Scolecite is a hydrated calcium silicate mineral belonging to the Zeolite group. It commonly occurs as sprays of thin, prismatic needles, frequently flattened on one side. Scolecite is usually colorless or white, but can also be pink, salmon, red or green. It is transparent to translucent, with a white streak and a luster which is vitreous, or silky for fibrous specimens. Scolecite is a common Zeolite often found with associated minerals including quartz, apophyllite and stilbite.