Nobleite

Nobleite is a rare borate mineral with the chemical formula CaB₆O₉(OH)₂·3H₂O. It was discovered in 1961, in Death Valley, California, and is named for Levi F. Noble, a USGS geologist, in honor of his contributions to the geology of the Death Valley region.

CategoryPhylloborates

FormulaCaB₆O₉(OH)₂·3H₂O

IMA symbolNob^[1]

Strunz classification6.FC.05

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Nobleite
Nobleite, Death Valley, California
General
Category	Phylloborates
Formula	CaB6O9(OH)2·3H2O
IMA symbol	Nob[1]
Strunz classification	6.FC.05
Crystal system	Monoclinic
Crystal class	Prismatic (2/m) (same H-M symbol)
Space group	P21/a
Identification
Luster	Vitreous[2]
Streak	White[2]
Specific gravity	2.09[2]
Density	2.09[2]
Ultraviolet fluorescence	Non-fluorescent[2]
Solubility	Slightly soluble in water[2]

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Nobleite has also been identified at two localities in Chile and Argentina.