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Sellaite Tridymite & Sanidine

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MEX726553

Sellaite Tridymite & Sanidine

Classic Locality

Description Tabs

Description
Locality: 
Emmelberg, Üdersdorf, Daun, Eifel, Rhineland-Palatinate, Germany
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.3 × 2 × 1.8 cm
Weight: 
11.00gr
Description

This specimen shows a rich paragenesis of colorless sanidine crystals over white overgrown to clear tridymite plates to the rare rods of sellaite.
 

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

Tridymite

Formula: 
SiO2
Strunz: 
4.DA.10
Crystal System: 
Triclinic - Pedial
Hardness: 
6.5 - 7.0
Streak: 
White
Type Locality: 
Cerro San Cristóbal, Mun. de Pachuca, Hidalgo, Mexico

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