CHEMISTRY Ca2Al3 (SiO4) (Si2O7) O (OH)
It is dimorphous with Clinozoisite.
CRYSTALLOGRAPHY - Orthorhombic
CRYSTAL GROWTH AND HABITS - Crystals are typically long prismatic with striations parallel to their long axis [010].
COLOR AND OTHER OPTICAL PROPERTIES - Normally gray to greenish gray or greenish brown. It can also be pink, purple, blue (Tanzanite) or colorless.
HARDNESS - 6 - 7
SPECIFIC GRAVITY - 3.15 - 3.36
LUSTER - Vitreous to slightly pearly on cleavage faces.
STREAK - White
BREAKABILITY - Zoisite has nearly perfect cleavage along {010} and imperfect along {100}. It has an uneven fracture and is brittle.
OCCURRENCE
ASSOCIATED MINERALS
NAME