Grape chalcedony from Sulawesi Indonesia
Size-
8cm x 4.3cm x 2.1cm
Weight-
52g
You will receive the item in the photo
Grape chalcedony is a fascinating mineral formation 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.