Darwinite / Darwin glass
A natural form of impact glass (tektite) created by the impact of a meteorite in western Tasmania, Australia. It was named after Mount Darwin in…
Category: Gem or Scam? Library
Cradle of humankind stone / cradle of life stone
The fantasy name (cradle of humankind) refers to an archaeological site in South Africa (30 km northwest of Johannesburg), where, among other things, the oldest…
Blizzard stone
Commercial name for a type of gabbro, a dark rock with small white dots (feldspar crystals) from Alaska. Do you have a nice example of…
Creation Stone Agate™
Commercial name for … how surprising … agate. And you won’t be surprised that this name, too, was introduced by Robert Simmons (Heaven & Earth).…
Dendrite /dendritic agate/chalcedony
Different names for a variety of translucent gray-blue chalcedony or quartz with dark branch-like inclusions (dendrites) of manganese oxides. Dendrite comes from the Greek word…
Crazy lace agate
Commercial name for an agate consisting of multicolored winding and twisting bands. The designation lace refers to its resemblance to the structure of lace. A…
Chalcanthite
Chalcanthite is a natural mineral, a water-soluble copper sulfate, also called copper vitriol. It is a secondary mineral formed in arid climates or in rapidly…
Denim lapis
Trade name for a light blue variety of lapis lazuli, after the color of denim fabric. The color difference is caused by a higher calcite…
Catlinite
Commercial name for a particular type of red metamorphic argillite (a sedimentary rock). It occurs in quartzite and includes the clay minerals pyrophyllite and sericite.…
Bloodstone
The name bloodstone is used for various types of minerals and rocks, both historically and in the modern gemstone trade. Originally the name refers to…
