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Formula: Ca3TiFe3+AlO8
Oxide, brownmillerite subgroup,
perovskite supergroup,
titanium-bearing mineral
Crystal System: Orthorhombic
Specific gravity: 3.84 calculated
Hardness: 6 to 7
Streak: Light brown
Colour: Reddish brown
Environments
Shulamitite is a relatively new mineral, approved in 2011. It is intermediate between
perovskite and
brownmillerite.
Localities
At the type locality, the Hatrurim Basin, Tamar Regional Council, Southern District, Israel, shulamitite was
discovered as a major mineral in a high-temperature
larnite-chlormayenite rock.
It is associated with larnite,
fluormayenite,
chromium-bearing spinel,
ye’elimite, fluorapatite
and magnesioferrite, and retrograde (the mineralogical adjustment of
relatively high-grade metamorphic rocks to temperatures lower than those of their initial metamorphism) phases
portlandite, hematite,
hillebrandite, afwillite,
foshagite and katoite. The
shulamitite forms reddish brown subhedral grains or prismatic platelets up to 200 microns and intergrowths up
to 500 microns in size. Shulamitite from the Hatrurim Basin crystallised under combustion metamorphism
conditions characterized by very high temperatures (1150 to 1170oC) and low pressures (the
high-temperature region of the
spurrite-merwinite facies)
(EJM 25.1.97-111).
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