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Sellaite & Sanidine

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SER979819

Sellaite & Sanidine

Description Tabs

Description
Locality: 
Emmelberg, Üdersdorf, Daun, Eifel, Rhineland-Palatinate, Germany
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2.2 × 1.4 × 1.2 cm
Description

somew white, opaque, prismatic crystals of sellaite on a carpet of saninine crystals

Mineral Data
What's on the rock

Sellaite

Formula: 
MgF2
Strunz: 
3.AB.15
Crystal System: 
Tetragonal
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Gébroulaz glacier, Val Thorens, Savoie, Rhône-Alpes, France

Sanidine

Formula: 
KAlSi3O8
Strunz: 
9.FA.30
Crystal System: 
Monoclinic - Prismatic
Hardness: 
6.0
Streak: 
White
Type Locality: 
Drachenfels, Königswinter, Siebengebirge, North Rhine-Westphalia, Germany