Fairy opal
Commercial name for low quality opal or matrix opal (small specks of opal in matrix of, for example, sandstone or a volcanic rock), which is…
Category: Gem or Scam? Library
Fairy Stone
Commercial name for concretions of calcite (calcium carbonate) and clay, formed in glacial deposits around a core of, say, a pebble or crystal. A kind…
Fancy jasper
Commercial name for various stones. When the book was published in 2022, this misleading commercial name was mainly used for a red and white banded…
Fire and Ice quartz
Commercial name for thermally shocked or heat-treated quartz. Heating and cooling create internal fractures, often with so-called “rainbows” due to refraction of light. So it…
Phoenix jasper
Misleading commercial name for ared and white banded calcite, contains no jasper or quartz at all. The name is an esoteric reference to the mythicalPhoenix,…
Flame (Fire) Stone
Unregistered commercial name for a sodalite syenite, a rock containing orange-yellow fluorescent sodalite. Introduced in connection with the trademark registration for similar material under the…
Fluorite
Official mineral name for calcium fluoride, a mineral that comes in a huge variety of colors and forms. While most fluorite is simply natural, there…
Phosphosiderite
Official mineral name for a mineral sold primarily as lilac/violet cabochons and beads. Usually referred to as coming from the Andes Mountains in Chile, an…
Frosterley Marble / Stone
Trade name for a fossil-rich limestone from Frosterley, Weardale, in northeastern England. This rock originated beneath shallow tropical seas about 330-325 million years ago, in…
Gaia Stone
Commercial name for man-made glass said to be made with or colored by volcanic ash from Mount St. Helens. Known primarily as Helenite, but also…
