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Carboborite

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Formula:
Ca
 
2
Mg[B(OH)
 
4
]
 
2
(CO
 
3
)
 
2
· 4H
 
2
O
System:MonoclinicHardness:2
Name:Named in allusion to the composition, containing the essential anionic chemical components, CARBOnate and BORate.


This mineral has been reported from an undisclosed salt lake on the Qinghai-Tibet plateau (Xie et al., 1964), a huge area that includes northern Tibet and northwestern Qinghai provinces. According to Yang (1991), Da Qaidam salt lake in Qinghai Province is the only occurrence of the mineral in that area.

Classification of Carboborite

IMA status:Approved
Strunz 8th edition ID:5/G.10-30
Nickel-Strunz 10th (pending) edition ID:6.AC.50

6 : BORATES
A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc
Dana 8th edition ID:27.1.1.1

27 : COMPOUND BORATES
1 : Miscellaneous
Hey's CIM Ref.:10.4.2

10 : Borates with other anions
4 : Borates with carbonate
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Type Occurrence of Carboborite

Type Locality:Da Qaidam salt lake (Dachaidan salt lake), Da Qaidam Co. (Dachaidan Co.), Haixi Autonomous Prefecture, Qinghai Province, China
Year of Discovery:1964

Physical Properties of Carboborite

Hardness (Mohs):2

Crystallography of Carboborite

Crystal System:Monoclinic
Cell Parameters:a = 18.59Å, b = 6.68Å, c = 11.32Å
β = 91.68°
Ratio:a:b:c = 2.783 : 1 : 1.695
Unit Cell Volume:V 1,405.13 ų (Calculated from Unit Cell)

Optical Data of Carboborite

Type:Biaxial (-)
RI values: nα = 1.507 nβ = 1.546 nγ = 1.569
Maximum Birefringence:δ = 0.062

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:none

Chemical Properties of Carboborite

Formula:
Ca
 
2
Mg[B(OH)
 
4
]
 
2
(CO
 
3
)
 
2
· 4H
 
2
O
Simplified for copy/paste:Ca2Mg[B(OH)4]2(CO3)2·4H2O
Essential elements:B, C, Ca, H, Mg, O
All elements listed in formula:B, C, Ca, H, Mg, O

Relationship of Carboborite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.AC.05Sinhalite
MgAl(BO
 
4
)
6.AC.10Pseudosinhalite
Mg
 
2
Al
 
3
(BO
 
3
)
 
2
(OH)O
 
3
6.AC.15Behierite
(Ta
5+
 
,Nb
5+
 
)(BO
 
4
)
6.AC.15Schiavinatoite
(Nb,Ta)(BO
 
4
)
6.AC.20Frolovite
Ca[B(OH)
 
4
]
 
2
6.AC.25Hexahydroborite
Ca[B(OH)
 
4
]
 
2
· 6H
 
2
O
6.AC.30Henmilite
Ca
 
2
Cu[B(OH)
 
4
]
 
2
(OH)
 
4
6.AC.35Bandylite
Cu[B(OH)
 
4
]Cl
6.AC.40Teepleite
Na
 
2
[B(OH)
 
4
]Cl
6.AC.45Moydite-(Y)
Y[B(OH)
 
4
](CO
 
3
)
6.AC.55Sulfoborite
Mg
 
3
[B(OH)
 
4
]
 
2
(SO
 
4
)(OH,F)
 
2
6.AC.60Lüneburgite
Mg
 
3
[B
 
2
(OH)
 
6
](PO
 
4
)
 
2
· 6H
 
2
O
6.AC.65Seamanite
Mn
2+
3
[B(OH)
 
4
](PO
 
4
)(OH)
 
2
6.AC.70Cahnite
Ca
 
2
[B(OH)
 
4
](AsO
 
4
)
Related Minerals - Hey's Index Grouping:

- +
10.4.1Canavesite
Mg
 
2
(HBO
 
3
)(CO
 
3
) · 5H
 
2
O
10.4.3Borcarite
Ca
 
4
Mg(B
 
4
O
 
6
(OH)
 
6
)(CO
 
3
)
 
2
10.4.4Sakhaite
Ca
 
12
Mg
 
4
(BO
 
3
)
 
7
(CO
 
3
)
 
4
(OH)
 
2
Cl
10.4.5Moydite-(Y)
Y[B(OH)
 
4
](CO
 
3
)
10.4.6Gaudefroyite
Ca
 
4
Mn
3+
2-3
(BO
 
3
)
 
3
(CO
 
3
)(O,OH)
 
3

Other Names for Carboborite

Other Languages:
German:Carboborit
Russian:Карбоборит
Simplified Chinese:水碳硼石
Spanish:Carboborita
Traditional Chinese:水碳硼石

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 Carboborite

Reference List:

- +
Xiande Xie, Laibao Liu, and Ziqiang Qian (1964): New mineral - Carboborite, MgCa2(CO3)(B2O5) x 10H2O. Scientia Sinica 13(5), 813-821 (in Russian). - American Mineralogist (1965), 50, 262 (abstract).

Bulletin de Mineralogie 104, 578-581.

Shaoxiu Yang (1991): Saline deposits and minerals of salt lakes in Qinghai-Xizang plateau. Journal of Lake Sciences 3(1), 1-10 (in Chinese with English abstract).

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

Internet Links for Carboborite

Search Engines:
  • Look for Carboborite on Google
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  • External Links:
  • Look for Carboborite on Webmineral
  • Look for Carboborite on Athena Mineralogy
  • Look for Carboborite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Carboborite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Fine Minerals from Weinrich Minerals, Inc.
  • Fabre Minerals - search for Carboborite specimens
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  • Localities for Carboborite

    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.
    China
     
    • Qinghai Province
      • Haixi Autonomous Prefecture
        • Da Qaidam Co. (Dachaidan Co.)
    Xiande Xie, Laibao Liu, and Ziqiang Qian (1964): Scientia Sinica 13(5), 813-821 (in Russian); Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10; Garrett, D.E. (1998): Borates: Handbook of deposits, processing, properties, and use. Academic Press (San Diego, London), 491 pp.
    Russia
     
    • Eastern-Siberian Region
      • Sakha Republic (Saha Republic; Yakutia)
        • Polar Yakutia
          • Dogdo River Basin
            • Tas-Khayakhtakh Range
    Tony Nickischer
    USA
     
    • California
      • Inyo Co.
    USGS
    McAllister, James Franklin (1970) Geology of the Furnace Creek borate area, Death Valley, Inyo County, California. California Division of Mines and Geology Map Sheet 14, 9 pp.: 9; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 243.
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