Natural Indian Minerals
Slate Stones

Name and Composition - A metamorphic rock of argillanceous composition.

Physical Properties - It is a fine grained, hard argillaceous metamorphic rock with varying colors and having perfectly splitable slaty cleavages. It is resistant to heat & cold.

Mode of Occurrence - Occurs as metamorphic rock.

Uses - Used as building stone for roofing, paving, shelves and decorative stone etc. due to its non-conductive nature, it is vastly used in cold regions/countries. Table tops of billiyard table are made of slate, small amount is used for manufacturing school slates.

Mineral based Industries – Cutting & dressing units, edge cutting units, and school slate manufacturing units.

Industrial Prospects – Cutting & dressing units, edge cutting units, school slate manufacturing units.

Physical Properties
Sp. gr.
Compressive strength
Modulus of rupture
Abrassion resistance to wear
2.5 to 4.0 on MOH scale
2.65 to 2.80
170 to 240 Kg/cm2
14 N/mm2
11.7 Avg. Wear mm
Chemical Properties
Water Absorption
Weather Impact
Grain size
1.2 % by weight
Low to very low
0.4 to 0.7%
Very fine-grained; crystals not visible to the naked eye.
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