johannsenite

johannsenite

       Pyroxenes silicate mineral in the pyroxene family. It has a molecular formula of Ca(Mn,Fe)Si2O6. A calcium-manganese-iron silicate mineral, johannsenite is produced either by metamorphic processes in altered limestones or is associated with pyrite or other minerals in copper, lead, and zinc ores. It is moderately hard, has a glassy lustre, and forms brown, gray, or green crystals or fibres. Common deposits are found in Arizona, New Mexico, and Oregon, U.S.; Italy; Japan; and New South Wales, Australia. For detailed physical properties, see pyroxene (table (Pyroxenes)).

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Universalium. 2010.

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  • johannsenite — jo·hann·sen·ite …   English syllables

  • johannsenite — jōˈhan(t)səˌnīt noun ( s) Etymology: Albert Johannsen died 1950 American geologist + English ite : a mineral CaMnSi2O6 consisting of a silicate of calcium and manganese belonging to the pyroxene group …   Useful english dictionary

  • pyroxene — pyroxenic /puy rok sen ik/, adj. /puy rok seen, peuh , puy rok seen /, n. any of a very common group of minerals of many varieties, silicates of magnesium, iron, calcium, and other elements, occurring as important constituents of many kinds of… …   Universalium

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  • Pyroxenes — ▪ Table Pyroxenes name colour lustre Mohs hardness specific gravity aegirine green to greenish black vitreous 6 3.4–3.6 augite brown; green; black vitreous 5 1/2–6 3.2–3.5 diopside white, pale to dark green (diopside); brownish green, dark green …   Universalium

  • Pyroxene — Figure 1: A sample of pyroxenite, a rock consisting mostly of pyroxene minerals. The pyroxenes are a group of important rock forming inosilicate minerals found in many igneous and metamorphic rocks. They share a common structure consisting of… …   Wikipedia

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