Mineraloid

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Mineraloid is the time period used for the ones materials that don’t match smartly into the sort of eight training. Opal, jet, amber, and mother of pearl all belong to the mineraloids.
Opal from Yowah, Queensland, Australia

Opal

Opal is classed a mineraloid, crystalline forms of silica, which are classed as minerals, unlike and hydrated amorphous form of silica (SiO2·nH2O); its water...

Obsidian

Obsidian is an igneous rock that forms when molten rock material cools so rapidly that atoms are unable to arrange themselves into a crystalline structure. It is an amorphous material known as a "mineraloid." The result is a volcanic glass with a smooth uniform texture that breaks with a conchoidal fracture .

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