Home > American Minerals III – May 26 > MS1584 Nobleite after Colemanite (author's material)

Nobleite after Colemanite (author's material)


Nobleite is a hydrated calcium borate, specifically the calcium dominant analog of tunellite. The mineral name honors Levi F. Noble (1882-1965), geologist at the U.S. Geological Survey, who studied the Death Valley region including its borate deposits. Erd et al. (1961) used material from this locality to describe the species.

This is an unusual example of nobleite, wherein it is replacing prismatic colemanite. A very unusual pseudomorph. The nobleite itself is colorless and transparent, grain size around 0.5 mm. This specimen carries a R. C. Erd collection label, who was the senior author of the description of the species.

Price: $50

Item code: MS1584

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