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AXINITE

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Originally appearing in Volume V03, Page 68 of the 1911 Encyclopedia Britannica.
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AXINITE , a See also:

mineral consisting of a complex See also:aluminium and See also:calcium boro-silicate with a small amount of basic See also:hydrogen; the calcium is partly replaced in varying amounts by ferrous See also:iron and See also:manganese, and the aluminium by ferric iron: the See also:formula is HCa3BAl2(SiO4)4. The mineral was named (from &eivrg an See also:axe) by R. J. flatly in 1799, on See also:account of the See also:char- acteristic thin See also:wedge-like See also:form of its anorthic crystals. The See also:colour is usually clove-See also:brown, but rarely it has a See also:violet tinge (on this account the mineral was named yanolite, meaning violet See also:stone, by J. C. Delametherie in 1792). The best specimens are afforded by the beautifully See also:developed transparent glassy crystals, found with See also:albite, See also:prehnite and See also:quartz, in a See also:zone of See also:amphibolite and See also:chlorite-See also:schists at Le Bourg d'Oisans in See also:Dauphine. It is found in the greenstone and See also:hornblende-schists of Batallack See also:Head near St Just in See also:Cornwall, and in See also:diabase in the Harz; and small ones in See also:Maine and in See also:Northampton See also:county, See also:Pennsylvania, U.S.A. Large crystals have also been found in See also:Japan. In its occurrence in basic rather than in See also:acid eruptive rocks, axinite differs from the boro-silicate See also:tourmaline, which is usually found in See also:granite. The specific gravity is 3.28. The hardness of 62-7, combined with the colour and transparency, renders axinite applicable for use as a See also:gem-stone, the Dauphine crystals being occasionally cut for this purpose.

(L. J.

End of Article: AXINITE

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