Rock Abrasiveness Chart

Overburden Soft & Extremely Abrasive
Hole Obstructions Soft & Extremely Abrasive
Abrasive Sandstone Soft & Extremely Abrasive
Broken Abrasive Rock Types Medium & Highly Abrasive
Sandy Shale Medium & Highly Abrasive
Pyroxenite Medium & Highly Abrasive
Norite Medium & Medium Abrasive
Gabbro Medium Moderately Abrasive
Diabase, Dolerite Medium Moderately Abrasive
Mica Schist Medium Moderately Abrasive
Siltstone Medium Moderately Abrasive
Granite Med-Hard Moderately Abrasive
Basalt, Gneiss Hard & Slightly Abrasive
Hard Quartzite Hard & Slightly Abrasive
Quartz Conglomerite Hard & Slightly Abrasive
Banded Ironstone Hard & Slightly Abrasive
Chert Hard & Non - Abrasive

 

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