Search Archived Mineral Specimens
- Availability
- Sold
- Locality
- White Elephant mine, Custer Co., South Dakota, United States
- Formula
- H2Ca2Fe3+6(AsO4)5(PO4)3·14H2O
- Size
- Thumbnail 1.5x1.5x0.5cm
- Tagged
- phosphate , arsenate , pegmatite mineral
- Special Info
- Type Locality
This is a type localitiy specimen of Walentaite, a mineral first discovered at the White Elephant mine. It has subsequently been found at another five localities worldwide. The crystals on this specimen are flat-lying and radial to about 0.3mm. It is small, a thumbnail but shows good crystals across the face.
It carries a Willard L. Roberts label.
- Availability
- Sold
- Locality
- Wendy pit, Tambo mine, Elqui, Coquimbo, Chile
- Formula
- (Fe3+,Te6+,Ti4+,Mg)Te4+3O8
- Size
- Thumbnail 2x1.5x0.6cm
- Tagged
- tellurium
- Special Info
- Type Locality
A tiny string of cubic brownish crystals. Extremely rare. It is a two-locality mineral.
- Availability
- Sold
- Locality
- Clue de Roua, Alpes-Maritimes, Alpes-Cote d'Azur, France
- Formula
- (Ca,Cu)4Fe2+6(AsO4,SiO4)4(OH,O)8 · 18H2O
- Size
- Thumbnail 0.5x0.3x0.3cm
- Tagged
- arsenate , copper
Light brown areas in photos - too small to describe. It is an ex-Excalibur specimen. The green is not identified. It must be the only mineral or word with 6 L's. Named after the WallKill Valley, NJ where Sterling Hill is located. But this locality in France is intriguing with nine type locality minerals.
- Availability
- Sold
- Locality
- Esquire #8 claim, Big Creek, Fresno Co., California, United States
- Formula
- BaCa2Si3O9
- Size
- SmCabinet 6x2x2.5cm
- Tagged
- Ba Silicates
- Special Info
- Fluorescent
Granular Walstromite crystals to 1mm scattered on one side of specimen showing a bright orange response to SW UV. Comes with a label signed by Robert Waltsrom.
- Availability
- Sold
- Locality
- Esquire #8 claim, Big Creek, Fresno Co., California, United States
- Formula
- BaCa2Si3O9
- Size
- Miniature 4.5x3.5x3cm
- Tagged
- Ba Silicates
- Special Info
- Fluorescent
Faint green large plates of Walstromite to 1.5cm which gives a nice orange response to LW and SW UV. Signed label from the man who the mineral is named after, Robert E. Walstrom. Robert mined these specimens and brought them to market.
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Esquire #8 claim, Big Creek, Fresno Co., California, United States
- Formula
- BaCa2Si3O9
- Size
- Thumbnail 2.5x2.5x2.5cm
- Special Info
- Fluorescent
- Special Info
- Signed Label
A thumbnail specimen in which the Walstromite shows strong orange responce to SW UV.
Walstromite is named in honor of Robert E. Walstrom (1937-2022), who discovered it while prospecting for barium. From Mindat: He has 12 minerals new to science to his credit, already published (2008), with more in the works. I never knew Bob real well, but from what I gather he was an amazing field collector as well as a great mineralogist.
Please see the provenance tab for Bob's signed label.
