Strange rock (Mining)

Strange rocks obtained by training Mining are part of the Dahmaroc statue. 2 are required each to complete the statue each week. Strange rocks may be stored inside a statue collection bag.

Obtaining
Mining ore, coal, granite, clay, stone, gems or rune essence (recommended); mining in the Living Rock Caverns (coal and gold; also recommended), mining in Miscellania. Mining in the Lava Flow Mine and at Seren stone also works.

It does not matter what is mined. You have a chance to get a rock every animation.