Humite


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humite

[′hyü‚mīt]
(mineralogy)
A humic coal mineral.
A series of magnesium neosilicate minerals closely related in crystal structure and chemical composition.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Humite

 

a mineral of the silicate class, named for the English geologist and mineral collector A. Hume (1749–1838); in structure, isolated Si04 tetrahedrons with (OH) and F−1 anions attached. Chemical composition, Mg7 [Si04]3(F, OH)2. Humite crystallizes in a rhombic system, forming small dipyramidal crystals and amorphous colorless or honey-yellow grains. Hardness on the mineral scale, 6–6.5; density, 3,100–3,200 kg/m3. Humite is found as a relatively rare mineral in contact-marbled limestones.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Ti-clinohumite (low PHF), a mineral of the humite group, formed in forsterite marbles and may be stabilized by the presence of Ti (probably as a result of the formation of titanite reaction rims around rutile.
We believe they are a species belonging to the humite group, but we are not aware of any determinative work having been done on them.
In order to compare monoclinic members of the humite group with orthorhombic members, some mineralogists use a monoclinic unit cell which has its a and b parameters equivalent to the a and b parameters of the orthorhombic cell.
All four of the classic members of the humite group - humite, clinohumite, chondrodite and norbergite - are found at Monte Somma/Vesuvius.