ETYMOLOGY: Its name derives from Khalkedon an ancient Greek and Byzantine city, located on the Asian side of the Bosphorus in the region.

CRYSTAL SYSTEM: Trigonal.

PRINCIPLE OF FORMATION: Primary.

MINERAL CLASS: Oxide, quartz group.

CHEMICAL FORMULA MINERAL ELEMENTS: Oxide, quartz group.

Hardness: 6.5 - 7 on the Mohs scale.

FIEDS: Galicia, Aragon, Morocco, Brazil, Uruguay, USA

MINERALOGY: The flowers of chalcedony concretions are formed slowly in long fissures of basalt formations, so have a flattened appearance. Have a nodule, of spherical shape can vary in color between white, yellow or gray. Since this node rugged blue-gray surfaces are formed, or may be formed concentric bands of dark colors or white. These rough, flat or concave surfaces create calls chalcedony flowers.

MYTHOLOGY: Since ancient chalcedony represented the air and water elements. As such I was used as a magical symbol of time and to deal with climate-related diseases (colds, circulatory problems) since ancient times is considered the mineral of the speakers. The fibrous structure gives chalcedony and hardness makes it ideal for carving.

PROPERTIES: It is the stone of generosity. Harmonizes body and mind. It is the stone of maternal love, serenity and creativity, enhances the ability to listen and understand, promotes the joy of contact with others, chalcedony is a mineral that conveys optimism.

CHAKRAS: Brow, heart and crown.

ZODIAC SIGN: Sagittarius, Aries, Libra and Gemini.

USES: Meditation, jewelry, collection.