Group of five quartz spheres
Lot 1590
Group of five quartz spheres
Sold for US$ 480 inc. premium
Auction Details
Lot Details
Group of five quartz spheres
Brazil
This suite of five spheres illustrates some of the many colors and inclusion styles that can be represented in quartz. The first is a sphere of colorless transparent “rock crystal” quartz. A plane of small inclusion mark where a fissure in this had become healed naturally within the Earth, measures 2 ½ inches in diameter (6 cm) . Translucent rose quartz owes its color to tiny fibers of a dumortierite-like mineral. There are both clearer and cloudier areas in this deep pink, well-polished sphere; the rough is from Bahia, measures 2 ¾ inches in diameter (6 ½ cm) . Aventurine quartz is one of the rare natural materials to be named after an artificial glass. Supposedly, glassmakers in Murano, Italy, were trying to make red glass for stained glass windows by using copper instead of more expensive gold. Instead, they made orange “goldstone” glass flecked by small copper crystals. Since the glass was made by accident –per aventura–it was called “aventurine glass.” This green quartz rock, colored by flecks of chromium fuchsite mica, is called aventurine quartz due to its similar appearance. A vein of brassy pyrite blebs runs through the sphere, measures 2 ¼ inches in diameter (5 ½ cm) . Smoky quartz owes its brown color to exposure to radiation, although it is not itself radioactive. This pale brown sphere from Minas Gerais shows excellent transparency for the most part, with some very faint phantom zoning, measures 2 ½ inches in diameter (6 ½ cm) . The fifth rock crystal sphere contains bands of dull green chlorite flocking; this illustrates which side was up as the quartz crystal grew. Different layers of chlorite represent different precipitation events. The quartz crystal cracked at a later stage, and naturally healing of the fissure is the last geological event represented here. (5)
Measures 2 ¼ inches in diameter (5 ½ cm)

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