Grape Agate Botryoidal Purple Chalcedony #03

263g / 0.580 lbs / 9.28 oz 4.09" x 2.73" x 2.30 Although the trade name is Grape Agate, these are Botryoidal Purple Chalcedony. Botryoidal means that round tiny sphere-shaped crystals that have naturally formed together. Chalcedony is a silicon dioxide mineral that is composed of sub-microscopic particles of Quartz arranged in fibrous layers. The color ranges from mid to deep purple, often pieces can also have a greyish or greenish tinge to the small orbs.