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  2. Quartz Grinder Mill Hardness 9 In Mohs Scale

Quartz Grinder Mill Hardness 9 In Mohs Scale

Stones with hardness’s of under 4 may not polish at all or will only take a light shine. It should be noted that some stones have certain textures, grains or combinations of hardness’s which will make it challenging to get a high polish. Jade is a good example of this. Rocks with hardness’s of 9 or above are very difficult to tumble.

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