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Harmotome On Calcite

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PDM820982

Harmotome On Calcite

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Description
Locality: 
Bellsgrove Quarry, Strontian, Highland, Scotland, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.5 × 4.4 × 3.2 cm
Description

Thick snow white harmotome crystals, with glassy lustre as porcelain, richly covering a matrix of white rhombohedral calcite crystals overgrown by a second generation of honey orange coloured calcite. Under long wave illumination, calcite is yellow and pink, and under short wave illumination it is yellow in the surface and strong red in the core.

Ex Jan Sibtsen #3543.

Mineral Data
What's on the rock

Harmotome

Formula: 
(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] ·12H2O
Strunz: 
9.GC.10
Crystal System: 
Monoclinic
Hardness: 
4.0 - 5.0
Streak: 
White
Type Locality: 
St Andreasberg, St Andreasberg District, Harz, Lower Saxony, Germany

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

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