Bario-orthojoaquinite

bario-orthojoaquinite

benitoite

joaquinite

fresnoite

Images

Formula: Ba₄Fe²⁺₂Ti₂O₂(SiO₃)₈.H₂O
Cyclosilicate (ring silicate), joaquinite group
Crystal System: Orthorhombic
Specific gravity: 3.959 measured, 3.962 calculated
Hardness: 5 to 5½
Colour: Yellow-brown
Common impurities: Al,TR,Mn,Ca,Na
Environments:

Metamorphic environments

Bario-orthojoaquinite has been reported only from the type locality, the Dallas Gem mine, San Benito county, California, USA, and from the nearby Victor claim (Mindat January 2020). At the type locality it occurs in a block of highly fractured basalt subjected to high-pressure metamorphism and serpentinisation, associated with joaquinite-(Ce), benitoite, baotite, fresnoite and natrolite (Dana, HOM). The crystals are zoned with a joaquinite core (AM 67.809).

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