Al2SiO5Orthorhombic
Andalusite
Al2SiO5
SilicatesChemical FormulaAl2SiO5
Crystal SystemOrthorhombic
Mohs Hardness7.5
Specific Gravity3.17
ColorPink, brown, green, gray
LusterVitreous
StreakWhite
CleavageTwo directions
FractureConchoidal to uneven
Occurrence
Found in metamorphic rocks. Chiastolite variety shows cross pattern.