Mineraloid mineraloid is a naturally occurring 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 of its non-crystalline nature. Pearl contains calcium carbonate crystals within its structure, but it should be considered a mineraloid because the crystals are bonded by an organic material , and there is no definite proportion of the components.Examples Allophane Amber , non-crystalline structure, organic Chlorophaeite Chrysocolla Deweylite , a mixture of serpentine and talc or stevensite Diamtomite Ebonite , vulcanized natural or synthetic rubber ; lacks a crystalline structure Jet, non-crystalline nature, organic Lechatelierite , nearly pure silica glass Leonardite Libyan desert glass Limonite , a mixture of oxides and hydroxides of iron Mercury , Moldavite Obsidian , volcanic glass – non-crystalline structure, a silica rich glass Opal, non-crystalline hydrated silica silicon dioxide Palagonite Pearl, organically produced carbonate Pele's Hair Petroleum , liquid, organic Psilomelane Pumice Pyrobitumen , amorphous fossilized petroleum Radiolarite Sideromelane , volcanic glass – non-crystalline, an iron rich, silica poor glass Shungite , black, lustrous , more than 98 weight per cent of carbon Tektites , meteoritic silica rich glass Water
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