UM2001-19-SiO:AlCaMgNa (original) (raw)

Valid as an unnamed mineral

Formula:

(Na,Mg,Ca)(Mg,Al)Si2O6

Specific Gravity:

3.344 (Calculated)

Crystal System:

Monoclinic

The Na analogue of omphacite.

As inclusions in diamonds, from alluvials.

EPMA data [wt%]:

Na2O 6.21
CaO 5.07
MgO 16.13
MnO 0.47
FeO 3.18
NiO 0.0
Al2O3 8.34
Cr2O3 3.14
TiO2 0.01
SiO2 57.07

total 99.63

This corresponds to (Na0.42Mg0.36Ca0.19Mn0.01)Σ0.99(Mg0.48Al0.35Cr0.09Fe3+0.07Fe2+0.02)Σ1.00Si2O6.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:54303:3

c3fb88fc-b7b1-4a19-912e-295b507a8538

IMA Classification of UM2001-19-SiO:AlCaMgNaHide

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IMA status notes:

Unnamed (probably valid)

Physical Properties of UM2001-19-SiO:AlCaMgNaHide

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Density:

3.344 g/cm3 (Calculated)

Chemistry of UM2001-19-SiO:AlCaMgNaHide

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Mindat Formula:

(Na,Mg,Ca)(Mg,Al)Si2O6

Crystallography of UM2001-19-SiO:AlCaMgNaHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 9.587(4) Å, b = 8.699(6) Å, c = 5.247(4) Å
β = 108.33(4)°

Ratio:

a:b:c = 1.102 : 1 : 0.603

Unit Cell V:

415.38 ų (Calculated from Unit Cell)

Relationship of UM2001-19-SiO:AlCaMgNa to other SpeciesHide

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Other Members of this group:

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.

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References for UM2001-19-SiO:AlCaMgNaHide

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Localities for UM2001-19-SiO:AlCaMgNaHide

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ⓘ - 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.