Jacobsite - Wikipedia
Jacobsite is a manganese iron oxide mineral. It is in the spinel group and forms a solid solution series with magnetite . The chemical formula is (Mn,Mg)Fe 2 O 4 or with oxidation states and substitutions: (Mn 2+ ,Fe 2+ ,Mg)(Fe 3+ ,Mn 3+ ) 2 O 4 .
Jacobsite: Mineral information, data and localities. - mindat.org
Jacobsite-Magnetite Series. Ferromagnetic. Often occurs in octahedral crystals. Jacobsite-Q is a polymorph of jacobsite. May be exomorphically ...
Jacobsite Mineral Data
A primary mineral or and alteration product of othe rmanganese-bearing minerals in some metamorphosed Mn deposits. Dimorphous with iwakiite and forms a series with magnetite. Jakobsberg, Sweden. Link to MinDat.org Location Data. Named after its locality. Comments: Sharp, octahedral crystals of Jacobsite on a bladed barite matrix.
Jacobsite (Mn2+,Fe2+,Mg)(Fe3+,Mn3+)2O4 c 2001-2005 Mineral Data Publishing, version 1 Crystal Data: Cubic. Point Group: 4/m32/m. Rarely in octahedral crystals, to 4 mm, which may exhibit exsolved hausmannite or galaxite; coarse to fine granular, massive. Twinning: On {111} as both twin and composition plane, the spinel law, flattened on {111 ...
Jacobsite (jac) - SpringerLink
2023年7月13日 · This Chapter describes Jacobsite (abbrv. jac), as seen with optical, reflected light microscopy. After summing up compositional data, main properties and optical parameters, the presentation follows a systematic scheme to facilitate consultation and …
Jacobsite | mineral | Britannica
manganese (Mn), chemical element, one of the silvery white, hard, brittle metals of Group 7 (VIIb) of the periodic table. It was recognized as an element in 1774 by the Swedish chemist Carl Wilhelm Scheele while working with the mineral pyrolusite and was isolated the same year by his associate, Johan Gottlieb Gahn.
Jacobsite - Franklin Mineral Information - FOMS
Jacobsite, a manganese ferric-iron oxide mineral of the spinel group, has been reported only rarely, but may have been overlooked; it might be more abundant than is presently known. Material of jacobsite composition (Mn2+ > Zn or Fe2+; Fe3+ > Mn3+) was first reported from Franklin by Frondel and Klein (1965) and subsequently by McSween (1976).
Jacobsite-Magnetite Series: Mineral information, data and localities.
Jacobsite-Magnetite Series mineral data, information about Jacobsite-Magnetite Series, its properties and worldwide locations.
Jacobsite - PubChem
Jacobsite is a mineral with formula of Mn 2+ Fe 3+ 2 O 4. The corresponding IMA (International Mineralogical Association) number is IMA1982 s.p.. The IMA symbol is Jcb.
Jacobsite, jac, is one of the ferric spinels, like magnetite or franklinite among others. They are characterized by forming solid solution at high temperature and, in addition, by very similar physical properties.
Mineral Database - Mineralogy of Wales - Museum Wales
jacobsite belongs to the spinel group of minerals and forms a series with magnetite (Fe 2+ Fe 3+2 O 4) and is dimorphous (having the same chemical composition but a different arrangement of the atoms) with iwakiite. Jacobsite is magnetic and is a constituent mineral in …
Jacobsite Definition & Meaning - Merriam-Webster
The meaning of JACOBSITE is a black magnetic isometric mineral MnFe2O4 consisting of an oxide of manganese and iron and constituting a member of the magnetite series.
JACOBSITE (Mn. 2+,Fe,Mg)(Fe. 3+,Mn ) 2. O. 4. An uncommon member of the spinel group found in some manganese-rich metamorphic iron ores. Northern Peninsula. Marquette County: Champion mine: In manganiferous quartz veins cutting Negaunee Iron Formation with “rhodonite” (pyroxmangite) and anhydrite. Confirmed by -ray diffraction X (Babcock ...
Jacobsite
Really sharp, bright to matte-finish jacobsite crystals to 2mm set in a vug in matrix from a famous location for jacobsite, Iron Knob, South Australia. Rare spinel group mineral. 2.5 x 2.1 x 1.9 cm © Rob Lavinsky & irocks.com
Jacobsite from the Tamworth district of New South Wales
2018年3月14日 · The jacobsite occurs as a constituent of small bodies of high-grade manganese ore at Weabonga, near Danglemah, and at the Mount Sally mine, about 6 miles west of Danglemah, both in the Tamworth district of New South Wales.
Jacobsite (jac): Mn2+Fe3+2O4: Cubic - ResearchGate
2023年7月13日 · This Chapter describes Jacobsite (abbrv. jac), as seen with optical, reflected light microscopy. After summing up compositional data, main properties and optical parameters, the presentation...
40 Facts About Jacobsite
2024年10月24日 · Jacobsite, a fascinating mineral, holds a special place in the world of geology. Known for its distinctive black color and metallic luster, this mineral is primarily composed of manganese, iron, and oxygen. Found in metamorphic rocks, jacobsite often forms in regions rich in …
Jacobsite | Thermoddem
As primary high temperature mineral but it secondary origin cannot be discarded. Occurs as a primary mineral or and alteration product of othe rmanganese-bearing minerals in some …
Jacobsite mineral information and data - dakotamatrix.com
Black crystal grains to 1mm of Jacobsite. Click thumbnail images for larger view. Jacobsite from N'Chwaning mines, Kuruman, Northern Cape prov., South Africa
Exomorphism of jacobsite precipitates in bixbyite single crystals …
2021年7月1日 · Electron nano-diffraction and atomic resolution (S)TEM imaging revealed these crystallites not to be bixbyite but jacobsite, a cubic iron-manganese spinel with the stoichiometric formula MnFe 2 O 4, whose occurrence in this unique context had not been reported before.
Applications of Raman Spectroscopy in Art and Archaeology
2 天之前 · The more complex black decorations on the surface could be divided into two types according to the Mn/Fe ratios and crystalline types: (1) low MnO 2 /Fe 2 O 3 ratio and jacobsite (FeMn 2 O 4) and magnetite (Fe 3 O 4) and (2) high MnO 2 /Fe 2 O 3 ratio and hausmannite (Mn 3 O 4). The former colour is brighter than the latter.
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