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This article is about the mineral. For the ancient people, see Kassites.
Category Hydroxide mineral
(repeating unit)
Strunz classification 4.DH.10
Dana classification 08.03.09
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group P21/a
Formula mass 235.09 g/mol
Color Brown red, colorless, light yellow
Crystal habit Pseudo hexagonal
Common, on {101} and {181}.
Cleavage {010} Perfect, {101} Indistinct
Fracture Brittle
Tenacity Very Brittle
Mohs scale hardness 5
Luster Adamantine
Streak White
Specific gravity 3.42
Density 3.42
Optical properties Biaxial (–), 2V=58°, Dispersion very strong, r > v
Refractive index nα = 1.95, nβ = 2.13, nγ = 2.21
Birefringence δ = 0.26
Pleochroism none
Other characteristics Not radioactive
References [1][2]

Kassite is a rare mineral whose chemical formula is CaTi2O4(OH)2. It crystallizes in the orthorhombic crystal system and forms radiating rosettes and pseudo-hexagonal tabular crystals which are commonly twinned. Kassite crystals are brownish pink to pale yellow in color, are translucent, and have an adamantine luster. Cleavage is distinctly visible, and the crystals are very brittle.

It was first described in 1965 in the Afrikanda pyroxenite massif, a formation on Russia's Kola Peninsula and was named for Nikolai Grigorievich Kassin (1885–1949), a prominent Russian geologist. It occurs as miarolytic cavity fillings of alkalic pegmatites in the Kola occurrence and in nepheline syenite in the Magnet Cove igneous complex of Arkansas, US. Its mineral association includes cafetite (which with it is also polymorphous), perovskite, titanite, rutile and ilmenite.