Copal / copalite
Designation for a young, semi-fossilized resin (1,000 years – 1 million years old), from the copal tree Protium copal (Burseraceae). Used by the cultures of…
Category: Gem or Scam? Library
Coppernite / copperlite
Commercial name for a dark gray-green to brown rock with black crystals/grains and sometimes angular crystals with a coppery flash (hence the name). Also sold…
Coracalcite™ / Golden Coracalcite™
Commercial unregistered name for golden or honey-colored calcite from Florida. Also called Golden Coracalcite™. A contraction of the words coral (coral) and calcite. This name…
Collamalcite
Unnecessary compound name for a combination of blue chrysocolla and green malachite in a complex pattern in a matrix of white rock. Introduced by Robert…
Carnelian
Variety name for orange-red to reddish-brown chalcedony. Usually translucent and without bands. A banded chalcedony is usually called agate, but we see orange-red banded agate…
Cristo ribbon variscite
Commercial name for veins of green variscite in black carbon-rich rock, probably graphite schist or chert, from Nevada, United States. Because it is quite brittle…
Blue obsidian
Misleading commercial name for man-made, blue-colored glass. Sometimes with swirly “inclusions” but mostly crystal clear in various shades of blue. Sometimes clearly identifiable as glass…
Coquina jasper
Commercial name for a yellowish-brown to brownish-red sedimentary rock from the Indian Himalayas with light brown lines and arches. The curved lines are transverse sections…
Crimson Cuprite™
Commercial unregistered name for a combination of chrysocolla and cuprite from Mexico. Do you have a nice example of this stone and would like to…
Coromandel Stonewood™
Commercial unregistered name for petrified wood from the Coromandel Peninsula, New Zealand. Again, a fantasy name introduced by Robert Simmons (Heaven & Earth). Do you…
