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|System:||Amorphous||Hardness:||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|
Crystallography of Glass
Optical Data of Glass
Other Names for Glass
|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
|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.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: Challenge deposit, Emerald Lake Hills, San Mateo Co., California, USAFrom Brent Thorne, 7th Dec 2013 23:31:03