Cacoxenite (in quartz/amethyst)
Cacoxenite is an official mineral name for a secondary mineral found in oxidized zones of particularly phosphate-rich rocks. Almost always as small spherical aggregates of…
Category: Gem or Scam? Library
Blue alexandrite
Misleading synonym for blue or violet sapphire, a variety of corundum. The name “blue alexandrite” may be used to make the stone more attractive to…
Cactus quartz
Trade name for a variety/growth form of quartz in which the crystals are surrounded by a second generation of smaller crystals grown perpendicular to the…
Blue aventurine
Commercial name for blue quartz or quartzite-like material with shimmering inclusions of mica, ilmenite or hematite. Most blue aventurine offered comes from India and is…
(Crop) Circle Stones
Commercial name for polished flint said to have been found near (English) crop circles. Crop circles occur all over the world, but those in England…
Calligraphy stone
Commercial name for a yellowish-brown to brownish-red rock from the Indian Himalayas with light brown lines and arches. The curved lines are cross sections of…
Cinnazez™
Registered trade name for a combination of cinnabar and white quartz. The quartz in this case is referred to as Azeztulite™. Since Oct. 25, 2013,…
Citrine
Mineralogical name for a yellow-brown or yellow-green variety of quartz. The cause of the color is still under debate. Most “true” citrine gets its yellow…
Lemon chrysoprase
Misleading name used for a nickel-bearing variety of magnesite from Australia. Thus, it is not chrysoprase. Chrysoprase is a nickel-containing variety of chalcedony, and magnesite…
Cal silica / calsilica jasper
Commercial name for a man-made product, so not a natural mineral! But that is often not disclosed. It consists of calcium carbonate, plastic and paint…
