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Roger Weller, geology instructor
Chemical Group: silicate
Chemical Formula: varies from (Na,Ca)4Al3(Al,Si)3Si6O24(Cl,CO3,SO4) to
Color: white, gray, pale green, light blue, light red, yellow Luster: vitreous
Hardness: 5 to 6
Specific Gravity: 2.65 to 2.74
Cleavage: imperfect cleavage
Crystal Forms: Tetragonal
Crystals are commonly prismatic.
Mineral Associations: Scapolite forms in contact metamorphic rocks;
it is associted with diopside, amphibole, garnet, apatite, sphene, zircon
Identifying Characteristics: square cross section of crystals; 4 directions of cleavage at 450
Uses: when transparent as a gemstone
Occurrences: Canada; in the USA in Massachusetts and New York
Toxicity: when-swallowed- when inhaled-
Additional Information: Scapolite is also known as wernerite.
Sometimes scapolite fluoresces orange or yellow under ultraviolet light.