Quartz (Synthetic) | Gemopedia

Synthetic quartz is created by a process called hydrothermal growth. Hydrothermally grown synthetic gems crystallize slowly out of a solution (a mix of water and dissolved elements) that has been exposed to heat and pressure similar to the conditions on Earth under which the natural gem mineral grows. Synthetic gems have the same chemical, optical, and physical properties of their natural counterparts, but are a more cost-effective alternative to a natural gem.
Alternate
Names
Synthetic Amethyst, Synthetic Citrine, Synthetic Ametrine, Synthetic Quartz
Colors
Purple, Medium To Light Pink, Light To Medium Blue, Yellow, Bi-Color, Colorless

Quartz (Synthetic) Classification

Common Name

Quartz (Synthetic)

Species

Quartz

Variety

Synthetic Amethyst, Synthetic Citrine, Synthetic Ametrine, Synthetic Quartz

Colors

Purple, Medium To Light Pink, Light To Medium Blue, Yellow, Bi-Color, Colorless

Alternate Names

Synthetic Amethyst, Synthetic Citrine, Synthetic Ametrine, Synthetic Quartz

Gemstone Groups

Key Separations

refractive index, birefringence, optic character and optic figure, lack of inclusions. Cobalt spectra on blue variety.

Comments

It often takes advanced laboratory tests to tell synthetic from natural quartz. The presence of Brazil-law twinning used to be proof of natural origin but this is no longer true unless it is the colorless variety.

Quartz (Synthetic) 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

blue: often appears pinkish

Pleochroism

Dichroic, unobservable to moderate, varying shades of body color

Dispersion

Strength: weak fire Value: 0.013

Comments

Quartz (Synthetic) Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

hydrothermal

Crystal System

Trigonal

Classification

Silicate

Nature

Synthetic

Crystallinity

Crystalline

Comments

Quartz (Synthetic) Characteristic Physical Properties

Hardness

7

Streak

White

Specific Gravity

2.64-2.69 Typical:2.66

Toughness

Good

Inclusions

Synthetic quartz is usually free of inclusions but some stones may show inclusions that resemble bread crumbs. Other possible inclusions are gas and liquid two phase nail head spicules and stain cracks. Color banding may be observed parallel to a seed plate as well as flame like twinning. The surface may also have a texture resembling cobblestones. Transparent pink quartz is rare in nature and the synthetic variety usually has eye-visible color banding. Unnatural blue color will be seen in blue synthetic quartz.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal

Cleavage

None

Comments

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