Hübnerite and Quartz minor dusting of Pyrite! Specimen shows deep red internal reflections when backlit. Huayllapon Mine, Peru
Agate (chalcedony) makroglobulyarnogo buildings - one more reason to think about the specific role of silica gel in the crystallization of agates. Sample 14 × 9cm., China.
Green Amber (fossilized tree resin from an ancient relative of a tropical species called “algarroba”) from Dominican Republic