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Afwillite & Ettringite

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ZLT170882

Afwillite & Ettringite

Description Tabs

Description
Locality: 
Bellerberg, Ettringen, Eifel Mountains, Rhineland-Palatinate, Germany
Size Range: 
Micromount (under 1cm)
Size: 
0.3 × 0.8 × 0.8 cm
Description

Small fraction of a lime xenolith with a 2 mm ball of tabular, prismatic afwillite crystals and some long prismatic ettringite crystals.

Mineral Data
What's on the rock

Afwillite

Formula: 
Ca3(HSiO4)2·2H2O
Strunz: 
9.AG.75
Crystal System: 
Monoclinic:
Hardness: 
3.0 - 4.0
Streak: 
White
Type Locality: 
Dutoitspan Mine, Kimberley, Francis Baard District, Northern Cape Province, South Africa

Ettringite

Formula: 
Ca6Al2(SO4)3(OH)12·26H2O
Strunz: 
7.DG.15
Hardness: 
2.0 - 2.5
Type Locality: 
Ettringer Feld, Western lava flow, Bellerberg volcano, Ettringen, Mayen, Eifel, Rhineland-Palatinate, Germany

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