This is a larger group of crystals. Hydrated Calcium Aluminum silicate - CaAl 2Si 3 O 10 - 3H 2O A very nice grouping of white crystals. From Jalgaon District, Maharashtra, India. Size is 4 inches x 2-3/4 inches x 1 inches high. Some Mesolite fibers are intwined in the Scolecite.