Grape Agate Botryoidal Purple Chalcedony #05

335g / 0.739 lbs / 11.82 oz 5.34" x 3.28" x 3.30 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.