Moldavite | Gemopedia

Considered a blend of heaven and earth, tektites are fragments of natural glass formed from meteorite impacts with our planet. Tektites are assigned names based on their location. Thus, moldavite, named after the Moldau river in the Czech Republic, is found in that country. The intense pressure and temperatures present during its formation preserve tiny gaseous bubbles in many moldavite gems.
Alternate
Names
Bouteille Stone
Colors
Medium To Dark Yellowish To Grayish Green

Moldavite Classification

Common Name

Moldavite

Species

Tektite

Variety

Moldavite

Colors

Medium To Dark Yellowish To Grayish Green

Alternate Names

Bouteille Stone

Gemstone Groups

Key Separations

refractive index, SR nature, magnification, and specific gravity

Comments

Moldavite is a type of natural glass. In some classification schemes, moldavite is considered a species without reference to tektite. Tektite is a general term used for natural glasses formed by meteoric impacts. Misnomers: Bohemian chrysolite, false chrysolite, glass chrysolite, glass metorite, pseudochrysolite

Moldavite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.49-1.49
Tolerance:(+0.020/-0.010)

Birefringence

0-0

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Singly Refractive (SR) With ADR

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

None

Dispersion

Comments

Moldavite Chemistry & Crystallography

Chemical Name

silica

Chemical Formula

SiO2 (+A2O3)

Synthesis

Crystal System

NA

Classification

Mineraloid

Nature

Natural

Crystallinity

Non-Crystalline

Comments

Moldavite Characteristic Physical Properties

Hardness

5-5.5

Streak

Specific Gravity

2.32-2.4 Range:+/-0.04 Typical:2.36

Toughness

Varies

Inclusions

Moldavite often has round and elongated gas bubbles, flow lines and a roiled, cloudy or turbid appearance.

Luster

Vitreous

Stability

Fracture

Conchoidal

Cleavage

None

Comments

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