Minerals "Amethyst & Agate"
Soledade, Rio Grande do Sul, Brazil, private collection from Netherlands.
Amethyst is a violet variety of quartz. The name comes from the Koine Greek amethystos (αμέθυστος) from α- a- "not" and Ancient Greek methysko (μεθύσκω) "intoxicate", a reference to the belief that the stone protected its owner from drunkenness. Ancient Greeks wore amethyst and carved drinking vessels from it in the belief that it would prevent intoxication. When heated to more than about 300-400°C, amethyst loses its violet color and often turns yellow, orange or brown, and then resembles the quartz variety citrine, but depending on the locality and the temperature during the heat treatment it may also turn colorless or rarely green. Often incorrectly sold as citrine.
Agate is a common rock formation, consisting of chalcedony and quartz as its primarily components, consisting of a wide variety of colors. Agate's geodes form when gas bubbles are trapped in solidifying lava. Agate is identical with quartz in composition and physical properties. The ornamental use of agate dates back to Ancient Greece in assorted jewelry and in the seal stones of Greek warriors. Use of beads necklaces with pierced and polished agate goes further back to 3000 BC in the Indus Valley Civilisation.
Beautiful, small-sized burnt amethyst cluster fragments and small cut agate geode half are in good condition. Gorgeous pale light yellow and burnt reddish brown color. Dirt and dust may exist. Size varies from approx. 6,0cm to 3,5cm. Total weight c. 120g.