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Pahasapaite with Tiptopite & Englishite

#BN47486

Pahasapaite with Tiptopite & Englishite

#BN47486
Availability
Sold
Size
2 x 1 x 1.5 cm - Thumbnail 
Formula
Li8(Ca,Li,K)10.5Be24(PO4)24·38H2O (RRUFF)
Locality
Tip Top mine, Custer Co., South Dakota, United States
Tagged
phosphate , beryllium , pegmatite mineral

Pahasapaite is one of the rarest minerals on Earth. It is one of five minerals with beryllium, lithium, and phosphorous in its composition and has a zeolitic structure. Tiptopite, also on this specimen is one of the five Be, Li, P minerals. Pahasapaite is also isometric, unlike most other phosphates found in pegmatites. It is usually faint pink to pink to slight orange. On this specimen, there are at least two euhedral faint pink crystals to about 0.3mm and a layer of stronger pink crystalline Pahasapaite about 2mm long seen on the side underneath a layer of Englishite and Roscherite. Beryl matrix.

By all accounts, this is a very good specimen, with crystals easily seen with a good microscope. The Pahasapaite came out during the 1980's and the pit has since flooded. I own the claims, but have not attempted to dewater, due to many complications (too many alligators).

Type & Only Locality

Pahasapaite

Formula
Li8(Ca,Li,K)10.5Be24(PO4)24·38H2
Crystal System
Isometric 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, yellow green, light pink 
Streak
white 
Class
Isometric - Tetartoidal 
Fracture
Uneven 
Hardness
4.5 

Data courtesy of Webmineral.

Collection
Dr. Buford L. Nichols Collection
Special Info
Type & Only Locality

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