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Glass

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System:AmorphousHardness:5 - 6½
Name:From the Celtic word glas (bluish-green)


An amorphous, homogeneous material with a random liquid-like structure generally formed due to rapid cooling.
Glasses can be natural (such as obsidian) or artificial (e.g., in slags). Artificial glasses are predominantly composed of silica with a few impurities.

Crystals in igneous rocks may contain tiny inclusions of frozen melt, i.e., glass.

In gemmology, man-made glasses have been used as gems since the discovery of glass, and special glass varieties, such as lead glass, containing additives have been used to simulate more valuable gemstones, such as diamond.

Visit gemdat.org for gemological information about Glass. Currently in public beta-test.

Classification of Glass

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Physical Properties of Glass

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent, Opaque
Hardness (Mohs):5 - 6½
Hardness Data:Measured
Fracture:Conchoidal

Crystallography of Glass

Crystal System:Amorphous

Optical Data of Glass

Type:Isotropic

Other Names for Glass

Synonyms:
Crystal Glass
Other Languages:
German:Glas
Simplified Chinese:玻璃
Varieties:
AndaraCommon GlassLead GlassMt St Helens Stone

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Glass

Search Engines:
  • Look for Glass on Google
  • Look for Glass images on Google
  • Mineral Dealers:
  • Buy from David K Joyce minerals
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Glass specimens for sale - minfind.com
  • Buy from Dave Bunk Minerals
  • Fine minerals from bisbeeborn.com
  • Fabre Minerals - search for Glass specimens
  • Fine and rare minerals from mintreasure.com
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Buy RARE Minerals from Rocks of Africa
  • Buy minerals from YourMineralCollection
  • Buy fine minerals and gemstones from Pala International
  • rare and unusual minerals mainly crystallized
  • Specimens:The following Glass specimens are currently listed for sale on minfind.com.

    Localities for Glass

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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