The term 'striped stone' can refer to two different types of stones: ONYX and AGATE. ONYX is a type of quartz that is usually black and white in color, with alternating bands of the two colors. AGATE is a type of quartz that is usually found in a variety of colors, including red, blue, and yellow. It often has stripes or other patterns in its surface. Both ONYX and AGATE are popular stones used in jewelry and decorative items.