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Amethyst Calcite & Harmotome

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KFT68345

Amethyst Calcite & Harmotome

Description Tabs

Description
Locality: 
Idar-Oberstein, Birkenfeld, Rhineland-Palatinate, Germany
Size Range: 
Cabinet (10-18 cm)
Size: 
11.2 × 6.8 × 4 cm
Description

A geode with ametyhste, that is covered with calcite and small crystals of harmotome.

An old classic!

Mineral Data
What's on the rock

Amethyst

Variety Of: 

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Hardness: 
7.0
Formula: 
SiO2
Hardness: 
0.0
Colour: 
Purple

Calcite

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

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