Iceland Spar
What are all the methods in which Iceland Spar can be mined?
I'm working on a project in school and if I am to finish it, I kinda need to know how to mine Iceland Spar. I looked all over the web, but none of the sites are any good. please help! and please, include the link if You Can.....=(
Because it occurs in vugs, veins, its pretty much just dug out as far as I can tell:
Iceland spar in New mexico has been mined from an open pit
http://www.minsocam.org/MSA/collectors_corner/arc/nmcalcite.htm
Iceland spar from Iceland (Helgustadir) occurs in pockets of basalt (hardened lava). It was quarried, but the description of the quarry indicates that a cave was created.The working face of the quarry was described as a cavity in the rock about 12 by 5 yards, and about 10 feet high.
http://www.mindat.org/article.php/190/Helgustadir+Iceland+Spar+Mine
http://giantcrystals.strahlen.org/europe/helgustadir.htm
Here's a site describing locations and occurrences of optical calcite in Montana-It doesn't describe the mining method.http://www.mbmg.mtech.edu/sp28/minm-sod.htm
Mined/quarried in China: http://giantcrystals.strahlen.org/asia/hejiawan.htm
The Garibaldi Mine in Australia, which includes Iceland spar, is really a crystal-covered cave.http://giantcrystals.strahlen.org/library/garibaldi.htm
Iceland Spar Calcite and Double Refraction
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