Oco Agate Chalcedony Quartz Geode - Window Agate - Quality 1 Tumbled Stones - Medium 25 - 40 mm - 1 lb - Brazil - NEW122 - Release your innermost dreams or sorrows to the Universe. K9 Crystals This luminous streak moves as

This luminous streak moves as you rotate the stone

SiO2) Molar mass: 60 g / mol Crystal system: Trigonal Cleavage: Absent Fracture: Uneven

With eye-catching bursts of color in yellow and red

It is also a common constituent of schist

Oco Agate Chalcedony Quartz Geode - Window Agate - Quality 1 Tumbled Stones - Medium 25 - 40 mm - 1 lb - Brazil - NEW122 - Release your innermost dreams or sorrows to the Universe. K9 Crystals This luminous streak moves asOco ( aka Occo or Ocho Agate) are found in Brazil, and are normally quite small, with a diameter of . 5 3 inches. They are a mix of chalcedony and quartz, which gives them their unique appearance.