Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Carboborite

This page is currently not sponsored. Click here to sponsor this page.
Formula:
Ca2Mg[B(OH)4]2(CO3)2 · 4H2O
System:
Monoclinic
Hardness:
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

Approved
6.AC.50

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

27 : COMPOUND BORATES
1 : Miscellaneous
10.4.2

10 : Borates with other anions
4 : Borates with carbonate
mindat.org URL:
http://www.mindat.org/min-891.html
Please feel free to link to this page.

First Recorded Occurrence of Carboborite

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
Max Birefringence:
δ = 0.062
Image 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:
Ca2Mg[B(OH)4]2(CO3)2 · 4H2O
Essential elements:
All elements listed in formula:

Relationship of Carboborite to other Species

6.AC.05SinhaliteMgAl(BO4)
6.AC.10PseudosinhaliteMg2Al3(BO3)2(OH)O3
6.AC.15Behierite(Ta5+,Nb5+)(BO4)
6.AC.15Schiavinatoite(Nb,Ta)(BO4)
6.AC.20FroloviteCa[B(OH)4]2
6.AC.25HexahydroboriteCa[B(OH)4]2 · 6H2O
6.AC.30HenmiliteCa2Cu[B(OH)4]2(OH)4
6.AC.35BandyliteCu[B(OH)4]Cl
6.AC.40TeepleiteNa2[B(OH)4]Cl
6.AC.45Moydite-(Y)Y[B(OH)4](CO3)
6.AC.55SulfoboriteMg3[B(OH)4]2(SO4)(OH,F)2
6.AC.60LüneburgiteMg3[B2(OH)6](PO4)2 · 6H2O
6.AC.65SeamaniteMn32+[B(OH)4](PO4)(OH)2
6.AC.70CahniteCa2[B(OH)4](AsO4)
10.4.1CanavesiteMg2(HBO3)(CO3) · 5H2O
10.4.3BorcariteCa4Mg(B4O6(OH)6)(CO3)2
10.4.4SakhaiteCa12Mg4(BO3)7(CO3)4(OH)2Cl
10.4.5Moydite-(Y)Y[B(OH)4](CO3)
10.4.6GaudefroyiteCa4Mn3+2-3(BO3)3(CO3)(O,OH)3

Other Names for Carboborite

Name in Other Languages:
German:Carboborit
Simplified Chinese:水碳硼石
Spanish:Carboborita
Traditional Chinese:水碳硼石

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 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

Localities for Carboborite

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.
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.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2015, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: March 28, 2015 16:06:31 Page generated: March 23, 2015 19:58:56