The word "jasper" is derived from the Greek word iaspi meaning "spotted...

Pegmatite is an igneous rock, formed underground, with interlocking crystals usually larger...

Petalite, also known as castorite, is a  lithium aluminium phyllosilicate mineral LiAlSi4O10,...

Petoskey stones are older than the dinosaurs, which roamed the earth beginning...

Petrified Peanut Wood Stone from Australia shaped and polished into a cabochon. ...

The composition of Phosphosiderite is its namesake after phosphorous and the Greek...

This crystal is a type of marble and its name originally came...

Pietersite is a rare dark-gray or reddish breccia aggregate (rock made up of...

Pink Opal is a sedimentary rock formed at low temperature from an...

Plasma agate is a fairly rare material found in the Clear Creek...

Polychrome Jasper, also known as Desert Jasper, is a variety of Jasper...

Poppy Jasper is a variety of Jasper which contains variably-colored orbs or spherical...

Jasper, an aggregate of microgranular quartz and/or chalcedony and other mineral phases,...

Prehnite is an inosilicate of calcium and aluminium with the formula: Ca2Al(AlSi3O10)(OH)2. Limited...

Priday Moss Agate is a truly remarkable variety of agate, highly prized...

Psilomelane is a group name for hard black manganese oxides including hollandite...

Puddingstone is a popular name applied to a conglomerate that consists of distinctly...

Purpurite is a mineral, manganese phosphate, MnPO4 with varying amounts of iron depending...

Pyrite agate is chalcedony (agate) with pyrite inclusions.  An inclusion is any...

Quartz is a mineral composed of silicon and oxygen atoms in a continuous...

Quartzite is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone....

Rainbow calsilica is a man-made material created for the gemstone market from...

Rainbow Petrified Wood is good for grounding and stabilizing one's emotions. It...

Rhodochrosite is a manganese carbonate mineral with chemical composition MnCO3. In its...