The chrysanthemum stone is approximately 270 million years old. It is a dark grey to black limestone matrix with andalusite crystals taking on the appearance of a chrysanthemum and contains more than 10 kinds of trace elements, such as selenium, stronium, gold, silver & bismuth. The black rock itself is a piece of limestone.
 
Size of matrix: 5.8cm x 5.8cm
 
All measurements are approximate