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|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
|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:||22.214.171.124|
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
Crystallography of Carboborite
|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 Å³ (Calculated from Unit Cell)|
Optical Data of Carboborite
|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.
Chemical Properties of Carboborite
|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):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Carboborite
|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
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
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.
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Locality Updated: Balzi Rossi (Baoussé-Roussé), Ventimiglia, Imperia Province, Liguria, ItalyFrom Paolo Bosio, 28th Nov 2014 11:46:13