Industrial Minerals with emphasis on Western North America 287

• Main Author: George J. Sim
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Cassiar; Dease Lake
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.534.4154; http://www.empr.gov.bc.ca/mining/geoscience/industrialminerals/documents/p2004-2-57.pdf

Jade is a commercial term encompassing green, white, black or yellow-brown material that consists either of Na-rich pyroxene (jadeite) or prismatic to acicular amphiboles of the tremolite-actinolite series that form bundles that are randomly oriented and interlocked (nephrite). Nephrite is tougher (harder to break) than jadeite material. Its fracture strength is about 200 MN/m2 whereas that of jadeite is about 100 MN/m2. On the other hand, jadeite material is harder (7 compared to 6.5 on the Mohs scale). JADE IN BRITISH COLUMBIA There are over fifty known nephrite occurrences in British Columbia. These are located in the Cassiar, Cry and Dease Lake, and Mount Ogden areas, as well as in