Aventurine Quartz | Gemopedia

Aventurine is a form of quartz, distinguished by its translucent to opaque appearance and the presence of mineral inclusions that give a shimmering or glittery effect termed aventurescence. The phenomenon of aventurescence is caused by small leaf-like or plate-like inclusions, usually mica, distributed throughout the host material. Light striking the surface of these inclusions is reflected back to the viewer, creating an eye-catching sparkle. While customarily green in color, aventurine may also be found in colors ranging from blue, orange, white, yellow, reddish-brown to gray.
Alternate
Names
Aventurine
Colors
Green, Gray, Yellow, Brown

Aventurine Quartz Classification

Common Name

Aventurine Quartz

Species

NA

Variety

Colors

Green, Gray, Yellow, Brown

Alternate Names

Aventurine

Gemstone Groups

Key Separations

Appearance, RI and magnification.

Comments

Misnomer: Indian Jade for green variety. Aventurine quartz is quartzite that shows aventurescence.

Aventurine Quartz Optical Properties

Transparency

Translucent - Opaque

Refractive Index

1.544-1.553
Tolerance:very constant

Birefringence

0.009

Optic Character

Optic Sign

Polariscope Reaction

Aggregate (AGG)

Fluorescence

SWUV: Inert to weak grayish green or reddish
LWUV: Inert to weak grayish green or reddish

CCF Reaction

Pleochroism

None

Dispersion

Comments

Aventurine Quartz Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Aggregate

Comments

Aventurine Quartz Characteristic Physical Properties

Hardness

7

Streak

White

Specific Gravity

2.64-2.69 Typical:2.66

Toughness

Good

Inclusions

Aventurine quartz will have green disk-like chrome-mica fuchsite flakes or platlets that can be seen with magnification.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal, Granular

Cleavage

None

Comments

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