Jonesite

jonesite

neptunite

benitoite

natrolite

Images

Formula: KBa₂Ti₂(Si₅Al)O₁₈.nH₂O
Valence: KBa₂Ti⁴⁺₂(Si₅Al)O₁₈.nH₂O
Inosilicate (Chain silicate), double and triple chains, barium- and titanium- bearing mineral
Crystal system: Monoclinic
Specific gravity: 3.25 measured, 3.17 calculated
Hardness: 3 to 4
Colour: Colourless
Luminescence: Orange yellow fluorescence under short wave UV, weak orange-yellow under long wave UV
Common impurities: B,Fe,Nb,Mn,Mg,Ca,Sr
Environments

Metamorphic environments

Localities

At the type locality, the California State Gem Mine, Santa Rita Peak, San Benito County, California, USA, jonesite occurs in fractures and cavities of brecciated greenstone enclosed in blueschist. Associated minerals include neptunite, benitoite, joaquinite and natrolite (HOM).
Jonesite from the California State Gem Mine - Image

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