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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.



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.

References in periodicals archive ?
Analysis by Bart Cannon has shown that the crystals have slightly more than 4% MgO, and since any axinite with more than 3.
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.
Lustrous, faintly translucent, deep brown axinite crystals to 3 cm form subparallel clusters without matrix, with associated quartz and calcite, the latter partially etched away.