Group of seven opaque polished spheres
Lot 1594
Group of seven opaque polished spheres
Sold for US$ 240 inc. premium
Auction Details
Lot Details
Group of seven opaque polished spheres
Various localities
“Paesena” marble is a tan stone from Florence, Italy, which was brecciated and forms natural scenes and images. It is frequently used in mosaic inlays. These two spheres represent different degrees of brecciation, as well as the presence of manganese-oxide dendrites along some fracture surfaces, diameters 3 ½ and 3 inches in diameter (9 and 7 ½ cm); a dark gray limestone sphere from Guizhou Province, China, shows thick white shells and later infilling and recrystallization. The fossils are Triassic in age. measures 2 ¾ inches in diameter (7 cm) ; rhyolite is a siliceous igneous rock, usually formed from solidified volcanic ash flows; fine-grained rhyolite grades into jasper. This sphere from Madagascar is colored in grays, browns, and mysterious greens. Circular features in the gray layer resemble an approaching ash cloud, measures 2 ¼ inches in diameter (6 cm) ; some rubies in Mysore, India, are found with blue kyanite rims in a matrix of green fuchsite mica. Such material is represented in these two polished spheres, with ruby grains reaching ½ inch (1 cm) across and nearly 1 inch (2 cm) long. Some of the rubies show elongated crystal shapes, or hexagonal cross-sections, diameters: 2 ¼ and 2 inches (5 ½ and 5 cm) . There is a lot of history represented in the last sphere in the group, a brecciated jasper from Namibia. First iron-rich dark red jasper was deposited, possibly from tiny silica-shelled organisms such as radiolarians. Then this material was broken into fine shards, or brecciated, and deposited in pinkish tan jasper. The material was brecciated again, and fine quartz crystals filled in the voids in the rock. Measures 2 ¼ inches in diameter (5 ½ cm) (7)

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