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Hydroxyapophyllite-(K) On Thaumasite

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PDM665670

Hydroxyapophyllite-(K) On Thaumasite

Description Tabs

Description
Locality: 
Mofjellet Mine, Rana, Nordland, Norway
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 3.6 × 2.4 cm
Largest Crystal: 
1.60cm
Description

Transparent pseudocubic lustrous crystals of hydroxyapophyllite-(K) from Rana (Norway). Hydroxyapophyllite-(K) is the rarest of the apophyllite end-members and these specimens from the Mofjellet Mine are extremely depleted in Fluorine. Interestingly the matrix is composed of white fibrous crystals of thaumasite with satin lustre.

Acquired in 1997. Ex. J.Muizebelt.

Mineral Data
What's on the rock

Hydroxyapophyllite-(K)

Formula: 
KCa4(Si8O20)(OH,F)·8H2O
Strunz: 
9.EA.15
Hardness: 
4.0 - 5.0
Type Locality: 
Ore Knob Mine, Ore Knob, Ashe Co., North Carolina, USA

Thaumasite

Formula: 
Ca3(SO4)[Si(OH)6](CO3)·12H2O
Strunz: 
7.DG.15
Hardness: 
3.5
Streak: 
White
Type Locality: 
Bjelke Mines, Åreskutan, Åre, Jämtland, Sweden

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