In unusual circumstances, minerals may grow into typical crystal forms that make them desirable to collectors. Rocks of Pennsylvanian age in eastern Ohio are known for hematite nodules, petrified wood, and ironstone septarian concretions. (List by state or year) State Name Designated as Year Alabama Star Blue Quartz Official gemstone 1990 Alaska Jade This gray-colored heavy mineral is an ore of lead. Ohio--The Buckeye State - Take Quiz Now [Average score: 9 out of 15]. Quartz – Silicon dioxide. The state of Ohio declared flint as the official gemstone in 1965. Marcasite – Iron sulfide. Calcite is common as vein fillings in many rocks in western and central Ohio. In recent years, diamond-bearing kimberlite pipes have been discovered in the Canadian shield and they may have been the source for rare Ohio diamonds. Large quantities of this gem exist, especially in the eastern and central parts of the state. To … Ohio is an area in the state fact, flint spectacular specimens of Ohio an. 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