Rare Mineral Specimens - search page
- 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
- Sold
- Featured
- Featured in Special Editions
- Locality
- Esquire #7 claim, Big Creek, Fresno Co., California, United States
- Formula
- BaSi2O5·4H2O
- Size
- 2.5 x 1.5 x 1.5 cm - Thumbnail
- Tagged
- Ba Silicates, barium
- Special Info
- Type Locality
Striated and colorless Bigcreekite.
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Esquire #7 claim, Big Creek, Fresno Co., California, United States
- Formula
- BaSi2O5·4H2O
- Size
- 0.7 x 0.5 x 0.4 cm - Thumbnail
- Tagged
- Ba Silicates, barium
- Special Info
- Type Locality
This is a small specimen but contains excellent crystallized Bigcreekite in a "veinlet" about 1mm. The Bigcreekite is colorless and striated.
Bigcreekite is only found in California.
This specimen as well as most of the others in the Special Edition was identified by the expert on the barium-silicates, the late Robert Walstrom.
