Crystal Goldstone

Chemical Formula

Microcline: KAlSi₃O₈
Oligoclase: (Na,Ca)Al_1-2Si_3-2O₈

Color

Red, Orange, Brown, Pink

Hardness

6 - 6.5

Crystal System

Triclinic

Refractive Index

1.525 - 1.548

SG

2.62 - 2.65

Transparency

Transparent to translucent

Double Refraction

0.01

Luster

Vitreous

Cleavage

2,1 - basal ; 2,1 - prismatic ; 3,1 - pinacoidal

Mineral Class

Microcline or Oligoclase