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Formula: Ba2Fe2+Si2O7
Sorosilicate (Si2O7 groups), melilite group,
barium-bearing mineral
Crystal System: Tetragonal
Specific gravity: 4.39 calculated
Hardness: 5
Streak: White
Colour: Light yellow to lemon coloured
Environments
Volcanic igneous environments
Metamorphic environments
Localities
At the type locality, the Gurim anticline, Hatrurim Basin, Tamar Regional Council, Beersheba Subdistrict, Southern
District, Israel, bennesherite was discovered in thin veins of
rankinite paralava
within pyrometamorphic gehlenite
hornfels. Bennesherite occurs in small intergranular spaces
between large crystals of rankinite,
gehlenite and garnet together
with other barium minerals such as
fresnoite, walstromite,
zadovite, gurimite,
hexacelsian and celsian. In
some grains, epitaxial intergrowths of bennesherite and fresnoite
are observed
(AM 107.1.138-146).
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