CHEMISTRY - CaB2(SiO4)2
CRYSTALLOGRAPHY - Orthorhombic
CRYSTAL GROWTH AND HABITS - Danburite forms distinct prismatic crystals that have a square or rhomboidal cross section. It can also be massive.
COLOR AND OTHER OPTICAL PROPERTIES - Commonly clear to white but also yellowish to brown or greenish.
HARDNESS - 7 - 7.5
SPECIFIC GRAVITY - 2.9 - 3.00
LUSTER - Vitreous to greasy
STREAK - White
BREAKABILITY - Poor cleavage in one direction; uneven to sub conchoidal fracture; brittle.
OCCURRENCE - Danburite occurs in metamorphosed carbonate rocks and in granites associated with hydrothermal activity. It is also found in evaporites.
MINERAL NAME - Named after the locality where it was found: Danbury, Connecticut.