Difference between revisions of "Sanidine"
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Revision as of 07:48, 24 July 2013
Description
A high temperature form of potassium feldspar that typically is found in volcanic rocks such as obsidian and rhyolite. The colorless to white stone has tabular, or sometimes acicular, crystals.
Other Properties
Monoclinic crystal system; cleavage = perfect in one direction; fracture = uneven; luster = vitreous; streak = white;
| Composition | (K,Na)(Si,Al)4O8 |
|---|---|
| Mohs Hardness | 6 |
| Density | 2.52 |
| Refractive Index | 1.518 - 1.530 |