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 chalcedony is a microcrystalline variety of silicon dioxide, it is a translucent milky blue agate. It forms in rock cavities of different type, particularly wash, The various types of color are by pink metal, such as iron, nickel, copper, and titanium impurities, present during crystallization, this case makes it white or the manganese content.

MYTHOLOGY: It is said that the white chalcedony stimulates milk production in lactating women.

PROPERTIES: Provides liveliness, friendliness, cooperation, promotes tenderness and helps us to be more flexible mentally.

CHAKRAS: Heart.

ZODIAC SIGN: Sagittarius, Aries, Libra and Gemini.

USES: Meditation, jewelry, collection.