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Unnamed (Magnesium (Iron Calcium) Trisilicate)

Valid as an unnamed mineral
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Formula:
(Mg,Fe,Ca)4Si3O10
structural formula: (Mg,Fe,Ca,Si,◻)2SiO4
Crystal System:
Tetragonal
An UHP shock-related spinelloid phase. Possibly a member of the oxyspinel group (more specifically: the ulvöspinel subgroup).

As irregular to subhedral crystals, ca. 1-3 microns in diameter, in a melt pocket surrounded by ahrensite, bridgmanite and wüstite.

Corresponds to a HT-HP vacancy-stabilized silicate spinel of the ringwoodite-Q-II type; structurally related to ringwoodite-Q and ahrensite-Q.

The composition is derived from 50% olivine (forsterite) and 50% pyroxene molecules.


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Unique IdentifiersHide

Mindat ID:
470822
Long-form identifier:
mindat:1:1:470822:9
GUID
(UUID V4):
baaa1bb3-a814-46d7-b93d-eb12de748082

IMA Classification of Unnamed (Magnesium (Iron Calcium) Trisilicate)Hide

IMA status notes:
Unnamed (probably valid)

Chemistry of Unnamed (Magnesium (Iron Calcium) Trisilicate)Hide

Mindat Formula:
(Mg,Fe,Ca)4Si3O10

structural formula: (Mg,Fe,Ca,Si,◻)2SiO4
Elements listed:
Ca, Fe, Mg, O, Si - search for minerals with similar chemistry

Chemical AnalysisHide

Oxide wt%:
 1
SiO243.68 %
FeO28.07 %
MgO17.44 %
CaO6.40 %
Al2O33.03 %
MnO0.62 %
Na2O0.50 %
TiO20.28 %
Cr2O30.25 %
Total100.26 %
Total:200.53 %
Empirical formulas:
Sample IDEmpirical Formula
1(Mg1.72Fe1.56Ca0.45Na0.06Mn0.03Cr0.01Ti0.01)(Si2.90Al0.24Ti0.01)O10
Sample references:
IDLocalityReferenceNotes
1Tissint Martian meteorite, Tata Cercle, Tata Province, Souss-Massa Region, Morocco
Ma, C. (2023): Discovery of a new high-pressure silicate, (Mg,Fe,Ca)4Si3O10, with a spinelloid structure, in a shock melt pocket from the Tissint martian meteorite. Meteoritics & Planetary Science, 58, 6257.
by EPMA-WDS; empirical formula basis: 10 oxygen apfu

Crystallography of Unnamed (Magnesium (Iron Calcium) Trisilicate)Hide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
I41/amd
Cell Parameters:
a = 5.92 Å, c = 8.34 Å
Ratio:
a:c = 1 : 1.409
Unit Cell V:
292.29 ų (Calculated from Unit Cell)

Other InformationHide

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 Unnamed (Magnesium (Iron Calcium) Trisilicate)Hide

References for Unnamed (Magnesium (Iron Calcium) Trisilicate)Hide

Localities for Unnamed (Magnesium (Iron Calcium) Trisilicate)Hide

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

- 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.
Morocco
 
  • Souss-Massa Region
    • Tata Province
      • Tata Cercle
Ma (2023)
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