Fine Mineral Specimens Over $50
- Availability
- Sold
- Locality
- Rabejac mine, Le Puech, Herault, France
- Formula
- Al(UO2)2(AsO4)2F·20H2O
- Size
- 2 x 1.5 x 2 cm - Thumbnail
- Tagged
- arsenate
Light green crystal scales. Fairly rare mineral.
- Availability
- Sold
- Locality
- Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy
- Formula
- KBF4
- Size
- 3.5 x 1 x 1 cm - Miniature
- Special Info
- Type Locality
Lemon yellow, earthy masses of Avogadrite in a vial. The masses are around 1cm. Avogadrite is named after Amedeo Carlo Avogadro(1776 – 1856) an Italian physicist who determined the molecular theory that the number of molecules per mole of substance is exactly 6.02214076×10^23. It is otherwise known as "Avogadro constant". It is used to this day in chemical reactions. I use it all the time when I make pizza.
Avogadrite is a three locality mineral.
- Availability
- Available
- Price
- $85.00
- Locality
- Metcalf mine, Greenlee Co., Arizona, United States
- Formula
- Cu3(CO3)2(OH)2
- Size
- 8.5 x 5.5 x 3.3 cm - Sm Cabinet
- Tagged
- carbonate, copper
Rich blue superb crystals of Azurite in sheaf-like bundles. It is lustrous and displays well.
- Availability
- Sold
- Locality
- Nordre Boksjø quarry, Idd, Halden, Østfold, Norway
- Formula
- Ca4Be2Al2Si9O26(OH)2
- Size
- 5.5 x 4 x 2 cm - Sm Cabinet
- Tagged
- beryllium
Rich specimen of tiny white pearly plates to 0.5mm on corroded. Ex. Claus Hedegaard collection (see prov. tab).
- Availability
- Available
- Price
- $75.00
- Locality
- Silver Crater mine, Bancroft, Ontario, Canada
- Formula
- A2(Ti,Nb)2O6Z
- Size
- 2 x 2 x 2 cm - Thumbnail
- Special Info
- Radioactive!!
Once known simply as the mineral species, Betafite, now in a complex mineral group called the Betafite group, which belongs to the super group of Pyrochlores with a complicated nomenclature. Compositionally, Betafites are oxides of titanium and niobium with variable subtitutions of cations uranium and calcium in the A position and variable amounts of anions O, OH, H2O, or F in the Z position.
This specimen, like the others show the cubic and octahedral forms with sharp edges.
- Availability
- Available
- Price
- $75.00
- Locality
- Harding mine, Taos Co., New Mexico, United States
- Formula
- CaLiAl2(Si2BeAl)O10(OH)2
- Size
- 6 x 6 x 3.5 cm - Sm Cabinet
Bityite is a rare beryllium-lithium mica shown here as colorless plates to 5mm in biotite.