Sanidine
Revision as of 13:25, 27 April 2013 by (username removed)
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 |