Mesitite

Mesitite
Mesitite (from — middle, between), formerly better known as ''mesitine spar'',
a synonym of Mesitine Spar: information about the mineral Mesitite in the database Mindat. ''ferrous

magnesite

'' or ''

brown spar

'' is a

variety

of magnesite, a

carbonate mineral

, one of the so-called brown spars, regarded as an iron-bearing variety of magnesite or, in other cases,
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Brown Spar
Brown spar or ''brown-spar'' ()''Krivovichev V. G.'' Mineralogical glossary. Scientific editor :uk:Булах Андрій Глібович, A. G. Bulakh. — St.Petersburg: St.Petersburg Univ. Publ. House. 2009. — 556 p. — ISBN 978-5-288-04863-0 is a trivial name, trivial, partly obsolete name for at least ''four'' carbonate minerals that are relatively similar in composition: ankerite, Dolomite (mineral), dolomite (with varieties), magnesite (with varieties) and siderite,Bulletin of the United States National Museum. No.30. Published under the Directions of the Smithsonian Institution. — Washington: Government Printing Office, 1885. which have a characteristic dirty-brown hue due to the content of iron compounds, as well as an admixture of manganese oxide. As a consequence, many varieties of Dolomite (mineral), dolomite, colored brown or grey-brown by impurities, are also known as ''brown spar''. The name brown spar is both capacious and vividly descriptive, referring exclu ...
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