the color of the powder produced when the mineral is rubbed against an unglazed porcelain plate or other fine-grained, hard, abrasive surface.
(the color of the powder; produced; T:when the mineral is rubbed against an unglazed porcelain plate or other fine-grained, hard, abrasive surface) (the mineral; is rubbed; against an unglazed porcelain plate or other fine-grained, hard, abrasive surface)
the color of the powder the mineral
produced is rubbed
T:when the mineral is rubbed against an unglazed porcelain plate or other fine-grained, hard, abrasive surface
against an unglazed porcelain plate or other fine-grained, hard, abrasive surface