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Chelkarite

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Formula:
CaMgB2O4(Cl,OH)2 · 5H2O Or near, with Cl:OH = 3:1
System:
Orthorhombic
This page provides mineralogical data about Chelkarite.

Classification of Chelkarite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
6.HA.05

6 : BORATES
H : Unclassified borates
A :
26.7.2.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
7 : Miscellaneous
10.1.15

10 : Borates with other anions
1 : Borates with halide
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Type Occurrence of Chelkarite

Year of Discovery:
1968

Crystallography of Chelkarite

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

Optical Data of Chelkarite

Type:
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:
Moderate
Dispersion:
weak to moderate

Chemical Properties of Chelkarite

Formula:
CaMgB2O4(Cl,OH)2 · 5H2O Or near, with Cl:OH = 3:1
Essential elements:
All elements listed in formula:

Relationship of Chelkarite to other Species

6.HA.15SatimoliteKNa2Al4[Cl|B2O5]3 · 13H2O
6.HA.20IquiqueiteK3Na4Mg(CrO4)B24O39(OH) · 12H2O
6.HA.25WardsmithiteCa5Mg[B4O7]6 · 30H2O
6.HA.35HalurgiteMg2[B4O7]2 · 5H2O
6.HA.45VitimiteCa6[(OH)14|SO4|B14O19] · 5H2O
10.1.1TeepleiteNa2[B(OH)4]Cl
10.1.2BandyliteCu[B(OH)4]Cl
10.1.3BerboriteBe2(BO3)(OH,F) · H2O
10.1.4FluoboriteMg3(BO3)(F,OH)3
10.1.5BoraciteMg3(B7O13)Cl
10.1.6KarliteMg7(BO3)3(OH,Cl)5
10.1.7ShabyniteMg5(BO3)(OH)5(Cl,OH)2 · 4H2O
10.1.8/9/10HilgarditeCa2B5O9Cl · H2O
10.1.11SolongoiteCa2(H3B3O7)(OH)Cl
10.1.12HydrochlorboriteCa4B8O15Cl2 · 21H2O
10.1.13EkateriniteCa2(B4O7)(Cl,OH)2 · 2H2O
10.1.14VolkovskiteKCa4[B5O8OH]4[B(OH)3]2Cl · 4H2O
10.1.16JohachidoliteCaAlB3O7
10.1.17SatimoliteKNa2Al4[Cl|B2O5]3 · 13H2O
10.1.18ChambersiteMn32+(B7O13)Cl
10.1.19Congolite(Fe2+,Mg)3(B7O13)Cl
10.1.20EricaiteFe32+(B7O13)Cl

Other Names for Chelkarite

Name in Other Languages:
German:Chelkarit
Spanish:Chelkarita

Other Information

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 Chelkarite

Reference List:
American Mineralogist (1971): 56: 1122.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Chelkarite

Localities for Chelkarite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Kazakhstan (TL)
 
  • Aktobe Province (Aqtöbe Oblysy; Aktubinskaya Oblast')
    • Aksai Valley
AM 56 (1971), 1122
Mineral and/or Locality  
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