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DUMORTIERITE

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Originally appearing in Volume V08, Page 667 of the 1911 Encyclopedia Britannica.
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DUMORTIERITE , a See also:

mineral described in 1881 by M. F. Gonnard, who named it after See also:Eugene Dumortier, a palaeontologist of See also:Lyons, See also:France. It is essentially a basic See also:aluminium borosilicate, belonging to the orthorhombic See also:system; it occurs usually in fibrous forms, of smalt-See also:blue, greenish-blue, See also:lavender or almost See also:black See also:colour, and exhibits strong pleochroism. According to W. T. Schaller (Amer. Journ. Sci., 1905 (iv.), 19, p. 211) a See also:purple colour may be due to the presence of See also:titanium. Analyses of some specimens point to the See also:formula (SiO4)3Al(AlO)7(BO)H, which, written in this See also:form, explains the See also:analogy with See also:andalusite and the alteration into See also:muscovite. Dumortierite occurs in See also:gneiss at Chaponost, near Lyons, and at a few other See also:European localities; it is found also in the See also:United States, being known from near New See also:York See also:City, from See also:Riverside and See also:San Diego counties, See also:California, and from Yuma See also:county, See also:Arizona.

The last-named locality yields the mineral in some quantity in the form of dense See also:

fibres embedded in See also:quartz, to which it imparts a blue colour. The mineral aggregate is polished as an ornamental See also:stone, rather resembling lapis-lazuli.

End of Article: DUMORTIERITE

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