Quartz: SiO2
From "Quartz" in German. Discovered by Agricola (529).
Quartz with Dioptase
Quartz with Gilalite:
discovered in 2004 in Brasil.
It was discribed In "Gems and Gemology", Vol. 41, numéro 3, fall 2005.
It is also sometimes called "Medusa quartz" or "Paraïba quartz".
See the gallery->
Quartz with Hollandite:
Quartz with Rutile:
_Quartz with Tourmaline:
