Carboborite
Carboborite is an IMA-recognized mineral species in the carbonate class, with the chemical formula Ca₂Mg[B(OH)₄]₂(CO₃)₂·4H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/n).
Key properties: Mohs hardness 2; specific gravity 2.12; Vitreous luster; optically biaxial.
IMA symbol Cab, IMA status: approved, named in 1964.
Found in a lacustrine borate deposit.
It is found associated with Ulexite, hydroboracite, gypsum.
The name refers to the essential anionic chemical components, CARBOnate and BORate.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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