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Chelkarite

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Formula:
CaMgB
 
2
O
 
4
(Cl,OH)
 
2
· 5H
 
2
O Or near, with Cl:OH = 3:1
System:Orthorhombic
This page provides mineralogical data about Chelkarite.

Classification of Chelkarite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:5/J.02-20
Nickel-Strunz 10th (pending) edition ID:6.HA.05

6 : BORATES
H : Unclassified borates
A :
Dana 8th edition ID:26.7.2.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
7 : Miscellaneous
Hey's CIM Ref.:10.1.15

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

Type Locality:Chelkar salt dome, Aksai Valley, Aktobe Province (Aqtöbe Oblysy; Aktubinskaya Oblast'), Kazakhstan
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
Maximum Birefringence:δ = 0.038

Chart 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:
CaMgB
 
2
O
 
4
(Cl,OH)
 
2
· 5H
 
2
O Or near, with Cl:OH = 3:1
Simplified for copy/paste:CaMgB2O4(Cl,OH)2·5H2O Or near, with Cl:OH = 3:1
Essential elements:B, Ca, Cl, H, Mg, O
All elements listed in formula:B, Ca, Cl, H, Mg, O

Relationship of Chelkarite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.HA.15Satimolite
KNa
 
2
Al
 
4
[Cl|B
 
2
O
 
5
]
 
3
· 13H
 
2
O
6.HA.20Iquiqueite
K
 
3
Na
 
4
Mg(CrO
 
4
)B
 
24
O
 
39
(OH) · 12H
 
2
O
6.HA.25Wardsmithite
Ca
 
5
Mg[B
 
4
O
 
7
]
 
6
· 30H
 
2
O
6.HA.35Halurgite
Mg
 
2
[B
 
4
O
 
7
]
 
2
· 5H
 
2
O
6.HA.45Vitimite
Ca
 
6
[(OH)
 
14
|SO
 
4
|B
 
14
O
 
19
] · 5H
 
2
O
6.HA.55Qilianshanite
NaHCO
 
3
· H
 
3
BO
 
3
· 2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
10.1.1Teepleite
Na
 
2
[B(OH)
 
4
]Cl
10.1.2Bandylite
Cu[B(OH)
 
4
]Cl
10.1.3Berborite
Be
 
2
(BO
 
3
)(OH,F) · H
 
2
O
10.1.4Fluoborite
Mg
 
3
(BO
 
3
)(F,OH)
 
3
10.1.5Boracite
Mg
 
3
(B
 
7
O
 
13
)Cl
10.1.6Karlite
Mg
 
7
(BO
 
3
)
 
3
(OH,Cl)
 
5
10.1.7Shabynite
Mg
 
5
(BO
 
3
)(OH)
 
5
(Cl,OH)
 
2
· 4H
 
2
O
10.1.8/9/10Hilgardite
Ca
 
2
B
 
5
O
 
9
Cl · H
 
2
O
10.1.11Solongoite
Ca
 
2
(H
 
3
B
 
3
O
 
7
)(OH)Cl
10.1.12Hydrochlorborite
Ca
 
4
B
 
8
O
 
15
Cl
 
2
· 21H
 
2
O
10.1.13Ekaterinite
Ca
 
2
(B
 
4
O
 
7
)(Cl,OH)
 
2
· 2H
 
2
O
10.1.14Volkovskite
KCa
 
4
[B
 
5
O
 
8
OH]
 
4
[B(OH)
 
3
]
 
2
Cl · 4H
 
2
O
10.1.16Johachidolite
CaAlB
 
3
O
 
7
10.1.17Satimolite
KNa
 
2
Al
 
4
[Cl|B
 
2
O
 
5
]
 
3
· 13H
 
2
O
10.1.18Chambersite
Mn
2+
3
(B
 
7
O
 
13
)Cl
10.1.19Congolite
(Fe
2+
 
,Mg)
 
3
(B
 
7
O
 
13
)Cl
10.1.20Ericaite
Fe
2+
3
(B
 
7
O
 
13
)Cl

Other Names for Chelkarite

Other Languages:
German:Chelkarit
Spanish:Chelkarita

Other Information

Health Warning: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

Search Engines:
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  • External Links:
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  • Look for Chelkarite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Chelkarite details from Handbook of Mineralogy (PDF)
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  • Localities for Chelkarite

    The 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. ? 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
     
    • Aktobe Province (Aqtöbe Oblysy; Aktubinskaya Oblast')
      • Aksai Valley
    AM 56 (1971), 1122
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