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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.[1]
^Titamgim, Dirk (1988). "Rock Chips: What is a Mineraloid?". Rocks & Minerals. 63 (1): 65. doi:10.1080/00357529.1988.11761818.
A mineraloid is a naturally occurring substance that resembles a mineral, but does not demonstrate the crystallinity of a mineral. Mineraloid substances...
cleavage, it has a conchoidal fracture. The transparent or translucent mineraloid has a globular structure, a vitreous luster, and a white streak. Hyalite...
amorphous SiO2, non-crystalline mineraloid. It is named for Henry Louis Le Chatelier. Lechatelierite is a mineraloid as it does not have a crystal structure...
Opalescence or play of color is the optical phenomenon displayed by the mineraloid gemstone opal, a hydrated silicon dioxide. Each of the three notable types...
and crystalline structure, it is not considered a mineral but only a mineraloid. The name was coined from Greek elements Όζω ozο, to stink, and κηρός...
mineraloid, a form of opal, found in cavities in volcanic tuff. It is a globular, botryoidal, or stalactic concretionary form of opal. The mineraloid...
Menilite is a greyish-brown form of the mineraloid opal. It is also known as liver opal or leberopal (German), due to its color. It is called menilite...
between 6% and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. It...
(/ˌkrɪsəˈkɒlə/ KRIS-ə-KOL-ə) is a hydrous copper phyllosilicate mineral and mineraloid with the formula Cu 2 – xAl x(H 2Si 2O 5)(OH) 4⋅nH 2O (x < 1) or (Cu,...
silica in cryptocrystalline form in agate and jasper, or as the amorphous mineraloid opal. Aside from their use in jewelry, scientists can use this type of...
silicate clay mineraloid. Its chemical formula is Al2O3·(SiO2)1.3-2·(2.5-3)H2O. Since it has short-range atomic order, it is a mineraloid, rather than...
and mineralogy, a mineral variety is a subset of a mineral species or mineraloid with some special characteristic, such as specific impurities or structural...
variable to be classified as a mineral. It is sometimes classified as a mineraloid. Though obsidian is usually dark in color, similar to mafic rocks such...
Leonardite is a soft waxy, black or brown, shiny, vitreous mineraloid that is easily soluble in alkaline solutions. It is an oxidation product of lignite...
color jet, also called jet black, is a representation of the color of the mineraloid jet. The first recorded use of jet as a color name in English was in 1450...
leading to some confusion. In scientific usage, shungite refers to a mineraloid which contains >98% carbon, and is used as a modifier to the host-rock's...
crystalline mineral stibnite and the amorphous red mineral (actually a mineraloid) metastibnite. It is manufactured for use in safety matches, military...
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