- Source: Mineraloid
- Batu kalimaya
- Opalesens
- Geologi
- Padat
- Alterasi mineral
- Limonit
- Mineraloid
- Ozokerite
- Lechatelierite
- Hyalite
- Fiorite
- Jet (gemstone)
- Menilite
- Opalescence
- Opal
- Chrysocolla
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A mineraloid is a naturally occurring substance that resembles a mineral, but does not demonstrate the crystallinity of a mineral. Mineraloid substances possess chemical compositions that vary beyond the generally accepted ranges for specific minerals, for example, obsidian is an amorphous glass and not a true crystal; lignite (jet) is derived from the decay of wood under extreme pressure underground; and opal is a mineraloid substance because of its non-crystalline nature. Pearl is a mineraloid substance because the calcite crystals and the aragonite crystals are bonded by an organic material, and naturally occurs without definite proportions of the components.
The first usage of the term mineraloid substance was in 1909, by mineralogist and geologist Julian Niedzwiedzki, in identifying and describing amorphous substances that resemble minerals.
Examples
See also
List of minerals – Mineraloids are listed after minerals in each alphabetically sorted section.
References
External links
The Mineraloids Class. Amethyst Galleries.