Studio : Rockhound's 1st Choice

Publisher : Rockhound's 1st Choice

Binding : Toy

Product Description
In general, chalcedony forms by filling cavities in rocks. Such cavities may form as gas bubbles in a lava flow; irregular vugs or open space within a solid rock; or horizontal cavities along bedding planes, that result from solution of the preexisting rock, faulting or movement within the rock, or other geologic processesChalcedony is best described as a dense, semitransparent or translucent variety of SiO2 consisting of a cryptocrystalline intergrowth of mostly quartz and lesser amounts of moganite, another form of SiO2 that has a different crystal form. Chalcedony breaks with a conchoidal fracture and commonly displays a waxy, vitreous, or silky luster. Minute changes in amount of impurities in the silica-rich solutions can result in faint color banding or layering in the Chalcedony.See images above for random examples.This bag weighs 8 oz. and will contain an average of 9-15 pieces. Great refill for any beginner-novice tumblers, i.e., NSI, National Geographic, Dr. Cool, Smithsonian, Elenco Pro Models Lortone, Chicago Others. NOTE* This Bag DOES Not contain Grits, Findings, jewelry parts,or adhesives that may have been included with the original tumbler accessories. WARNING-Choking Hazard! Use Tumbling instructions from the tumbler manufacturer.
0