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.

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.

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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.
Ti-clinohumite in the Cienaga skarn-type mineralogy, Sierra Nevada de Santa Marta Massif (Colombia): occurrence and petrologic significance
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.
ABSTRACTS OF NEW MINERAL DESCRIPTIONS
Although the associations placed the tentative identification of humite in question, no further work was done due to paucity of material.
Monazite-(Ce) from the Buckwheat dolomite at Franklin, New Jersey

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