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Hydroxyapophyllite-(K) On Thaumasite

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PDM733354

Hydroxyapophyllite-(K) On Thaumasite

Gem Crystal

Description Tabs

Description
Locality: 
Mofjellet Mine, Rana, Nordland, Norway
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 3 × 3 cm
Largest Crystal: 
1.00cm
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.

 

Further information and free download:

Larsen, A. 0.: Hydroxyapophyllite from the Mofjellet mine, Mo i Rana, northem Norway. Contributions to the mineralogy of Norway, No. 66. Norsk Geologisk Tidsskrift, Vol. 61, pp. 297-300. Oslo 1981. ISSN 0029-196X

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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