Elgoresyite (original) (raw)

A valid IMA mineral species

Specific Gravity:

4.315 (Calculated)

Crystal System:

Monoclinic

Name:

After Ahmed El Goresy (1935- October 3, 2019 Heidelberg), a highly regarded mineralogist working on planetary materials.

Elgoresyite exhibits the same crystal structure as the high-pressure iron oxide Fe7O9 stable at 24–26 GPa and 1873–1973 K.

Three sites are octahedrally coordinated and connected in a 3D network (M1, M2, and M3), while the fourth, M4, has a trigonal-prismatic geometry with an additional long bond with O2

Color, luster, streak, hardness, tenacity, cleavage, fracture, and density could not be determined because of the small grain size, and optical properties could also not be determined because of the small grain size.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:55377:5

e900ef64-3f16-40e7-a811-b1e4a7b17dcb

IMA Classification of ElgoresyiteHide

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Approval history:

IMA No. 2020-086

Classification of ElgoresyiteHide

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4.BB.

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
B : With only medium-sized cations

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of ElgoresyiteHide

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Density:

4.315 g/cm3 (Calculated)

Chemistry of ElgoresyiteHide

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Mindat Formula:

(Mg5Si2)O9

Crystallography of ElgoresyiteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 9.397(2) Å, b = 2.763(1) Å, c = 11.088(3) Å
β = 94.25(2)°

Ratio:

a:b:c = 3.401 : 1 : 4.013

Unit Cell V:

287.10 ų (Calculated from Unit Cell)

Type Occurrence of ElgoresyiteHide

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General Appearance of Type Material:

Unique grain in a shock-induced melt vein of the Suizhou meteorite. Suizhou L6 chondrite is a shocked meteorite with the occurrence of thin shock-induced melt veins less than 300 μm in thickness.

Place of Conservation of Type Material:

Mineralogical collections of the Museo di Storia Naturale, Università di Firenze, Via La Pira 4, I-50121, Firenze, Italy, catalogue number 3238/I.

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Synonyms of ElgoresyiteHide

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Related Minerals - Strunz-mindat GroupingHide

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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 ElgoresyiteHide

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References for ElgoresyiteHide

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Reference List:

Bindi, L., Sinmyo, R., Bykova, E., Ovsyannikov, S. V., McCammon, C., Kupenko, I., Ismailova, L., Dubrovinsky, L., Xie, X. (2021). Discovery of elgoresyite,(Mg, Fe) 5Si2O9: implications for novel iron-magnesium silicates in rocky planetary interiors. ACS Earth and Space Chemistry, 5(8), 2124-2130.

Localities for ElgoresyiteHide

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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.