Sinjarite
A valid IMA mineral species
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About Sinjarite
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
GUID
(UUID V4):
(UUID V4):
b58f942d-f3e8-4f80-886d-f7c72c55ddc3
IMA Classification of Sinjarite
Approved
First published:
1980
Type description reference:
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 |
---|---|---|
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 = 1.540 nβ = 1.540
Max Birefringence:
δ = 1.540
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Chemistry of Sinjarite
Mindat Formula:
CaCl2 · 2H2O
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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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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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
Reference:
Aljubouri, Z.A., Aldabbagh, S.M. (1980) Sinjarite, a new mineral from Iraq. Mineralogical Magazine: 43: 643-645.
Synonyms of Sinjarite
Other Language Names for Sinjarite
Related Minerals - Strunz-mindat Grouping
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 | Aravaipaite | Pb3AlF9 · H2O |
3.BB.35 | Tachyhydrite | CaMg2Cl6 · 12H2O |
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
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Please feel free to link to this page.
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References for Sinjarite
Localities for Sinjarite
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).
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.
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 Z A (1980) |
Russia | |
| Cesnokov et al. (1998) |
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Cheleken Peninsula, Balkan Province, Turkmenistan