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BISMUTHITE

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Originally appearing in Volume V04, Page 11 of the 1911 Encyclopedia Britannica.
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BISMUTHITE , a somewhat rare See also:

mineral, consisting of See also:bismuth trisulphide, Bi2Ss. It crystallizes in the orthorhombic See also:system and is isomorphous with See also:stibnite (Sb2S3), which it closely resembles in See also:appearance. It forms loose interlacing aggregates of acicular crystals without terminal faces (only in a single instance has a terminated crystal been observed), or as masses with a foliated or fibrous structure. An important See also:character is the perfect. cleavage in one direction parallel to the length of the needles. The See also:colour is See also:lead-See also:grey inclining to See also:tin-See also:white and often with a yellowish or iridescent tarnish. The hardness is 2; specific gravity 6.4-6.5. Bismuthite occurs at several localities in See also:Cornwall aatd See also:Bolivia, often in association with native bismuth, and tin-ores. Other localities are known; for instance, See also:Brandy Gill in Caldbeck Fells, See also:Cumberland, where with See also:molybdenite and See also:apatite it is embedded in white See also:quartz. The mineral was known to A. Cronstedt in 1758, and was named bisrnuthine by F. S. See also:Beudant in 1832.

This name, which is also used in the formsi bismuthite and bismuthinite, is rather unfortunate, since it is. readily confused with bismite (bismuth See also:

oxide) and bismutite' (basic bismuth' carbonate), especially as the latter has also been, used in the See also:form bismuthite. The name bismuth-glance or bismutholamprite for the See also:species under See also:consideration is See also:free from this objection. (L. J.

End of Article: BISMUTHITE

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