Striped Chalcedony is a type of cryptocrystalline quartz, which is composed of very fine intergrowths of quartz and moganite. It is usually found in shades of white, gray, blue, and pink. The two crossword solutions for this term are ONYX and AGATE. ONYX is a type of cryptocrystalline quartz that is usually black or dark brown in color. AGATE is a type of cryptocrystalline quartz that is usually found in a variety of colors, including red, yellow, and blue.