reumatik

Jasper has more than eighty specimens. Most often they are red, but they can also have other colors and different patterns.

Rock crystal is a colorless variation of thick quartz.

There was a rich hematite site on the island of Elba, Italy. Etruscan people have dug this important ore. Today, hematite is a common ornamental stone. It is separated from the synthetic by the fact that

Silver is used for jewelry, in the manufacture of coins, mirrors and various scientific equipment. Its surface oxidizes and therefore darkens or silver sulfur acanthite is eliminated on the surface due

Gold is naturally in the form of scattered particles of microscopic dimensions, or it is admired in crystals visible to the naked eye. It can also be in the form of branched crystals, wires or nugget.