Periclase
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Periclase: See Magnesia.
Petit Point: A stone shaped to a fine point which is usually somewhat larger than needle point and is characterized by being round, oval, or having one rounded end.
Synthetic periclase
A synthetic gemstone that resembles the natural periclase. It is almost colourless and has been produced by the flame fusion process with the Veneuil Furnace. A trade-name for one variety is 'Lavernite'.
Synthetic ruby ...
Magnesia: Also called periclase, magnesia is a light, solid, white earthy mineral composed of magnesium oxide. It is a source of magnesium and is used as a laxative.
Tiny black spots caused by undigested carbon inclusions (natts). Black material found within internal fracture planes can also be crystallographic inclusions of graphite, ferropericlase, pyrrhotite and pentlandite.
Piqué Carbon Inclusion Photos ...
The article points out that chalk dust with a hardness (H) of 3 has been found to abrade periclase (H: 5.5).
Periclase... see brucite
Peridot ...(see olivine) Occurrence: green type from Red Sea, Arizona Burma, etc.
Peridotite...pyroxenite
Colors: green, blue, black
Occurrence: world wide
Comments: a rock, a dunite
Perlite...
 See also: Crystal, Diamond, Crystals, Oxide, Iron
  
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