gan1
a rock or cliff

strokes 8
radical
strokes after radical 3
矸石 矸石 gan1 shi2
waste rock (mining); gangue (worthless minerals mixed in with coal or ore)

矸子 矸子 gan1 zi5
waste rock (mining); gangue (worthless minerals mixed in with coal or ore)

煤矸石 煤矸石 mei2 gan1 shi2
waste rock (in coal mining)