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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 page provides mineralogical data about Carboborite.

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: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

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.

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

Internet Links for Carboborite

Search Engines:
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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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  • 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
    Xiande Xie, Laibao Liu, and Ziqiang Qian (1964): Scientia Sinica 13(5), 813-821 (in Russian); Qian Yang (1989): Acta Sedimentologica Sinica 7(2)
        • Da Qaidam Co. (Dachaidan Co.)
    Garrett, D.E. (1998): Borates: Handbook of deposits, processing, properties, and use. Academic Press (San Diego, London), 491 pp.
    USA
     
    • California
      • Inyo Co.
        • Death Valley National Park
    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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