Definition of purity
Definitions of mineral clarity under artificial lighting:
1. clear - defines the absence of impurities under a 10x magnifying glass
2. eye-clean – defines the absence of impurities visible to the naked eye
3. impurities – defines impurities that are visible to the naked eye and whose acceptability you can assess from the photos in the listing
4. opaque – refers to a mineral that is translucent but not transparent