Quartzite | Gemopedia

Quartzite is a metamorphic rock formed when sandstone (made up of tiny grains of quartz) is subjected to heat and pressure under Earths surface, fusing the sand grains together. The result is an extremely durable rock that can also be dyed to attractive colors.
Colors
Usually White To Gray, But Can Be Pink, Red, Yellow, Green, Blue, Orange Due To Impurities

Quartzite Classification

Common Name

Quartzite

Species

Quartz

Variety

Quartzite

Colors

Usually White To Gray, But Can Be Pink, Red, Yellow, Green, Blue, Orange Due To Impurities

Alternate Names

Gemstone Groups

Key Separations

Appearance, RI and magnification. Might show a band in the orange section of the spectra if dyed.

Comments

Quartzite Optical Properties

Transparency

Translucent - Opaque

Refractive Index

1.544-1.553
Tolerance:very constant

Birefringence

0.009

Optic Character

Optic Sign

Polariscope Reaction

Aggregate (AGG)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

None

Dispersion

Strength: none

Comments

Quartzite Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Rock

Nature

Natural

Crystallinity

Aggregate

Comments

Quartzite Characteristic Physical Properties

Hardness

7

Streak

White

Specific Gravity

2.64-2.69 Typical:2.66

Toughness

Good

Inclusions

Quartzite is an aggregate of tightly packed quartz grains.

Luster

Dull

Stability

Good

Fracture

Conchoidal, Granular

Cleavage

None

Comments

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