Quench-Crackled Dyed Quartz | Gemopedia

For a single crystal to be dyed, it must first be fractured. To achieve this, the method of "quench crackling" combines two types of treatment to improve or alter a stone's appearance. The first step requires the rapid heating and cooling of the stone to create fractures in its surface. The second step is the application of colored dye that is infused under pressure. The dye seeps into the cracks of the crystal to distribute the color throughout the gem.
Alternate
Names
Quench-Crackled Quartz
Colors
Various Colors Due To Dye But Most Commonly Green, Red

Quench-Crackled Dyed Quartz Classification

Common Name

Quench-Crackled Dyed Quartz

Species

Quartz

Variety

Quench Crackled Quartz

Colors

Various Colors Due To Dye But Most Commonly Green, Red

Alternate Names

Quench-Crackled Quartz

Gemstone Groups

Key Separations

Refractive index, appearance, birefringence, optic character and optic figure. A bull's-eye optic figure is determinative for quartz; may also show Airy's spiral optic figure and Brazil-law twinning under crossed polarizing filters. Spectra might show presence of Chromium in dyes.

Comments

Stones are heated and then quenched in dye.

Quench-Crackled Dyed Quartz Optical Properties

Transparency

Transparent - Translucent

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: Inert
LWUV: Inert

CCF Reaction

Pleochroism

None

Dispersion

Strength: weak fire Value: 0.013

Comments

Quench-Crackled Dyed Quartz Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Quench-Crackled Dyed Quartz Characteristic Physical Properties

Hardness

7

Streak

White

Specific Gravity

2.64-2.69 Typical:2.66

Toughness

Varies

Inclusions

Quench-crackled dyed quartz will have surface reaching fractures with dye concentrations often in a honeycomb pattern. The fractures will have an iridescent appearance.

Luster

Vitreous

Stability

Fair

Fracture

Conchoidal

Cleavage

None

Comments

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