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Book Two in The Chalcedony Chronicles is a Fast-Paced Time Traveling Adventure WORTHINGTON, Ohio, Aug. 28, 2014 /PRNewswire-iReach/ -- B.
Quartz is the second most abundant mineral in the Earth's crust. It has a hexagonal crystal structure made of trigonal crystallized silica (silicon dioxide, SiO2), with a hardness of 7 on the Mohs scale. Density is 2.6 g/cmÂ³. The typical shape is a six-sided prism that ends in six-sided pyramids, although these are often distorted, or so massive that only part of the shape is apparent from a mined specimen. Additionally a bed is a common form, particularly for varieties such as amethyst,...
- A transitional zone between two communities containing the characteristic species of each.