Jacobsite-Q (original) (raw)

A material that is NOT an approved mineral species

About Jacobsite-QHide

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Formula:

Mn2+(Fe3+,Mn3+)2O4

From Bosi et al. (2018); type material has Fe3+:Mn3+ = 2:1.

Colour:

Greenish black, black

Lustre:

Sub-Vitreous, Metallic, Sub-Metallic

Crystal System:

Tetragonal

A polymorph of jacobsite, termed jacobsite-Q, earlier named iwakiite.
Contains significant octahedrally coordinated Mn3+ distorting the crystal structure to tetragonal.

See also α-vredenburgite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2058:5

e6f09c7f-baca-4fa9-be21-852534674d74

IMA Classification of Jacobsite-QHide

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IMA status notes:

Redefined by the IMA, Renamed by the IMA

Approval history:

First described as iwakiite by Matsurbara et al. (1979). Redefined as the tetragonal polymorph of jacobsite and renamed as jacobsite-Q by IMA 2018 (Bosi et al. 2018).

Classification of Jacobsite-QHide

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7.2.6.2

7 : MULTIPLE OXIDES
2 : AB2X4

7.9.14

7 : Oxides and Hydroxides
9 : Oxides of Ti

Physical Properties of Jacobsite-QHide

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Sub-Vitreous, Metallic, Sub-Metallic

Colour:

Greenish black, black

Comment:

May look completely black, may be iridescent due to surface alteration.

Cleavage:

None Observed
None

Fracture:

Conchoidal, Sub-Conchoidal

Density:

4.85 g/cm3 (Measured) 4.89 g/cm3 (Calculated)

Optical Data of Jacobsite-QHide

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Reflectivity:

Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 20 20.0 19.4440 19.9 19.3460 20.3 19.5480 20.4 19.6500 20.8 19.8520 21.2 20.1540 21.4 20.3560 21.3 20.4580 21.2 20.1600 21.0 20.0620 20.9 19.7640 20.5 19.6660 20.4 19.2680 20.2 19.1%.

Colour in reflected light:

olive-gray

Internal Reflections:

none observed

Pleochroism:

Non-pleochroic

Chemistry of Jacobsite-QHide

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Mindat Formula:

Mn2+(Fe3+,Mn3+)2O4

From Bosi et al. (2018); type material has Fe3+:Mn3+ = 2:1.

Crystallography of Jacobsite-QHide

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Crystal System:

Tetragonal

Class (H-M):

4/m m m _(_4/_m_2/_m_2/m ) - Ditetragonal Dipyramidal

Cell Parameters:

a = 6.025 Å, c = 8.54 Å

Unit Cell V:

310.01 ų (Calculated from Unit Cell)

Morphology:

Rarely octahedral, usually granular

Twinning:

{101}, similar to hausmannite

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0010983	Jacobsite-Q	Jarosch D (1988) Crystal structure of iwakiite Zeitschrift fur Kristallographie 185 605-605		1988	Gozaisho mine, Fukushima Prefecture, Japan	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Satoshi MATSUBARA, Akira KATO, Kozo NAGASHIMA (1978) Mineralogical Magazine, v9, pp.383-391.

First Recorded Occurrence of Jacobsite-QHide

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Associated Minerals at First Recorded Locality:

Synonyms of Jacobsite-QHide

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Other Language Names for Jacobsite-QHide

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Relationship of Jacobsite-Q to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Fluorescence of Jacobsite-QHide

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Other InformationHide

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Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Jacobsite-QHide

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References for Jacobsite-QHide

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Reference List:

Matsubara, Satoshi, Kato, Akira, Nagashima, Kozo (1979) Iwakiite, Mn2+(Fe3+,Mn3+)2O4, a new tetragonal spinelloid mineral from the Gozaisho mine, Fukushima Prefecture, Japan. Mineralogical Journal, 9 (7) 383-391 doi:10.2465/minerj.9.383

Localities for Jacobsite-QHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.