| ROCK - DESCRIPTION | APPROXIMATE – ROCK HARDNESS | Cut and Grind Tools |
|---|---|---|
| Conglomerates Hard Shales Limestone Sandstone | Extremely Abrasive Broken Faulted Coarse Grained | C - 1 |
| Conglomerates Hard Shales Limestone Sandstone | Very Abrasive Fractured Medium - to Coarse Grained | C - 2 |
| Dolomite Weathered – Granite Peridotite | Abrasive Medium - to Coarse Grained Solid to Fractured |
C – 3B C - 5 |
| Basalt Diorite Diabase Gabbro Rhyolite | Moderately -Abrasive Fine to Medium Grained Solid | C – 6 C – 6.5 |
| Pegmatite Feldspar Quartz Granite Skams Volcanics | Medium to Coarse Grained Slightly - Abrasive Medium - to Hard | C – 7A C – 7M |
| Diorite Gneiss Quartzite Granite | Solid to Formation Hard to very Hard | C – 8G |
| Diorite Gneiss Quartzite Granite | Fine Grained. Non Abrasive - Hard to Very Hard |
C – 9R C -10 |
| Jasper Chert Banded iron Stone Glassy Quartzite | Very Fine Grained Solid. Extremely Hard Hard - Non Abrasive | C – 14 |