basalt properties hardness mohs
The hardness of a mineral relates to its resistance from abrasion, and is defined in terms of Mohs hardness scale. 5 Apatite, 6 Feldspar (some river rock, some type of granite), 7 Quartz (some river rock, some types of granite, basalt, quartz, trap rock), 8 Topaz, 9 Corundum (flint, chert, trap rock, basalt. Mohs degree of hardness basalt