Axinite


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axinite

[′ak·sə‚nīt]
(mineralogy)
H2(Ca,Fe,Mn)4(BO)Al2(SiO4)5 Brown, blue, green, gray, or purplish gem mineral that commonly forms glassy triclinic crystals. Also known as glass schorl.
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 It might be outdated or ideologically biased.

Axinite

 

a mineral, alumoborosilicate of calcium, iron, and manganese. Depending on the ratio of Fe2+ and Mn2+ present, the mineral is classified as “ferroaxinite,” “severge-nite,” or “manganosevergenite.” Axinite crystallizes in a triclinic system, and usually appears in the form of broad crystals with sharp points. Its hardness on the mineralogical scale is 6.5–7.0; its density is 3,250–3,300 kg/m3. Its color is mostly brown, often with a bluish or violet tint. Axinite is commonly found in close association with the ores of iron, copper, tin, and manganese and also with complex ores. The composition of axinite corresponds to the particular mineral paragenesis: manganous axinites accompany tin and polymetallic mineralization, while ferruginous axinites are characteristic of copper and iron deposits.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The Puiva deposit, more mineralogically complex than its sister, the nearby Dodo deposit, occasionally has yielded specimens showing sharp, pale pink octahedral fluorite crystals to 1.5 cm associated with well crystallized apophyllite and axinite. Puiva fluorite specimens generally do not appear at U.S.
Analysis by Bart Cannon has shown that the crystals have slightly more than 4% MgO, and since any axinite with more than 3.6% MgO qualifies as axinite-(Mg), the California specimens are, for sure, representatives of this rare member of the axinite group.
The Fano experience was the start of a series of successes: Cahuila Mountain in 1981 for beryl, tourmaline, axinite and quartz; the Collier Creek mine in Arkansas for quartz and wavellite; and the Black and Blue mine in 1988 in Harris Park, Colorado for amazonite, smoky quartz and topaz.
(1939) described amygdules and geodes in the capping basalts, containing axinite, calcite, danburite, datolite, fluorite, goethite, hematite, pyrite, quartz, schorl and specular hematite.
Excellent miniature and small cabinet-size specimens of "axinite" (probably the species ferro-axinite) have very recently begun to emerge from a locality designated as either Mian Ning, Sichuan province or Nandan City, Guangxi province.
Axinite Group (Ca,Mn,Fe,Mg)[.sub.3][Al.sub.2]B[Si.sub.4][O.sub.15](OH)