|Color||red to brown.|
|Habitus||Ortorombic. Usually prismatic crystals with square cross section.|
|Cleavage||Distinct prismatic, fracture uneven to subconchoidal.|
|Occurance||In metamorph rock as schist, quartzite and sometimes in pegmatites and hydrothermal veins.|
|Associates||In pegmatites with korund, turmaline, topas.|
|Notes|| Polymorphs : Kyanite and
Andalusite is created in temperatures from 250-800 degrees C and pressures from 0 to 4 kbar.
Flourescens : weakly green, green, yellowish green.
| To silicate index.
|| Mineral group index.
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