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Harmunite, naturally occurring calcium ferrite CaFe 2 O 4 , was discovered in the Hatrurim Complex of pyrometamorphic larnite rocks close to the Jabel Harmun, the Judean Desert, West Bank, Palestinian Autonomy, Israel. The new mineral occurs in larnite pebbles of the pseudo-conglomerate, the cement of which consists of intensely altered larnite-bearing rocks. Srebrodolskite, magnesioferrite, and harmunite are intergrown forming black porous aggregates to the central part of the pebbles. Larnite, fluorellestadite, ye’elimite, fluormayenite, gehlenite, ternesite, and calciolangbeinite are the main associated minerals. Empirical crystal chemical formula of harmunite from type specimen is as follows Ca 1.013 (Fe 3+   1.957 Al 0.015 Cr 3+   0.011 Ti 4+  0.004  Mg 0.003 )S 1.993 O 4 . Calculated density is 4.404 g/cm 3 , microhardness VHN 50  is 655 kg/mm 2 . The Raman spectrum of harmunite is similar to that of the synthetic analog. Harmunite in hand specimen is black and under reflected plane-polarized light is light gray with red internal reflections. Reflectance data for the COM wavelengths vary from  ~ 22% (400 nm) to  ~ 18% (700 nm).

Harmunite CaFe 2 O 4 : A new mineral from the Jabel Harmun, West Bank, Palestinian Autonomy, Israel