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This description includes all the crystal’s visible characteristics, general shape, and its crystallographic forms, as well as how developed each form is.   In mineralogy, shape, and size give rise... Read More

  According to the maximum symmetry of their faces; the systems are cubic (isometric), hexagonal/trigonal (regarded as a single system), tetragonal, orthorhombic, monoclinic, and triclinic. Each system is defined by... Read More

The custom of wearing birthstone jewelry became fashionable in Poland in the fifteenth or sixteenth century. But its origins, most gem scholars agree, is associated with the Breastplate of Aaron... Read More