braunite


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braunite

A magnesium silicate with various metallic impurities.
References in periodicals archive ?
Most of the spots showed the presence of Hausmannite and Braunite (Figs.
These studies revealed the composition of Hausmannite and Braunite as major manganese minerals(Table-1).
The mineralogical studies of Bajaur Agency manganese deposits revealed the presence of Mn oxide and Mn silicate minerals comprising of Hausmannite and Braunite respectively.
Braunite occurs in good crystals in the manganese deposit at Ohrenstock near Ilmenau, in the Thuringian Forest about 100 km south of Ilfeld, but in the Ilfeld manganese veins it did not form good macrospecimens--lustrous crystals to 5 mm have been noted rarely, and braunite pseudomorphs after manganite occasionally have appeared (www.
P) Pyrolusite, Psilimelane Braunite manganite, Quartz, Feldspar 2.
It must be remembered that most of the orebody consists of massive braunite, and the minerals hosted in veins and cavities can be recovered much more easily from the broken ore brought out of the mine rather than in situ.
The same stratigraphic basal unit of the Monte Alpe Formation also includes the main manganese orebody, formed by braunite layers (Burckhardt and Falini, 1956).
Occurrence: In manganese ore consisting of braunite, rhodonite, spessartine, tinzenite, parsettensite, sursassite and strontian piemontite in radiolarites.
Associated minerals are: braunite, quartz, the "violan" variety of diopside-aegirine-jadeite, strontiopiemontite, hollandite, cryptomelane, jadeite, antimony-bearing titanite and arsenic-bearing titanite and arsenic-bearing fluorapatite.
Also found at the Wessels at the same time was braunite in small (never more than 5 mm) but sharp, brilliant black bipyramidal crystals, with calcite.
The matrix of the philolithite-bearing fissures is a calcite-rich Mn oxide ore, dominated by braunite with lesser amounts of hausmannite.
Occurrence: In a matrix consisting primarily of braunite, sugilite and hausmannite, cut by pectolite veinlets (0.