Pork Stone (Crystal)
Commercial name for a red and white banded calcite. Inclusions of probably iron in the various layers create a banded pattern reminiscent of a piece…
Category: Gem or Scam? Library
Prase
Designation for leek green quartz, both micro and macrocrystalline and regardless of the cause of the green color. Originally, “prase” was applied as a variety…
Powerball
Commercial name for dyed quartz geodes from Morocco. There are several varieties of it in circulation, the most common being painted black on the outside…
Prasiolite
Name for a green transparent variety of macrocrystalline quartz. Occasionally found in association with amethyst (including in Poland and Canada) and therefore sometimes called green…
Prasolite
Name for afibrous leek green variety of the chlorite group, from Kilpatrick Hills, Scotland. An aluminosilicate of magnesium and iron, probably a variety of chlorite.…
Prase Opal
A long-standing name for a green variety of opal. Nowadays the name chrysopal is also used for the green nickel-containing opal from Kosovo, among other…
Preseli Bluestone / Preseli Spotted Dolerite
Local name for a chemically converted igneous rock (dolerite) found in the Preseli Mountains in Pembrokeshire, Wales, United Kingdom, but the stone is best known…
Prophecy Stone / Z-Stone
Commercial name for a star-shaped pseudomorph of goethite after marcasite. Originally formed as marcasite crystals on the sea floor, later converted to iron hydroxides, mainly…
Pruskite
Trade name for lab-grown crystals on matrix, usually made in Poland. The crystals can be either yellow (potassium hexacyanoferrate, containing divalent iron) or red (potassium…
Prystine / Prystyne
Trade name name for a dense, fine-grained, pure white variety of magnesite from a site on the Utah-Nevada border in the United States. Unclear whether…
