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 Mineraloid - Definition 

A mineraloid is a mineral-like substance that does not demonstrate crystallinity. Mineraloids possess chemical compositions that vary beyond the generally accepted ranges for specific minerals. For example, obsidian is an amorphous glass and not a crystal. Jet is a dense form of coal. Opal is another mineraloid.

See also



pt:Mineralóide

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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Mineraloid".