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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

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

Crystallography of Glass

Crystal System:Amorphous

Optical Data of Glass


Other Names for Glass

Crystal Glass
Other Languages:
Simplified Chinese:玻璃
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 minerals from YourMineralCollection
  • Fine Minerals from Weinrich Minerals, Inc.
  • Lapis Mineral Magazin
  • Buy RARE Minerals from Rocks of Africa
  • Buy rare minerals from Excalibur Minerals
  • Buy from David K Joyce minerals
  • Search for Glass on Well-Arranged Molecules
  • Glass specimens for sale - minfind.com
  • Wilensky Fine Minerals
  • Find Glass on www.crystalclassics.co.uk
  • High-end worldwide specimens & outstanding customer service
  • The Arkenstone - Fine Minerals
  • Specimens:The following Glass specimens are currently listed for sale on minfind.com.
  • Mining & Geology Jobs
  • Localities for Glass

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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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