or turbid, colorless crystals seen in the fourth and fifth photos. They actually look like fish eyes. Hurlbutite is a rather rare beryllo-phosphate found exclusively pegmatites. The Tip Top mine, to my knowledge, is the only pegmatite in which Hurlbutite forms crystals, if you call these crystals. The Montgomeryite on this specimen is a light red and forms lath-like crystals to 0.5mm in 1mm groups. Also associated are little white Englishite crystals and very tiny Whitlockite crystals.
- Availability
- Sold
- Locality
- Quiruvilca mine, Santiago de Chuco prov., La Libertad dept., Peru
- Formula
- PbTlAs5S9
- Size
- 8.5 x 4.5 x 2 cm - Sm Cabinet
- Tagged
- sulfide
Several prismatic crystals from 1 to 2mm with internal red reflections. The entire specimen is coated with secondary black and sooty Silver and Acanthite. There are also numerous well crystallized Pyrite crystals.
