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Hundholmenite-(Y) & Yttrofluorite

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RSG1097967

Hundholmenite-(Y) & Yttrofluorite

Type Locality

Description Tabs

Description
Locality: 
Hundholmen, Tysfjord, Nordland, Norway
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.5 × 2.7 × 2.2 cm
Description

Brownish grains of hundholmenite in yttrofluorite.

In a box 2.8x2.8cm, labelled

FoV : 3.8mm

 

Mineral Data
What's on the rock

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

Yttrofluorite

Variety Of: 

Fluorite

Formula: 
CaF2
Strunz: 
3.AB.25
Hardness: 
4.0
Formula: 
(Ca1-xYx)F2+x where 0.05< x <0.3
Hardness: 
0.0

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