Paraiba quartz
A commercial name for quartz with inclusions of the mineral gilalite. Named after the site of Paraiba, Brazil and thus not after the color of…
Medusa quartz
A commercial name for quartz with inclusions of the mineral gilalite. Under magnification, the blue and green inclusions resemble Medusa quartz. Medusa quartz from Brazil…
Analysis: apatite in cleavelandite or not?
By now there are a lot of stones on the market with blue spots, under a lot of different names. One name that has recently…
