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Epidote & Actinolite

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ARM741469

Epidote & Actinolite

Description Tabs

Description
Locality: 
Imilchil, Errachidia Province, Drâa-Tafilalet Region, Morocco
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.6 × 3.4 × 1.5 cm
Largest Crystal: 
1.50cm
Weight: 
28.00gr
Description

Cluster of lustrous dark green fan-shaped epidote crystals with acicular pale green amianth in the pockets between the epidotes. Twisting of crystals is a consequence of very unusual growth process. They do not grow by classic crystallization, but form by rapid precipitation and self-assembly of nanosized crystallites that attach due to electrostatic interactions of van der Waals type. Known examples are quartz gwindels, saddle dolomite, stilbite tie-bows, etc., all resulting from this assembly process. Here, we see a fine example of epidote doing the same thing.

Mineral Data
What's on the rock

Epidote

Formula: 
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Strunz: 
9.BG.05a
Crystal System: 
Monoclinic
Hardness: 
6.0
Streak: 
Colorless
Type Locality: 
Bourg d'Oisans, Isère, Rhône-Alpes, France...

Actinolite

Formula: 
☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Strunz: 
9.DE.10
Crystal System: 
Monoclinic - Prismatic
Hardness: 
5.0 - 6.0
Streak: 
White

Seller Information

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