Mineraloid
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A mineraloid is a naturally occurring
Jet is derived from decaying wood under extreme pressure. Opal is another mineraloid because of its non-crystalline nature. Pearl is considered a mineraloid because the included calcite and/or aragonite
crystals are bonded by an organic material, and there is no definite proportion of the components.
The term was first introduced in 1909 by mineralogist and geologist Julian Niedzwiedzki, in reference to amorphous substances resembling minerals.[1]
Examples
- Allophane, solid (IMA/CNMNC valid mineral name)
- Amber, non-crystalline structure, organic
- Anthracite or hard coal
- Bituminous coal
- Chlorophaeite[2]
- Chrysocolla, solid (IMA/CNMNC valid mineral name)
- Deweylite, a mixture of serpentine and talc or stevensite[3]
- Diatomite
- Ebonite,[citation needed] vulcanized natural or synthetic rubber (organic); lacks a crystalline structure
- Fulgurite, a variety of the mineraloid lechatelierite
- Jet, non-crystalline nature, organic (very compact coal)
- Lechatelierite, nearly pure silica glass, solid (IMA/CNMNC valid mineral name)
- Leonardite
- Libyan desert glass
- Lignite—brown coal
- Limonite, a mixture of oxides and hydroxides of iron
- Mercury, (as liquid)
- Moldavite
- Mookaite/Radiolarite
- Obsidian—volcanic glass; non-crystalline structure, a silica rich glass
- Opal, non-crystalline hydrated silica silicon dioxide, solid (IMA/CNMNC valid mineral name)
- Ozokerite, a black waxy hydrocarbon mixture
- Palagonite[2]
- Pearl, organically produced carbonate
- Pele's hair
- Petroleum, liquid, organic
- Psilomelane
- Pumice
- Pyrobitumen, amorphous fossilized petroleum (noncrystalline, organic)
- Shungite, black, lustrous, more than 98 weight percent of carbon
- Sideromelane,[2] volcanic glass – non-crystalline, an iron rich, silica poor glass
- Tektite, meteoritic silica rich glass
- Water, e.g. as inclusions in other crystals, or in the form of rain, (as liquid)
- Zietrisikite, a mineral hydrocarbon wax
See also
- List of minerals – Mineraloids are listed after minerals in each alphabetically sorted section.
References
- .
- ^ a b c Peacock, M. A.; Fuller, R. E. (1928). "Chlorophaeite, sideromelane, and palagonite from the Columbia River Plateau" (PDF). American Mineralogist. 13: 360–382. Retrieved 6 September 2017.
- ISSN 1096-7451.
External links
- The Mineraloids Class. Amethyst Galleries.
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