(in opal mining) very hard, brittle rock that splinters easily.
in a hole of that depth you would first sink through about 10 or 12 feet of shin-cracker
Example sentencesExamples
- Her face was the colour of shin-cracker.
- Hardened claystone, similar to the shin-cracker of Lightning Ridge, has inhibited exploitation of the area.
- The biggest problem was the first three feet of shin-cracker.
- Black opal is found in the sandstone and dirt underlying the shin-cracker.
- Beneath the weathered quartzite or shin cracker were layers of soft, porous sandstone.