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Siwaqaite

A valid IMA mineral species
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07906870015880252529195.jpg
Siwaqaite

North Siwaqa complex, Daba-Siwaqa complex, Transjordan Plateau, Amman Governorate, Jordan
04324410016477825681459.jpg
Siwaqaite

Daba marble quarry, Daba, Daba-Siwaqa complex, Transjordan Plateau, Amman Governorate, Jordan
07906870015880252529195.jpg
Siwaqaite

North Siwaqa complex, Daba-Siwaqa complex, Transjordan Plateau, Amman Governorate, Jordan
04324410016477825681459.jpg
Siwaqaite

Daba marble quarry, Daba, Daba-Siwaqa complex, Transjordan Plateau, Amman Governorate, Jordan
07906870015880252529195.jpg
Siwaqaite

North Siwaqa complex, Daba-Siwaqa complex, Transjordan Plateau, Amman Governorate, Jordan
04324410016477825681459.jpg
Siwaqaite

Daba marble quarry, Daba, Daba-Siwaqa complex, Transjordan Plateau, Amman Governorate, Jordan
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About SiwaqaiteHide

Formula:
Ca6Al2(CrO4)3(OH)12 · 26H2O
Colour:
Canary yellow
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
1.819 (Calculated)
Crystal System:
Trigonal
Name:
Named for the Siwaqa area, Jordan, the type locality.
The Cr (chromate) analogue of ettringite. First chromate-dominant group member. First chromate mineral to combine Ca and Al.

The temperature of formation is not higher than ~70–80 °C, based on mineral association and inferred from the formation conditions of the natural and synthetic members of the ettringite group minerals, which are stable at conditions of T < 120 °C and pH = 9.5–13.


Unique IdentifiersHide

Mindat ID:
53414
Long-form identifier:
mindat:1:1:53414:1
GUID
(UUID V4):
594aa3cb-2cee-4e8c-a7f6-a00aa900b0bf

IMA Classification of SiwaqaiteHide

Classification of SiwaqaiteHide

Strunz-mindat (2023):
7.DG.15

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
G : With large and medium-sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3

Mineral SymbolsHide

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

SymbolSourceReference
SiwIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of SiwaqaiteHide

Lustre:
Vitreous
Transparency:
Translucent
Colour:
Canary yellow
Streak:
Yellowish-gray
Hardness:
2 on Mohs scale
Comment:
Based on scratch tests; micro-hardness test could not be performed
Tenacity:
Brittle
Cleavage:
Perfect
(1010)
Parting:
None observed
Fracture:
Irregular/Uneven
Density:
1.819 g/cm3 (Calculated)
Comment:
Could not be measured

Optical Data of SiwaqaiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.512(2) nε = 1.502(2)
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic

Chemistry of SiwaqaiteHide

Mindat Formula:
Ca6Al2(CrO4)3(OH)12 · 26H2O
Elements listed:
Al, Ca, Cr, H, O - search for minerals with similar chemistry

Crystallography of SiwaqaiteHide

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
P3 1c
Cell Parameters:
a = 11.3640(2) Å, c = 21.4485(2) Å
Ratio:
a:c = 1 : 1.887
Unit Cell V:
2,398.78 ų (Calculated from Unit Cell)
Morphology:
Hexagonal prisms, terminated by a pyramid or a pinacoid.
Twinning:
None observed

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.841 Å(100)
5.682 Å(65)
5.021 Å(16)
4.709 Å(38)
3.900 Å(29)
3.280 Å(17)
3.279 Å(33)
2.224 Å(16)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47e : [Vanadates, chromates, manganates]

Type Occurrence of SiwaqaiteHide

Type Locality:
ⓘ North Siwaqa complex, Daba-Siwaqa complex, Transjordan Plateau, Amman Governorate, Jordan
General Appearance of Type Material:
Grain aggregates and hexagonal prismatic crystals up to 250 mm in size
Place of Conservation of Type Material:
Collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration number 5277/1
Geological Setting of Type Material:
Thin veins and small cavities in spurrite marble
Associated Minerals at Type Locality:
Calcite
Reference:
Juroszek, R., Krüger, B., Galuskina, I., Krüger, H., Vapnik, Y., Galuskin, E. (2020) Siwaqaite, Ca6Al2(CrO4)3(OH)12·26H2O, a new mineral of the ettringite group from the pyrometamorphic Daba-Siwaqa complex, Jordan. American Mineralogist: 105(3): 409–421.

