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Keiviite-(Y) & Vyuntspakhkite-(Y)

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GMA924844

Keiviite-(Y) & Vyuntspakhkite-(Y)

Description Tabs

Description
Locality: 
Stetind Pegmatite, Tysfjord, Nordland, Norway
Class: 
Crystal Group/Cluster
Size Range: 
Micromount (under 1cm)
Size: 
0.9 × 0.9 × 0.3 cm
Description

Colourless - pale brown columnar crystals of  keiviite, and tabular , elongated Vyuntspakhkite-(Y) crystals. Both are very good quality for the species.

Mineral Data
What's on the rock

Keiviite-(Y)

Formula: 
(Y,Yb)2[Si2O7]
Strunz: 
9.BC.05
Hardness: 
4.0 - 5.0
Type Locality: 
Ploskaya Mt, Western Keivy Massif, Keivy Mountains, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia...

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...

Seller Information

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