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Mineraloid is described in multiple online sources, as addition to our editors' articles, see section below for printable documents, Mineraloid books and related discussion.

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Fire Opal (SiO 2·nH 2O) is actually not technically a mineral but instead is a mineraloid. The reason being opal does not have a crystal structure that is required for all minerals.
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From Melissa Joy Manning's gradated drop earrings to Brooke Gregson's gold bezelled opal pendants, after millions of years in the making, the mineraloid is finally having its moment.
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In the world of jewelry, opal inhabits a space reserved for few gems. It is classified as a “mineraloid” because it lacks crystal in its mineral makeup. It doesn't sparkle or glitter, like most gemstones.

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