Druzy Quartz | Gemopedia

The word drusy, spelled with an s and pronounced with a z, is a mineralogical term that is used as both a noun and an adjective. The noun refers to mineral cavities which are lined (usually in quartz) with thin layers of tiny, tightly-packed crystals that resemble sugar granules. Each of these toppings are of a different fineness ranging from coarse to powdery. The mineral crust may also be found where it grew externally over another previously formed mineral. The adjective refers to any such granulated crystal layers.
Alternate
Names
Druse Quartz

Druzy Quartz Classification

Common Name

Druzy Quartz

Species

Quartz

Variety

Colors

various colors

Alternate Names

druse quartz

Gemstone Groups

Key Separations

Appearance, refractive index, birefringence.

Comments

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

Druzy Quartz Optical Properties

Transparency

Doubly Refractive (Dr) Or Agg Depending On Transparency

Refractive Index

1.544-1.553 Tolerance: very constant

Birefringence

Optic Character

uniaxial

Optic Sign

positive

Polariscope Reaction

doubly refractive (DR) or AGG depending on transparency

Fluorescence

CCF Reaction

Pleochroism

Dispersion

Druzy Quartz Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Polycrystalline

Druzy Quartz Characteristic Physical Properties

Hardness

7

Streak

Specific Gravity

Toughness

Fair To Good

Inclusions

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

Luster

Vitreous To Metallic

Stability

Fair To Good

Fracture

Conchoidal

Cleavage

None To Very Poor

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