Datolite is also found in the Lake Superior region of Michigan. It is associated with native copper at this location and is found in porcelain-like masses and nodules. The nodules are brown to off white in color and some are cut and polished as a ornamental stone. Color is white, colorless, yellowish, reddish, gray, brown and green. Luster is vitreous to greasy.
Crystals are transparent to translucent.
Also in porcelain-like masses that form nodules. Aggregates can be fibrous or granular. Cleavage is absent. Fracture is conchoidal to uneven. Associated Minerals are prehnite , danburite , babingtonite , epidote , copper , calcite , quartz and zeolites .