Black and White agate with pockets of calcite and aragonite. Not as spectacular in daylight as Crazy Lace Agate [also from Chihuahua] but it more than holds its own when it comes to gentle pastel fluorescence. 2 pounds 12 ounces 4 1/2 x 3 1/2 x3 inches. ISO-100 f/11 2.5 seconds exposure for fluorescent pictures. Four SW pictures and a daylight one. LW and MW fluorescence dim.