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About CarboboriteHide

Ca2Mg[B(OH)4]2(CO3)2 · 4H2O
Crystal System:
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 CarboboriteHide


A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc

1 : Miscellaneous

10 : Borates with other anions
4 : Borates with carbonate

Physical Properties of CarboboriteHide


Optical Data of CarboboriteHide

Biaxial (-)
RI values:
nα = 1.507 nβ = 1.546 nγ = 1.569
Max Birefringence:
δ = 0.062
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of CarboboriteHide

Ca2Mg[B(OH)4]2(CO3)2 · 4H2O

Crystallography of CarboboriteHide

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

Crystal StructureHide

Unit Cell | Structure | Polyhedra | Str. + Poly
Best | x | y | z | a | b | c
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AMCSDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0012074CarboboriteZhesheng M, Nicheng S, Jinchuan S, Zhizhong P (1981) The refinement of the crystal structure of carboborite MgCa2[CO3]2[B(OH)4]2*4H2O Bulletin de Mineralogie 104 578-58119810296

Type Occurrence of CarboboriteHide

Other Language Names for CarboboriteHide

Simplified Chinese:水碳硼石
Traditional Chinese:水碳硼石

Related Minerals - Nickel-Strunz GroupingHide

6.AC.05SinhaliteMgAl(BO4)Orth. mmm (2/m 2/m 2/m) : Pnma
6.AC.15Béhierite(Ta5+,Nb5+)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.15Schiavinatoite(Nb,Ta)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.25HexahydroboriteCa[B(OH)4]2 · 2H2O or CaB2O4 · 6H2OMon. 2/m : B2/b
6.AC.35BandyliteCu[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.40TeepleiteNa2[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.45Moydite-(Y)Y[B(OH)4](CO3)Orth. mmm (2/m 2/m 2/m) : Pbca
6.AC.55SulfoboriteMg3[B(OH)4]2(SO4)(OH,F)2Orth. mm2
6.AC.60LüneburgiteMg3[B2(OH)6](PO4)2 · 6H2OTric.
6.AC.65SeamaniteMn2+3[B(OH)4](PO4)(OH)2Orth. mmm (2/m 2/m 2/m)
6.AC.70CahniteCa2[B(OH)4](AsO4)Tet. 4 : P4

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

10.4.1CanavesiteMg2(HBO3)(CO3) · 5H2OMon.
10.4.4SakhaiteCa12Mg4(BO3)7(CO3)4(OH)2ClIso. m3m (4/m 3 2/m) : Fd3m
10.4.5Moydite-(Y)Y[B(OH)4](CO3)Orth. mmm (2/m 2/m 2/m) : Pbca

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 CarboboriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 CarboboriteHide

Localities for CarboboriteHide

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.
China (TL)
  • Qinghai
    • Haixi Mongol and Tibetan Autonomous Prefecture
      • Da Qaidam (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.; Zheng, M. P., Qi, W., & Yuan, H. R. (2005). Characteristics of salt lake boron deposits and magnesium borate deposits of the Qinghai-Tibet Plateau, China. In Mineral Deposit Research: Meeting the Global Challenge (pp. 1123-1125). Springer Berlin Heidelberg.
  • Shandong
    • Yantai
      • Qixia City
Handbook of Mineralogy
Handbook of Mineralogy
  • Sakha Republic (Yakutia)
    • Polar Yakutia
      • Dogdo River Basin
        • Tas-Khayakhtakh Range
Tony Nickischer
  • California
    • Inyo Co.
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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