Physical Properties
Zussmanite occurs in pale green tabular crystals with perfect cleavage. It tends to be uniaxial, weakly pleochroic and a specific gravity of 3.146 (Agrell et al.,1965). Other types of zussmanite found in Laytonville, which are of fine-grained samples are assumed to be late-stage metamorphic products. The perfect cleavage is a result of the continuous sheets of (Fe,Mg)-(O,OH) octahedra parallel to (0001). The optical properties result from virtually pure zussmanite that was separated from thin sections, approximately 200 micrometres thick, under a polarizing microscope by means of a microdrill. The indices of refraction compare well with those determined be Agrell et al.,1965 for the chemically different Zussmanite from the Laytonville quarry (Massonne et al., 1998).
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