Shale Schist Phyllite Stones
Name and Composition - Shale and phylite are composed of argillaceous minerals like montmorillonite, illite etc. which are phyllosilicates. Schist mainly consists of mica, garnet, quartz etc. minerals.
Physical Properties - Shale is soft and splintery in nature, while schists/phylities through splintery, but hard in nature.
Mode of Occurrence - Shale occurs as almost sedimentary horizontally disposed bedded deposit while phylitie & schist are metamorphic rocks, having well developed cleavages with low to steep dips.
Uses - Schist & phylite are used as building stones mainly in roofing, paving, shelves; red shales are used as ochres/ pigment; white shales are used as clays.
Mineral based Industries – Edge cutting & greessing units. A few polishing units also exits.
Industrial Prospects – Processing/ dressing units.
Physical Properties
Hardness
Appearance
Fracture
Colour
Appearance
Fracture
Colour
1 to 2.5
Crinkled or Wavy
Conchoidal
Variable - black, shades of blue, green, red, brown and buff.
Crinkled or Wavy
Conchoidal
Variable - black, shades of blue, green, red, brown and buff.
Chemical Properties
Compound Content
Streak
Resistance
Grain size
Streak
Resistance
Grain size
CaO, Carbon Dioxide, MgO
White
Heat and water resistance
Very fine-grained; crystals not visible to the naked eye.
White
Heat and water resistance
Very fine-grained; crystals not visible to the naked eye.
Indian Minerals
Metallic Minerals
Cadmium Ore
Copper Ore
Lead Ore
Zinc Ore
Iron Ore
Manganese Ore
Tungsten Ore
Bauxite Ore
Limestone and Dolomite
Limestone
Dolomite
Fertilizer Minerals
Gypsum
Pyrite
Rock Phosphate
Saltpeter
Fuel Minerals
Lignite
Glass and Ceramic Minerals
Ball Clay
China Clay
Feldspar
Fire Clay
Kyanite
Quartz
Quartzite
Silica Sand
Precious and Semiprecious Minerals
Aquamarine
Emerald
Industrial Minerals
Asbestos
Barytes
Bentonite
Calcite
Fluorite
Fuller's Earth
Garnet
Graphite
Magnesite
Mica
Mill Stone
Ochre
Pyrophylite
Siliceous Earth
Silimanite
Soapstone
Vermiculite
Wollastonite
Dimensional and Building Stone
Granite
Limestone - Flaggy
Marble
Rhyolite
Sandstone
Serpentinite
Shale/Schist/Phyllite
Slate