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MISPICKEL

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Originally appearing in Volume V18, Page 579 of the 1911 Encyclopedia Britannica.
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MISPICKEL , a See also:

mineral consisting of See also:iron sulpharsenide, FeAsS; it contains 46% of See also:arsenic, and is of importance as anore of this See also:element. It is known also as arsenopyrite or arsenical See also:pyrites (Ger. Arsenikkies) : mispickel is an old name of See also:German origin, and in the See also:form Mistpuckel was used by G. See also:Agricola in 1546. The crystals are orthorhombic, with angles similar to those of See also:marcasite; they are often prismatic in See also:habit, and the See also:prism M is usually terminated by the deeply striated faces of an obtuse See also:dome r. Twinning is not uncommon, the twin- planes. M (no) and g (1o1) being the same as in marcasite. The See also:colour of the mineral is See also:silver-See also:white or See also:steel-See also:grey, with a metallic lustre, but it is often tarnished yellow; the streak is greyish-See also:black. The hardness is 51-6, and the specific gravity 5.9–6.2. Mispickel occurs in metalliferous See also:veins with ores of See also:tin, See also:copper, silver, &c. It is occasionally found as embedded crystals, for example, in See also:serpentine at Reichenstein, See also:Silesia. In See also:Cornwall and See also:Devon it is associated with cassiterite in the tin-lodes, but is also found in the copper-lodes: well crystallized specimens have been obtained from the neighbourhood of See also:Tavistock, See also:Redruth and St See also:Agnes.

Mispickel is the See also:

principal source of arsenious See also:oxide or the " white arsenic " of See also:commerce (see ARSENIC). The See also:chief supplies are from Cornwall and Devon, and See also:Freiberg in See also:Saxony, and from See also:Canada and the See also:United States. Danaite is a cobaltiferous variety of mispickel, containing up to 9% of See also:cobalt replacing iron; it was first noticed by J. F. See also:Dana in 1824 at See also:Franconia in New See also:Hampshire. This variety forms a passage to the See also:species glaucodote, (Co,Fe)See also:AsS, which is found as well-See also:developed orthorhombic crystals in copper ore at Hakansboda in Ramberg See also:parish, Vestmanland, See also:Sweden. Other species belonging to this isomorphous See also:group of orthorhombic minerals are marcasite (FeS2), lollingite (FeAs2), safflorite (CoAs2) and rammelsbergite (NiAs2). (L. J.

End of Article: MISPICKEL

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