Milky Quartz | Gemopedia

Milky quartz is a translucent to opaque white to light gray variety of quartz. It is not commonly used as a gemstone, but is commonly sold as mineral specimens.
Alternate
Names
Milk Quartz, Snow Quartz, Quarzo Latteo, Blue Moon Quartz If It Has Blue Sheen
Colors
White, Very Light Gray

Milky Quartz Classification

Common Name

Milky Quartz

Species

Quartz

Variety

Milky Quartz

Colors

White, Very Light Gray

Alternate Names

Milk Quartz, Snow Quartz, Quarzo Latteo, Blue Moon Quartz If It Has Blue Sheen

Gemstone Groups

Key Separations

Refractive index, appearance, birefringence, optic character and optic figure.

Comments

Misnomer: moonstone. Milky quartz is sometimes found with gold.

Milky Quartz Optical Properties

Transparency

Translucent - Opaque

Refractive Index

1.544-1.553
Tolerance:very constant

Birefringence

0.009

Optic Character

Uniaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

Unobservable

Dispersion

Comments

Milky Quartz Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Milky Quartz Characteristic Physical Properties

Hardness

7

Streak

White

Specific Gravity

2.64-2.69 Typical:2.66

Toughness

Good

Inclusions

CO2 or H2O inclusions in milky quartz give a milky appearance to the stone.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal

Cleavage

None

Comments

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