Rare Mineral Specimens - search page
- Availability
- Sold
- Locality
- Ma'ale Adumim, Negev desert, Hatrurim Fm, Israel
- Formula
- Ca6Cr2(SO4)3(OH)12ยท26H2O
- Size
- 2 x 1.5 x 2 cm - Thumbnail
- Special Info
- Type Locality
Purple crystalline Bentorite, a rare chromium mineral, with white Portlandite.
- 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
- $45.00
- Locality
- Silver Crater mine, Bancroft, Ontario, Canada
- Formula
- (Ca,Na,U)2(Ti, Nb,Ta)2O6Z(OH)
- Size
- 1.5 x 1.5 x 1.5 cm - Thumbnail
- Special Info
- Radioactive!!
Smaller crystal with black faces.
- Availability
- Available
- Price
- $50.00
- Reduced Price
- $30.00
- Locality
- Silver Crater mine, Bancroft, Ontario, Canada
- Formula
- (Ca,Na,U)2(Ti, Nb,Ta)2O6Z(OH)
- Size
- 2 x 2 x 1.7 cm - Thumbnail
- Special Info
- Radioactive!!
Single crystal with interesting "hopper" growth on some faces.
- Availability
- Available
- Price
- $25.00
- Locality
- Namib Desert, Namibia
- Formula
- CaBi2O2(CO3)2
- Size
- 1.5 x 1.2 x 0.8 cm - Thumbnail
Light yellow powdery to crystalline crust.
- Availability
- Available
- Price
- $35.00
- Locality
- Coats peg., Petaca dist., Rio Arriba Co., New Mexico, United States
- Formula
- Bi2S3
- Size
- 3.5 x 2.5 x 1.5 cm - Miniature
- Tagged
- sulfide
Light straw yellow crystals to 4mm, an alteration of Bismuth in Quartz.
