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Purpurite is a manganese phosphate mineral with the formula MnPO 4, with varying amounts of iron depending upon its source. It occurs in color ranges from brownish black via purple and violet to dark red. [3] Purpurite forms a series with the iron-bearing endmember heterosite, FePO 4. [4]
Charoite (/ tʃ æ r oʊ. aɪ t / CHAR-ow-ait) is a rare silicate mineral with the chemical composition K(Ca,Na) 2 Si 4 O 10 (OH,F)•H 2 O, first described in 1978.It is named after the Chara River, despite its being 70 kilometres (43 mi) away from the discovery place.
Columbite, also called niobite, niobite-tantalite and columbate, with a general chemical formula of ( Fe II, Mn II) Nb 2 O 6, is a black mineral group that is an ore of niobium. It has a submetallic luster, a high density, and is a niobate of iron and manganese. Niobite has many applications in areospace, construction and the medical industry.
Babingtonite. Babingtonite is a calcium iron manganese inosilicate mineral with the formula Ca2(Fe,Mn)FeSi5O14(OH). It is unusual in that iron (III) completely replaces the aluminium so typical of silicate minerals. It is a very dark green to black translucent (in thin crystals or splinters) mineral crystallizing in the triclinic system with ...
Rhodochrosite is a manganese carbonate mineral with chemical composition MnCO 3. In its pure form (rare), it is typically a rose-red colour, [5] but it can also be shades of pink to pale brown. It streaks white, [6] and its Mohs hardness varies between 3.5 and 4.5. Its specific gravity is between 3.45 and 3.6. [7]
Spessartine is a nesosilicate, manganese aluminium garnet species, Mn 2+ 3 Al 2 (SiO 4) 3. This mineral is sometimes mistakenly referred to as spessartite.. Spessartine's name is a derivative of Spessart in Bavaria, Germany, the type locality of the mineral.
Umber is a natural brown pigment extracted from clay containing iron, manganese, and hydroxides. [ 11] Umber has diverse hues, ranging from yellow-brown to reddish-brown and even green-brown. The color shade varies depending on the proportions of the components. When heated, umber becomes a more intense color and can look almost black.
Axinite is a brown to violet-brown, or reddish-brown bladed group of minerals composed of calcium aluminium boro - silicate, (Ca,Fe,Mn)3Al2BO3Si4O12OH. Axinite is pyroelectric and piezoelectric . The axinite group includes: Axinite- (Fe) or ferroaxinite, Ca 2 Fe 2+ Al 2 BOSi 4 O 15 (OH) iron rich, clove-brown, brown, plum-blue, pearl-gray [4]
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