Dims: 2.25" x 1.5" x 1.5"(5.7 x 3.8 x 3.8 cm)
Wt: 1.80 oz.(51.0 g)
Clear Creek, San Benito County, California, U.S.A.
Though these Natrolite crystals come from a well-known locality for this particular mineral, there are a few aspects of them that strike me as odd. First, their general size and proportions: these crystals are short, stubby, and thick! Second, they are eight-sided; there are 4 main prism faces and 4 secondary faces between each main face. Finally, they are generally a milky white color, with only the largest crystal showing any good transparency. They rest on a base of what appears to be a basalt that shows some decay. This host rock also serves as a matrix for several other pieces of embedded natrolite- one can see small examples of Natrolite's good cleavage in this rock. I don't know if this form is standard for San Benito specimens, but I certainly wasn't expecting it!