Datolite is often found in basalt vesicles with calcite and zeolites. In fact, it is often confused with certain zeolites because of its luster, color and associations. 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.