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Vyuntspakhkite-(Y) & Hundholmenite-(Y)

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GMN706078

Vyuntspakhkite-(Y) & Hundholmenite-(Y)

Description Tabs

Description
Locality: 
Stetind Pegmatite, Tysfjord, Nordland, Norway
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.5 × 1.5 × 1 cm
Description

Brown tabular vyuntspakhite crystal with a hundholmeinite triangle.

Mineral Data
What's on the rock

Vyuntspakhkite-(Y)

Formula: 
(Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7
Strunz: 
9.BG.40
Hardness: 
6.0 - 7.0
Type Locality: 
Ploskaya Mt, Western Keivy Massif, Keivy Mountains, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia...

Hundholmenite-(Y)

Formula: 
(Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48
Strunz: 
9.AJ.35
Hardness: 
5.0 - 6.0
Type Locality: 
Hundholmen, Tysfjord, Nordland, Norway

Seller Information

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