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Ralstonite with Thomsenolite & Wulfenite

#42511

Ralstonite with Thomsenolite & Wulfenite

#42511
Availability
Sold
Size
7 x 5 x 5 cm - Sm Cabinet 
Formula
Na0.5(Al,Mg)2(F,OH)6·H2O (RRUFF)
Locality
Ivigtut Cryolite deposit, Ivigtut, Arsuk Fjord, Sermersooq, Greenland

Cryolite matrix with a lot of Siderite hosting many vugs filled with waterclear Thomsenolite and iron-stained, excellent crystals of Ralstonite. On the backside are minute single crystals, hardly noticeable creamy yellow Wulfenite, less than 0.6mm on "hagemannite", a mixture of limonite and thomsenolite. This is a very good combination specimen with good crystals.

Type Locality

Ralstonite

Formula
Na0.5(Al,Mg)2(F,OH)6·H2
Crystal System
Isometric 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous - Greasy 
Color
colorless, white 
Streak
white 
Class
Isometric - Hexoctahedral 
Fracture
Brittle - Uneven 
Hardness
4.5 

Data courtesy of Webmineral.

Collection
Eaton Collection
Special Info
Type Locality

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