mineraloid


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mineraloid

[′min·rə‚lȯid]
(mineralogy)
A naturally occurring, inorganic material that is amorphous and is therefore not considered to be a mineral. Also known as gel mineral.
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References in periodicals archive ?
According to the literature, shungite is a mineraloid consisting of more than 98% carbon (Mastarlez et al., 2000).
In one way the organization here is conventional, the chapters moving in Dana order from native elements through tectosilicates, to end at last with opal, a non-crystalline "mineraloid." But there is much more history along the way.
Opal is actually a mineraloid, defined as an inorganic natural substance with uniform chemical composition but no internal crystal structure; "potch" is a synonym for "common," with connotations of "valueless." Discussions of opal quite often veer into definitions and sub-definitions and qualifications of terms, and much jargon rooted in opal's charisma and voluminous lore.
Another Derbyshire specialty in the collection is "Elastic Bitumen" from Castleton, including one huge lump of this intriguing mineraloid some 30 cm across.
Some mineralogists are reluctant to accept amorphous substances as mineral species because of the difficulty of determining whether the substance is a true chemical compound or a mixture, and the impossibility of characterizing it completely; the term mineraloid is sometimes applied to such substances.
Some mineralogists are reluctant to accept amorphous substances as minerals because of the difficulty in determining whether the substance is a true chemical compound or a mixture, and the impossibility of characterizing it completely; some prefer to call such substances "mineraloids." However, some amorphous substances (e.g.