Synonyms of SiwaqaiteHide

Relationship of Siwaqaite to other SpeciesHide

Member of:
Ettringite Group
Other Members of this group:
BentoriteCa6Cr2(SO4)3(OH)12 · 26H2OTrig. 3m : P3 1c
BuryatiteCa3(Si,Fe3+,Al)(SO4)B(OH)4(OH,O)6 · 12H2OTrig. 3m : P3 1c
CarraraiteCa3(SO4)[Ge(OH)6](CO3) · 12H2OHex.
CharlesiteCa6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2OTrig. 3m : P3 1c
ChiyokoiteCa3Si(CO3)[B(OH)4]O (OH)5 · 12H2OHex. 6 : P63
EttringiteCa6Al2(SO4)3(OH)12 · 26H2OTrig. 3m : P3 1c
HielscheriteCa3Si(SO4)(SO3)(OH)6 · 11H2OHex. 6 : P63
ImayoshiiteCa3Al(CO3)[B(OH)4](OH)6 · 12H2OHex. 6 : P63
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
SturmaniteCa6Fe3+2(SO4)2.5[B(OH)4](OH)12 · 25H2OTrig. 3m : P3 1c
TatarinoviteCa3Al(SO4)[B(OH)4](OH)6 · 12H2OHex. 6 : P63
ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2OHex. 6 : P63
UM2008-07-CO:AlBCaHSSiCa6(Al,Si)2(CO3,SO4)2[B(OH)4](OH,O)12 · 26H2O
Unnamed (possible Mn(IV) analogue of Sturmanite)Ca6Mn4+2(SO4)2[B(OH)4](OH)10O2 · nH2O

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Siwaqaite associated with HashemiteBaCr6+O4
2 photos of Siwaqaite associated with CalciteCaCO3

Related Minerals - Strunz-mindat GroupingHide

7.DG.MathesiusiteK5(UO2)4(SO4)4(VO5) · 4H2OTet. 4/m : P4/n
7.DG.05DarapskiteNa3(SO4)(NO3) · H2OMon. 2/m : P21/m
7.DG.10Clinoungemachite(Na, K, Fe, SO4)Mon. 2/m
7.DG.10HumberstoniteNa7K3Mg2(SO4)6(NO3)2 · 6H2OTrig. 3 : R3
7.DG.10UngemachiteK3Na8Fe(SO4)6(NO3)2 · 6H2OTrig. 3 : R3
7.DG.15BentoriteCa6Cr2(SO4)3(OH)12 · 26H2OTrig. 3m : P3 1c
7.DG.15CharlesiteCa6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2OTrig. 3m : P3 1c
7.DG.15EttringiteCa6Al2(SO4)3(OH)12 · 26H2OTrig. 3m : P3 1c
7.DG.15JouravskiteCa3Mn4+(SO4)(CO3)(OH)6 · 12H2OHex. 6 : P63
7.DG.15SturmaniteCa6Fe3+2(SO4)2.5[B(OH)4](OH)12 · 25H2OTrig. 3m : P3 1c
7.DG.15ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2OHex. 6 : P63
7.DG.15CarraraiteCa3(SO4)[Ge(OH)6](CO3) · 12H2OHex.
7.DG.15BuryatiteCa3(Si,Fe3+,Al)(SO4)B(OH)4(OH,O)6 · 12H2OTrig. 3m : P3 1c
7.DG.15BiruniteCa18(SiO3)8.5(CO3)8.5SO4 · 15H2O(?)
7.DG.15HielscheriteCa3Si(SO4)(SO3)(OH)6 · 11H2OHex. 6 : P63
7.DG.15KottenheimiteCa 3Si(SO4)2(OH)6 · 12H2O Hex. 6/m : P63/m
7.DG.15ImayoshiiteCa3Al(CO3)[B(OH)4](OH)6 · 12H2OHex. 6 : P63
7.DG.15TatarinoviteCa3Al(SO4)[B(OH)4](OH)6 · 12H2OHex. 6 : P63
7.DG.15ChiyokoiteCa3Si(CO3)[B(OH)4]O (OH)5 · 12H2OHex. 6 : P63
7.DG.20RapidcreekiteCa2(SO4)(CO3) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
7.DG.25TatarskiteCa6Mg2(SO4)2(CO3)2(OH)4Cl4 · 7H2OOrth.
7.DG.30NakauriiteCu8(SO4)4(CO3)(OH)6 · 48H2OOrth.
7.DG.35Chessexite(Na,K)4Ca2(Mg,Zn)3Al8(SO4)10(SiO4)2 · 40H2OOrth.
7.DG.40CarlosruiziteK6(Na,K)4Na6Mg10(SeO4)12(IO3)12 · 12H2OTrig. 3m (3 2/m) : P3c1
7.DG.40FuenzalidaiteK6(Na,K)4Na6Mg10(SO4)12(IO3)12 · 12H2OTrig. 3m (3 2/m) : P3c1
7.DG.45Chelyabinskite(Ca,Mg)3(SO4,CO3)2[Si(OH)6] · 9H2O (?)Orth.
7.DG.55Ramazzoite[Mg8Cu12(PO4)(CO3)4(OH)24(H2O)20][(H0.33SO4)3(H2O)36]Iso. 4 3m : P4 3m
7.DG.60WitzkeiteNa4K4Ca(NO3)2(SO4)4 · 2H2O Mon. 2/m : B2/b

