This is some very nice medium Labradorite.  The pieces range in size from 5/8″ to 1 1/4″. This is great rock for the tumbler or use it just as is for fountains or other decorative uses. They have a variety of “flash” colors when rotated in bright light. This beautiful material comes from Madagascar.  Take time to enjoy something different for your tumbling projects by trying some Labradorite.  

Just as a suggestion, you may get a better polish if you add an additional step to your tumbling process by adding a 1000 Aluminum Oxide grit between the pre-polish and polish stages.

MOHS hardness scale 5.5