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Physical Properties of Slate

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Hardness2.5 to 4.0 on Moh's scale
Modulus of Rupture450 to 850 Kg/cm2
Compressive Strength170 to 240 Kg/cm2
Specific Gravity2.65 to 2.80
PorosityLow to very low
Water Absorption1.0 to 1.5%
Weather ImpactResistant
Corrodibility0.4 to 0.7%

CHEMICAL PROPERTIES OF SLATE
Chemically they are Multi-Mineral rocks made of an aggregate of minerals and colloidal substances. Essentially mineral composition includes members of Mica group commonly sericite & muscovite, Clay group commonly paragonite, chlorite & kaonilite. The accessory minerals are oxides, calcites & minor amounts of quartz and feldspar along with subordinate amounts of ferromagnesian minerals. Free silica is normally poor. It is resistant to acids and staining.

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