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Ettringite & Hashemite

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ASC546993

Ettringite & Hashemite

Rare Mineral

Description Tabs

Description
Locality: 
Ma'ale Adumim, Hatrurim Formation, West Bank, Palestinian Territory (occupied)
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 2 × 1 cm
Description

Surface of this specimen is completely covered by hundreds of  ettringite Micro crystals. Originally bought this as hashemite and it's surely from the right location, but I didn't find the typical lemon-yellow hashemite single-crystals. As the specimen shows the same colour as hashemite it either forms a layer underneath the ettringite or the ettringite is couloured by chromium.

Mineral Data
What's on the rock

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

Hashemite

Formula: 
Ba(Cr,S)O4
Strunz: 
7.FA.15
Hardness: 
3.5
Colour: 
Brown
Type Locality: 
Lisdan-Siwaga Fault, Hashem region, Amman, Jordan

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