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…
Category: Gem or Scam? Library
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…
Purple Angeline™
Unregistered commercial name for material allegedly composed of the following mineral combination: amethyst, smoky quartz and cacoxenite. Another variation of Agape crystal® and related names…
Quantum Quattro
Commercial name for a combination of (smoky) quartz with chrysocolla, malachite, shattuckite and dioptase from Namibia. In the examples studied, the quartz, chrysocolla, malachite and…
Rainbow (Dali) jasper
Misleading commercial name for a red and white banded calcite; the stone contains no jasper or quartz at all. Inclusions of probably iron in the…
