|
Post by gingerkid on Jul 21, 2015 12:55:09 GMT -5
Thanks, Don! I'll keep an eye out for your pic.
Even though the ones you posted were cut for spheres, I like 'em cubed, too, especially the howlite. What's the purple one? Is it lepidolite?
|
|
|
Post by jakesrocks on Jul 21, 2015 13:05:45 GMT -5
Jan, the howlite is old stock Tic Canyon, Cal. material. The purple is a type of onyx. Not sure of the location on that one.
|
|
|
Post by jakesrocks on Jul 21, 2015 13:29:30 GMT -5
Not a good pic. Editor feature in Photobucket isn't working. This is an end cut from the block that has been sitting out in the sunlight since 1996.
|
|
Deleted
Deleted Member
Member since January 1970
Posts: 0
|
Post by Deleted on Jul 22, 2015 16:27:03 GMT -5
Depends on the source of the color. For instance Jan's crest more is a blue form that does not fade.
If the color is inherent in the mineral Azurite for instance, it will not fade due to Sunlight exposure. If the color is due to a mineral stain that is in a high oxidation state (amethyst) then the sun will cause the ferrite/manganate to reduce to a lower oxidation state and change color.
|
|