
MINERAL
A naturally formed part of the earth's crust that is uniform in itself. Example: quartz, mica, feldspar.
CRISTAL
A solid whose constituent particles (atoms, ions or molecules) are arranged in a strict order as a crystal lattice. Naturally formed crystals are minerals. Example: Rock crystal
STONE
Natural mixture of different or similar minerals. Example: granite, gneiss or marble, dolomite.
PRECIOUS STONE
Mostly minerals but also organic or synthetic products. They all have something special, something beautiful in common. Example: diamond, amber



