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UM2008-07-CO:AlBCaHSSi

Invalid as an unnamed mineral
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Formula:
Ca6(Al,Si)2(CO3,SO4)2[B(OH)4](OH,O)12 · 26H2O
chemically zoned (EPMA data)
Hardness:
2½
Specific Gravity:
1.84
Reported as carbonate-dominant analogue of charlesite.

Note: the formula is very similar to that of imayoshiite (also a member of the group), but differs in amount of water. Status is thus set to invalid.

Found in a calcite vein occurring between a crystalline limestone and a gehlenite-spurrite skarn. Likely low-temperature hydrothermal.

Hexagonal bipyramidal crystals, up to 6 mm in size.


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Unique IdentifiersHide

Mindat ID:
54958
Long-form identifier:
mindat:1:1:54958:7

IMA Classification of UM2008-07-CO:AlBCaHSSiHide

IMA status notes:
Unnamed (probably invalid)

Physical Properties of UM2008-07-CO:AlBCaHSSiHide

Hardness:
2½ on Mohs scale
Comment:
Vickers h.: 96.0 kg/cm2
Density:
1.84 g/cm3 (Measured)    

Optical Data of UM2008-07-CO:AlBCaHSSiHide

Type:
Uniaxial (-)
RI values:
nω = 1.498(2) nε = 1.462(2)
Max. Birefringence:
δ = 0.036
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.

Surface Relief:
Moderate

Chemistry of UM2008-07-CO:AlBCaHSSiHide

Mindat Formula:
Ca6(Al,Si)2(CO3,SO4)2[B(OH)4](OH,O)12 · 26H2O

chemically zoned (EPMA data)
Element Weights:
Element% weight
O65.877 %
Ca20.627 %
H5.879 %
Al4.629 %
C2.061 %
B0.927 %

Calculated from ideal end-member formula.
Elements listed:
Al, B, C, Ca, H, O, S, Si - search for minerals with similar chemistry

Relationship of UM2008-07-CO:AlBCaHSSi to other SpeciesHide

Member of:
Ettringite Group
Other Members of Ettringite Group:
BentoriteCa6Cr2(SO4)3(OH)12 · 26H2OTrig. 3m : P31c
BuryatiteCa3(Si,Fe3+,Al)(SO4)B(OH)4(OH,O)6 · 12H2OTrig. 3m : P31c
CarraraiteCa3(SO4)[Ge(OH)6](CO3) · 12H2OHex.
CharlesiteCa6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2OTrig. 3m : P31c
ChiyokoiteCa3Si(CO3)[B(OH)4]O (OH)5 · 12H2OHex. 6 : P63
EttringiteCa6Al2(SO4)3(OH)12 · 26H2OTrig. 3m : P31c
HielscheriteCa3Si(SO4)(SO3)(OH)6 · 11H2OHex. 6 : P63
ImayoshiiteCa3Al(CO3)[B(OH)4](OH)6 · 12H2OHex. 6/mmm(6/m2/m2/m) : P63/mmc
JouravskiteCa3Mn4+(SO4)(CO3)(OH)6 · 12H2OHex. 6 : P63
KottenheimiteCa 3Si(SO4)2(OH)6 · 12H2O Hex. 6/m : P63/m
Micheelsenite(Ca2Y)Al(PO3OH)(CO3)(OH)6 · 12H2OHex. 6 : P63
SiwaqaiteCa6Al2(CrO4)3(OH)12 · 26H2OTrig. 3m : P31c
SturmaniteCa6Fe3+2(SO4)2.5[B(OH)4](OH)12 · 25H2OTrig. 3m : P31c
TatarinoviteCa3Al(SO4)[B(OH)4](OH)6 · 12H2OHex. 6 : P63
ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2OHex. 6 : P63
'Unnamed (possible Mn(IV) analogue of Sturmanite)'Ca6Mn4+2(SO4)2[B(OH)4](OH)10O2 · nH2O

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 UM2008-07-CO:AlBCaHSSiHide

References for UM2008-07-CO:AlBCaHSSiHide

Localities for UM2008-07-CO:AlBCaHSSiHide

Showing 1 localities.

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.
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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.
Japan
 
  • Okayama Prefecture
    • Takahashi City
      • Bitchū
        • Fuka
Kusachi et al. (2008)
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