Properties of Slate | Physical | Thermal Compare Rocks
Rocks are rated on the on the Moh''s Hardness Scale which rates the rocks on the scale from 1 to 10. Rocks with hardness 13 are soft rocks from 36 are medium hardness rocks and 610 are hard rocks. The hardness of Slate is 34 whereas its compressive strength is N/mm 2. Streak is the color of rock when it is crushed or powdered.