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CaMgB2O4(Cl,OH)2 · 5H2O Or near, with Cl:OH = 3:1
Crystal System:
Named for the Chelkar slat dome, Kazakhstan, where it was discovered.
This page provides mineralogical data about Chelkarite.

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Classification of ChelkariteHide

Approved, 'Grandfathered' (first described prior to 1959)
First Published:

H : Unclassified borates
0 :

7 : Miscellaneous

10 : Borates with other anions
1 : Borates with halide

Physical Properties of ChelkariteHide

Parallel to elongation, so mineral breaks into needles

Optical Data of ChelkariteHide

Biaxial (+)
RI values:
nα = 1.520 nγ = 1.558
Max Birefringence:
δ = 0.038
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
weak to moderate

Chemical Properties of ChelkariteHide

CaMgB2O4(Cl,OH)2 · 5H2O Or near, with Cl:OH = 3:1
IMA Formula:
CaMgB2O4Cl2 · 7H2O (?)

Crystallography of ChelkariteHide

Crystal System:
Cell Parameters:
a = 13.69 Å, b = 20.84 Å, c = 8.26 Å
a:b:c = 0.657 : 1 : 0.396
Unit Cell V:
2,356.57 ų (Calculated from Unit Cell)

Type Occurrence of ChelkariteHide

General Appearance of Type Material:
Flattened long prismatic crystals to 15 mm
Geological Setting of Type Material:
Carnallite-bischofite rock at a salt dome
Avrova, N.P., Bocharov, V.M., Khalturina, I.I., Yunosova, Z.R. (1968) Mineralogy of borates in halogen formations. Geology and Exploration of Solid Mineral Deposits of Kazakhstan: 1969: 169-173.

Other Language Names for ChelkariteHide


Related Minerals - Nickel-Strunz GroupingHide

6.H0.10Braitschite-(Ce)(Ca,Na2)7(Ce,La)2B22O43 · 7H2OHex.
6.H0.15SatimoliteKNa2(Al5Mg2)[B12O18(OH)12](OH)6Cl4·4H2OTrig. 3m (3 2/m) : R3m
6.H0.20IquiqueiteK3Na4Mg(CrO4)B24O39(OH) · 12H2OHex.
6.H0.25WardsmithiteCa5Mg[B4O7]6 · 30H2OHex.
6.H0.35HalurgiteMg4[B8O13(OH)2]2·7H2OMon. 2/m : P2/b
6.H0.40EkateriniteCa2(B4O7)(Cl,OH)2 · 2H2OHex.
6.H0.45VitimiteCa6[B14O19](SO4)(OH)14 · 5H2OMon.
6.H0.50CanavesiteMg2(HBO3)(CO3) · 5H2OMon.
6.H0.55QilianshaniteNaHCO3 · H3BO3 · 2H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

10.1.1TeepleiteNa2[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
10.1.2BandyliteCu[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
10.1.3BerboriteBe2(BO3)(OH,F) · H2OTrig.
10.1.5BoraciteMg3(B7O13)ClOrth. mm2 : Pca21
10.1.7ShabyniteMg5(BO3)(OH)5(Cl,OH)2 · 4H2OMon.
10.1.8/9/10HilgarditeCa2B5O9Cl · H2OTric. 1 : P1
10.1.12HydrochlorboriteCa4B8O15Cl2 · 21H2OMon.
10.1.13EkateriniteCa2(B4O7)(Cl,OH)2 · 2H2OHex.
10.1.14VolkovskiteKCa4[B5O8OH]4[B(OH)3]2Cl · 4H2OTric. 1 : P1
10.1.16JohachidoliteCaAlB3O7Orth. mmm (2/m 2/m 2/m) : Cmma
10.1.17SatimoliteKNa2(Al5Mg2)[B12O18(OH)12](OH)6Cl4·4H2OTrig. 3m (3 2/m) : R3m
10.1.18ChambersiteMn2+3(B7O13)ClOrth. mm2 : Pca21
10.1.19Congolite(Fe2+,Mg)3(B7O13)ClTrig. 3m : R3c

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.

References for ChelkariteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Avrova, N.P., Bocharov, V.M., Khalturina, I.I., Yunosova, Z.R. (1968) Mineralogy of borates in halogen formations. Geology and Exploration of Solid Mineral Deposits of Kazakhstan: 1969: 169-173.
Fleischer, M. (1971) New mineral names. American Mineralogist: 56: 1121-1123.
Shipovalov, Y.V. and N.P. Avrova (1971) X-ray study of the new borates aldzhanite and chelkarite. Issledovaniya v Oblasti Khimicheskikh i Fizicheskikh Metodov Analiza Mineralnogo Syr’ya: 176–179. (in Russian)
Hey, M.H., Embrey, P.G. (1974) Twenty-eighth list of new mineral names. Mineralogical Magazine: 39: 903-932.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Pekov, I.V. (1998) Chelkarite. in Minerals first discovered on the territory of the former Soviet Union, Ocean Pictures, (Moscow): 59-59.

Internet Links for ChelkariteHide

Localities for ChelkariteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Kazakhstan (TL)
  • Aktobe Region
    • Shalkar
      • Aksai Valley
AM 56 (1971), 1122
Mineral and/or Locality  
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