Fluorite
Pyrite on quartz; King County, Washington
celestite
Smithsonite
Halite - back-lit by halogen light to show the purple color tones (13.7 cm)
Crystal Red Cognac Amber
A specimen of deep crystal colors found only in Mexican amber. This large piece of amber is a deep crystal red; when tilted, the color transforms to a cognac green. These specimens are called “stop lights” by the locals, because of their stop light-like ability to change from red to green.
Dumortierite
Calcite with internal red phantoms
Fletcher mine, Missouri
Shattuckite after malachite; Okenwasi Mine, Kunene Region, Namibia
Chalcopyrite on pyrite; Recuerdo Vein, Huanzala Mine, Peru
Spessartine Garnet and Quartz by Orbital Joe on Flickr.
Quartz (var: Smoky Quartz), SiO2, and Microcline (var: Amazonite), KAlSi3O8
Locality: Colorado, USA
Sylvanite with gold on fluorite and quartz; Teller County, Colorado
Fluroite with barite; Hardin County, Illinois