Post by 1dave on Jun 22, 2014 8:18:29 GMT -5
I made a correction in the first post, replaced a S.G. of 2.33 with the correct 3.33!
Some valuable reading on Jade is at:
Canadian Rockhound 2000
The Jade Mines of B.C. By Marilyn Fraser, tells the story of Winnie Robertson who had a theory - probably that Jadeite would be formed when metamorphosed in the presence of sodium -
It all turned out to be nephrite, but there was so much of it that she became known as "The Jade Queen."
After further research, I now believe that nephrite is formed from calcium rich Gabbro, while Jadeite is formed from sodium rich Diorite.
Some valuable reading on Jade is at:
Canadian Rockhound 2000
The Jade Mines of B.C. By Marilyn Fraser, tells the story of Winnie Robertson who had a theory - probably that Jadeite would be formed when metamorphosed in the presence of sodium -
She studied the geology of jade for some twelve years under the guidance of Dr. Robert Folinsbee, Professor of Geology at the University of Alberta in Edmonton, who was a great jade lover. Certain a large deposit could be found in the mountains above Fort St. James, B.C., and following her theory, she noted the zones where soda granite contacted serpentine. The best prospect appeared to be in the remote Takla Lake area. With two backers, Tezzeron Nephrite Co. was formed to finance a field trip.
She chartered an FH-1100 helicopter to explore the Mount Sidney Williams' area at the south end of Takla Lake accompanied by her 16-year-old son, Gordon, and two other men. After three days of exploring the area, searching for the contact zone, she found enough water-worn jade boulders in O'Ne-ell creek to establish a camp on the lower part of the creek, so they could further prospect the area. They also prepared the good quality jade boulders to be lifted out and loaded onto a barge on the Middle River.
She chartered an FH-1100 helicopter to explore the Mount Sidney Williams' area at the south end of Takla Lake accompanied by her 16-year-old son, Gordon, and two other men. After three days of exploring the area, searching for the contact zone, she found enough water-worn jade boulders in O'Ne-ell creek to establish a camp on the lower part of the creek, so they could further prospect the area. They also prepared the good quality jade boulders to be lifted out and loaded onto a barge on the Middle River.
It all turned out to be nephrite, but there was so much of it that she became known as "The Jade Queen."
After further research, I now believe that nephrite is formed from calcium rich Gabbro, while Jadeite is formed from sodium rich Diorite.