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Orthoclase Var Carlsbad Twin

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GRA502016

Orthoclase Var Carlsbad Twin

Gem Crystal

Description Tabs

Description
Locality: 
Escalante, Iron County, Utah, United States of America
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4 × 2.5 × 2 cm
Largest Crystal: 
2.20cm
Weight: 
16.00gr
Description

Sharply terminated orthoclase feldspar, gem-quality crystal showing additional penetrations  Crystal demonstrates monoclinic Carlsbad twinning behavior in rhyolite matrix. 

There are other feldspar phenocrysts in the matrix. The main crystal exhibits some translucence. We classify this specimen as orthoclase (as opposed to sanidine) due to the relatively low percentage of biotite, a thermal indicator of formation.
 

Mineral Data
What's on the rock

Orthoclase

Formula: 
KAlSi3O8
Strunz: 
9.FA.30
Hardness: 
6.0
Streak: 
White
Ground Water Resources, Inc.

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