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Harmotome Brewsterite-Sr & Calcite

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Harmotome Brewsterite-Sr & Calcite

Description Tabs

Description
Locality: 
Whitesmith Mine, Strontian, Argyll, Scotland, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.6 × 3.1 × 2.2 cm
Weight: 
39.00gr
Description

Nice bright white blocky harmotome crystals on matrix with lamellar calcite crystals. Also presemt are lots of small brewsterite-Sr crystals many of which display a green opaque colur, possibly from chlorite mineral inclusions or replacement??

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

Brewsterite-Sr

Formula: 
(Sr,Ba,Ca)[Al2Si6O16]·5H2O
Strunz: 
9.GE.20
Hardness: 
5.0
Colour: 
White
Streak: 
White
Type Locality: 
Strontian, North West Highlands (Argyllshire), Scotland, UK

Calcite

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

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Thank you for viewing my auctions. It goes without saying that maintaining high standards in both specimen quality and customer service are extremely important to me. If for any reason you are not happy with any aspect of your transaction then please let me know as soon as possible, ideally within 1 week of receiving your specimen. I will happily do all in my power to resolve the situation to your satisfaction. If your specimen is damaged upon delivery simply send me some photos to verify this and I'll provide you with a full refund or a replacement specimen, whichever you prefer. 

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