approx 17" by12.5" I have a variety of sizes Black and natural inquire within ShivaLingham is symbolic of the DIVINE CREATIVE MANIFESTATION shape represents power of Shiva the lord of creation,the masculine creative energy.The markings: ALSO KNOWN AS THE YONI; symbolizes female energy, the seed which is fertilized to manifest the creative dance of the cosmos . Represents the harmony and balance in all us, the light tha shines from within us. GEOLOGIST THEORIZE that the iron oxide of which yoni is composed ,was impregnated in the river bed millions of years ago by a meteorite. ONLY FOUND IN THE NARAMATA RIVER IN INDIA only picked by a handful of families and the dam is now closed