Grape (Botryoidal) chalcedony

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Grape (Botryoidal) chalcedony from Sulawesi Indonesia Size-15cm x 9.7cm x 8.7cm Weight-686g You will receive the item in the photo Grape chalcedony is a fascinating mineral formati on of purple and green Botryoidal grape like chalcedony. The crystals forms as tiny spherical aggregates of microcrystalline quartz. The grapes are actually tightly packed naturally rounded nodules.The hardness is 7 on the MOHs scale Mineral class is silicate (a crypto crystalline/microcrystalline form of quartz or silica.Crystal system is trigonal.Often forms in volcanic environments. Show more