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Harmotome On Calcite

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PDM854370

Harmotome On Calcite

Description Tabs

Description
Locality: 
Bellsgrove Quarry, Strontian, Highland, Scotland, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
12.9 × 5.9 × 4.3 cm
Weight: 
338.00gr
Description

Thick snow white harmotome crystals, with glassy porcelanic lustre, 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.

Found in 1997 by J.Sibtsen. Ex Jan Sibtsen #3540.

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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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