ABSTRACT

Twenty-six elements in agate which is shaped into an agate mortar are examined. The agate contains impurities less than ppm level for most of the elements examined except for Na, K, and Fe. The elemental concentration levels are significantly low as compared with common crustal materials. Agate mortars are good enough to grind common crustal materials, but may give a little contamination for some elements when the element concentrations in samples are smaller than those in the agate.