Crystal Petrified Wood

Chemical Formula

SiO₂

Color

White, Blue, Red, Green, Yellow, Orange, Brown, Gray, Black, Banded, Multicolored

Hardness

6.5 - 7

Crystal System

Hexagonal

Refractive Index

1.54 - 1.55

SG

2.63 - 2.65

Transparency

Opaque

Double Refraction

.009

Luster

Vitreous

Cleavage

Indiscernible

Mineral Class

Quartz (Chalcedony). See also the Jasper mineral page.