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Mineralpedia Details for Jonesite

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Jonesite

Jonesite

Named after Francis Tucker Jones, a Research Chemical Microscopist of California, USA who was the discoverer of the mineral. Jonesite is a rare mineral that can be found in the United States at its type locality in the Dallas Gem mine in California, in Slovakia at Vechec, and in the Atlantic Ocean along the Mid-Atlantic Ridge. Jonesite is found in fractures and cavities of breccaited greenstone within blueschist. Jonesite fluoresces a dull orange under shot=wave ultraviolet light.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/jonesite.pdf

Formula
KBa2Ti2(Si5Al)O18┬ĚnH2
Crystal System
Monoclinic 
Crystal Habit
Bladed, Tabular 
Cleavage
Distinct, None, None 
Luster
Vitreous (Glassy) 
Color
colorless 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Irregular 
Hardness
3-4 
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Jonesite from Gem mine, San Benito Co., California, United States

Jonesite
            from Gem mine, San Benito Co., California, United States

Well-formed divergent group of Jonesite crystals (clear, platy, terimated) to 0.75mm.

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