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 derived from decaying wood under extreme pressure. Opal is another mineraloid because...
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http://en.wikipedia.org/wiki/Mineraloid
A naturally occurring, usually inorganic, solid consisting of either a single element or a compound, and having a definite chemical composition but lacking a systemic internal arrangement of atoms. Opal and Obsidian are two examples.
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http://www.encyclo.co.uk/local/22291
mineraloid 1. A naturally occurring, usually inorganic, mineral-like material that is amorphous and lacks a highly ordered atomic arrangement and characteristic external form; such as, opal or volcanic glass. 2. A metallic element in liquid form; such as, mercury at ordinary temperatures.
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http://www.wordinfo.info/words/index/info/view_unit/4267/
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