braunite


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braunite

(ˈbraʊnaɪt)
n
(Minerals) a brown or black mineral that consists of manganese oxide and silicate and is a source of manganese. Formula: 3Mn2O3.MnSiO3
[C19: named after A. E. Braun (1809–56), German official in the treasury at Gotha]
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Manganese is found as braunite, pyrolusite, psilomelane, and rhodochrosite.
Besides Hausmannite Braunite occurs in these samples and can be distinguished from the former by the presence of birefringence and pleochroism.
The manganese ore species of the veins are braunite, hausmannite, cryptomelane, "wad" and most commonly, and of greatest economic significance, pyrolusite and manganite.
Mineralogical composition of the fines at Balaghat and Ukwa mines is similar in nature and consists of Hollandite, Braunite, Psilomelane, Hematite, Apatite and Quartz.
Manganese minerals predominate over iron (hematite) and include pyrolusite, psilomelane/cryptomelane, hausmanite, and braunite.
2), a large tabular body of fault breccia is composed of felsic rock cemented by manganese oxides and containing massive botryoidal psilomelane and braunite, as well as crystals and needles of manganite in rugs with barite.
Mineralogically, the manganese ores are mainly composed of braunite with subordinate amount of hematite in the fine-grained quartz matrix.
the Cervandone area with its rare, often arsenic-bearing minerals such as cafarsite, gasparite-(Ce), tilasite, chernovite-(Y), cervandonite-(Ce), asbecasite, and paraniite-(Y); the Simplon tunnel; the Pestarena gold mine (one of the main sources of gold in Western Europe at the beginning of the 20th century); the Brosso and Traversella mines; the Candoglia quarries, source of the marble used to build the famous Milan cathedral and type locality of paracelsian, taramellite and wenkite; the pyrope-coesite-quartzite outcrops of Dora-Maira massif, source of six IMA-approved new species; and the eclogitized manganese deposit of Prabornaz (Praborna), type locality for braunite, piemontite, romeite, strontiomelane, and manganiandrosite-(Ce).
Lately Charlie has been supervising specimen-prospecting in South Africa's famed Wessels manganese mine, with some impressive results which Rob Lavinsky of The Arkenstone had in his booth at Denver: a single flat (so far) of what are surely the finest specimens of the manganese silicate braunite ever found in the Wessels mine or, for that matter, anywhere.
The type material came from a pocket in massive braunite and hausmannite and was associated with henritermierite, calcite, bultfonteinite and hematite.
Fengjiashan Hubei amethyst, apophyllite, braunite, calcite, chalcopyrite, datolite, hubeite, ilvaite, inesite, japanese twins, pyrite, stilbite/stellarite, wollastonite Fenglin Jiangxi chalcocite Fengsandong Hubei amethyst, bornite, apophyllite, chalcopyrite, datolite, inesite, molybdenite, pyrite, parsettensite, stilbite Fushan Hebei vesuvianite, hematite Fushun Liaoning amber Fuyun Xinjiang, aquamarine, fluorite, garnet, hiddennite, Uygur A.
Associated minerals are: serandite-pectolite and braunite.