Drusy Quartz | Gemopedia

The word "drusy," is a mineralogical term used as both a noun and an adjective. The noun refers to a mineral coating of thin layers of tiny, tightly-packed crystals that resemble glittering sugar granules. The adjective refers to any such granulated crystal layers in reference to a given mineral; in this case, drusy quartz. Drusy quartz is usually found in the inside of geodes. When fashioned into loose gemstones and jewelry, it is often coated with a metallic color to capitalize on the glittering natural crystal facets and give it a more bold appearance.
Alternate
Names
Druse Quartz, Druzy Quartz
Colors
Various Colors

Drusy Quartz Classification

Common Name

Drusy Quartz

Species

Quartz

Variety

Colors

Various Colors

Alternate Names

Druse Quartz, Druzy Quartz

Gemstone Groups

Key Separations

Appearance, refractive index, birefringence

Comments

Drusy or druse is a fine layer of crystals that coat a rock or mineral.

Drusy Quartz Optical Properties

Transparency

Translucent - Opaque

Refractive Index

1.544-1.553
Tolerance:very constant

Birefringence

Optic Character

Uniaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

None

Dispersion

Comments

Drusy Quartz Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Polycrystalline

Comments

Drusy Quartz Characteristic Physical Properties

Hardness

7

Streak

Specific Gravity

Toughness

Varies

Inclusions

Drusy quartz is often treated by means of CVD to give a metallic luster and range of colors.

Luster

Vitreous

Stability

Fair

Fracture

Conchoidal

Cleavage

None

Comments

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