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Ewaldite Harmotome & Witherite

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BSM580287

Ewaldite Harmotome & Witherite

ex Allan Dean Collection
Rare Mineral

Description Tabs

Description
Locality: 
Dolyhir Quarry, Wethel, Powys, Wales, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
4.8 × 10.2 × 4.5 cm
Description

Grey matrix with an irregular upper surface with a patchy cover of prismatic harmotome crystals that display characteristic twinned terminations,witherite and ewaldite. The ewaldite occurs as translucent tapered hexagonal crystals, one as a single crystal,the other as a small intergrown cluster. Both are in the region of 0.1 to 0.2mm in size, so a loop or microscope would enable a better view.

Previous labels supplied (not photographed)
Mineral Data
What's on the rock

Ewaldite

Formula: 
Ba(Na,Ca,Y,Ce,K)(CO3)2·2.6H2O
Strunz: 
5.CC.05
Crystal System: 
Hexagonal
Hardness: 
0.0
Type Locality: 
Diamond Alkali Daco No. 3, Green River Formation, Sweetwater Co., Wyoming, USA

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

Witherite

Formula: 
BaCO3
Strunz: 
5.AB.15
Crystal System: 
Orthorhombic
Hardness: 
3.0 - 3.5
Streak: 
White
Type Locality: 
Brownley Hill Mine (Bloomsberry Horse Level), Nenthead, Alston Moor District, North Pennines, North and Western Region (Cumberland), Cumbria, England, UK

Seller Information

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