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Sinjarite
A valid IMA mineral species
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About Sinjarite
Sinjar, Iraq
Formula:
CaCl2 · 2H2O
Colour:
Pale pink
Lustre:
Vitreous, Resinous
Hardness:
1½
Specific Gravity:
1.66
Crystal System:
Tetragonal
Name:
Named after the Sinjar Wadi, Iraq, its discovery locality. It is pronounced sĭ·njārait.
Type Locality:
Strongly hygroscopic.
Unique Identifiers
Mindat ID:
3673
Long-form identifier:
mindat:1:1:3673:9
IMA Classification of Sinjarite
Approved
First published:
1980
Classification of Sinjarite
3.BB.25
3 : HALIDES
B : Simple halides, with H2O
B : M:X = 1:2
3 : HALIDES
B : Simple halides, with H2O
B : M:X = 1:2
9.2.5.1
9 : NORMAL HALIDES
2 : AX2
9 : NORMAL HALIDES
2 : AX2
8.4.8
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
4 : Halides of the alkaline earths and Mg
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
4 : Halides of the alkaline earths and Mg
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Snj | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Sinjarite
Vitreous, Resinous
Transparency:
Translucent
Colour:
Pale pink
Hardness:
1½ on Mohs scale
Cleavage:
Very Good
Well developed prismatic
Well developed prismatic
Density:
1.66 g/cm3 (Measured) 1.60 g/cm3 (Calculated)
Optical Data of Sinjarite
Type:
Uniaxial
RI values:
nα = 1.54 nβ = 1.54
Max. Birefringence:
δ = 0.000
Based on recorded range of RI values above.
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.
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 Sinjarite
Mindat Formula:
CaCl2 · 2H2O
Element Weights:
Elements listed:
Crystallography of Sinjarite
Crystal System:
Tetragonal
Cell Parameters:
a = 7.21 Å, c = 5.86 Å
Ratio:
a:c = 1 : 0.813
Unit Cell V:
304.63 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Elongated prismatic crystals
Comment:
Point Group: n.d.; Space Group: n.d. (synthetic).
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0009590 | Sinjarite | Leclaire A, Borel M M (1977) Le dichlorure de calcium dihydrate Acta Crystallographica B33 1608-1610 |  | 1977 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.82 Å | (100) |
| 3.04 Å | (99) |
| 6.09 Å | (86) |
| 2.96 Å | (71) |
| 2.73 Å | (71) |
| 3.06 Å | (66) |
| 2.36 Å | (51) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 25 : Evaporites (prebiotic) | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 50 : Coal and/or oil shale minerals | <0.36 |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 54 : Coal and other mine fire minerals (see also #51 and #56) |
Type Occurrence of Sinjarite
Place of Conservation of Type Material:
Museum of Natural History, University of Mosul.
Geological Setting of Type Material:
Braided wadi filling in area of limestones
Synonyms of Sinjarite
Other Language Names for Sinjarite
Related Minerals - Strunz-mindat Grouping
| 3.BB. | Králíkite | BaCl2 · 2H2O |
| 3.BB.05 | Eriochalcite | CuCl2 · 2H2O |
| 3.BB.10 | Rokühnite | FeCl2 · 2H2O |
| 3.BB.15 | Bischofite | MgCl2 · 6H2O |
| 3.BB.20 | Nickelbischofite | NiCl2 · 6H2O |
| 3.BB.30 | Antarcticite | CaCl2 · 6H2O |
| 3.BB.35 | Tachyhydrite | CaMg2Cl6 · 12H2O |
| 3.BB.35 | Aravaipaite | Pb3AlF9 · H2O |
| 3.BB.40 | Ghiaraite | CaCl2 · 4H2O |
Other Information
Special Storage/
Display Requirements:
Display Requirements:
Extremely hydroscopic
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 Sinjarite
mindat.org URL:
https://www.mindat.org/min-3673.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Sinjarite
Reference List:
Leclaire, A., Borel, M. M. (1977) Le dichlorure de calcium dihydraté. Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 33 (5) 1608-1610 doi:10.1107/s0567740877006645
Aljubouri, Zeki A., Aldabbagh, Salim M. (1980) Sinjarite, a new mineral from Iraq. Mineralogical Magazine, 43 (329) 643-645 doi:10.1180/minmag.1980.043.329.13
Fleischer, M., Cabri, L. J., Chao, G. Y., Pabst, A. (1980) New mineral names. American Mineralogist, 65 (9-10). 1065-1070
Localities for Sinjarite
Showing 4 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Azerbaijan | |
| Novgorodova M.I. (caspian Sea) |
Czech Republic | |
| Varilová et al. (2011) |
Iraq (TL) | |
| Aljubouri et al. (1980) |
Russia | |
| Cesnokov et al. (1998) |
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Cheleken Peninsula, Balkan Region, Turkmenistan