Geology Home Page
Roger Weller, geology instructor
Chemical Group: silicate- a pyroxene
Chemical Formula: NaAlSi2O6
Color: usually green, white, rarely violet or brown Streak: white
Luster: vitreous to waxy when polished
Specific Gravity: 3.25 to 3.35
Cleavage: good cleavage (110), but rarely seen due to fine grain size
Tenacity: exceedingly tough
Crystal Forms: Monoclinic
Crystals are rare; usually found as dense massive material, fine-grained.
Identifying Characteristics: Jadeite is very similar in appearance to nephrite jade,
but it melts at a lower temperature.
Uses: as a gemstone and for carvings
Occurrences: Burma, Japan, Guatemala; In the USA from California
Toxicity: when-swallowed- when inhaled-