Medusa Quartz Classification
Colorless With Green, Blue-Green Inclusions
Gilalite In Quartz
Refractive index, appearance, birefringence, optic character and optic figure. A bull's-eye optic figure is determinative for quartz; may also show Airy's spiral optic figure and Brazil-law twinning under crossed polarizing filters.
Medusa quartz gets its name because the gilalite inclusions look like the Medusas Rondeau jellyfish.