No Comments

Pellet

A small globular piece of fused metal or metals, usually 1 cm. in diameter

No Comments

Pegmatite

An igneous rock, similar to granite, having a coarse irregular texture. Pegmatites are a common host of minerals and specifically a priority target for well formed crystal minerals such as corundum and tourmaline

No Comments

Peat moss

Any type of moss which has formed on peat as its substrate

No Comments

Peat

An accumulated mass of decayed or partially decayed plant matter

No Comments

Phase

The sum of homogenous material within a larger heterogeneous material body

No Comments

Permian period

The period 280 to 245 million years ago, followed by the Mesozoic era. Known as the age of amphibians

No Comments

Petrification

The replacement of minerals in organic matter by calcareous, carbonaceous or siliceous minerals, which serve to solidify and preserve the form of the matter beyond its organic state

No Comments

Permafrost

A depth of the earth’s surface or subsurface which is permanently frozen.

No Comments

Peridotite

Intrusive igneous rock formed within olivine, the source of Peridot