Other InformationHide

IR Spectrum:
Absorption bands at 3318 and 3620 cm-1 (O-H stretching), 1629 and 1650 cm-1 (bending vibration of water), 1108 and 540 cm-1 (asymmetric stretching and bending of (SO4)2-), 540 cm-1 (Al-OH bending vibrations), and 869 cm-1 (asymmetric stretching vibrations of (CrO4)2-).
Notes:
Dissolved in 10% HCl and loses color in ethanol at room temperature.
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 SiwaqaiteHide

References for SiwaqaiteHide

Reference List:
Juroszek, R., Krüger, B., Galuskina, I.O., Krüger, H., Vapnik, Y. and Galuskin, E.V. (2019) Siwaqaite, IMA 2018-150. CNMNC Newsletter No. 48, April 2019: 317. Mineralogical Magazine: 83: 315-317.
Juroszek, R., Krüger, B., Galuskina, I., Krüger, H., Vapnik, Y., Galuskin, E. (2020) Siwaqaite, Ca6Al2(CrO4)3(OH)12·26H2O, a new mineral of the ettringite group from the pyrometamorphic Daba-Siwaqa complex, Jordan. American Mineralogist: 105(3): 409–421.
Juroszek, R., Krüger, B., Galuskina, I., Krüger, H., Vapnik, Y., Galuskin, E. (2020) Siwaqaite, Ca6Al2(CrO4)3(OH)12·26H2O, a new mineral of the ettringite group from the pyrometamorphic Daba-Siwaqa complex, Jordan. American Mineralogist: 105(3): 409–421.

Localities for SiwaqaiteHide

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.
Jordan (TL)
 
  • Amman Governorate
    • Transjordan Plateau
      • Daba-Siwaqa complex
Mineralogical Magazine: 83: 315-317.
Juroszek, R., Krüger, B., Galuskina, I.O., Krüger, H., Vapnik, Y. and Galuskin, E.V. (2019) Siwaqaite, IMA 2018-150. CNMNC Newsletter No. 48, April 2019: 317
Juroszek, R., Krüger, B., Galuskina, I., Krüger, H., Vapnik, Y., Galuskin, E. (2020) Siwaqaite, Ca6Al2(CrO4)3(OH)12·26H2O, a new mineral of the ettringite group from the pyrometamorphic Daba-Siwaqa complex, Jordan. American Mineralogist: 105(3): 409–421.
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