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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:
  • Find Glass on www.crystalclassics.co.uk
  • Rare and Unusual minerals at Mineralogical Research Company
  • Lapis Mineral Magazin
  • Buy RARE Minerals from Rocks of Africa
  • Buy from McDougall Minerals
  • rare and unusual minerals mainly crystallized
  • Buy from David K Joyce minerals
  • The Arkenstone - Fine Minerals
  • Top quality minerals from Kristalle of California
  • Fine and rare minerals from mintreasure.com
  • Fine Minerals from Weinrich Minerals, Inc.
  • Wilensky Fine Minerals
  • Specimens:The following Glass specimens are currently listed for sale on minfind.com.
    Jobs:
  • 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.
    Current server date and time: February 23, 2014 08:49:03
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