Mill Stone Minerals
Name and Composition - There are hard massive silica rich rocks. Generally quartzites/sandstones and hard garnet-biotite-quartz schists/gneisses are preferred for this purpose.
Physical Properties - These are fine granined, hard and compact grey coloured, massive garnet-biotite-quartz-schists/gneisses or grey to red coloured quartzites sandstones.
Mode of Occurrence - As bedded sedimentary deposits (sandstone); metamorphic argillaceous rocks (garnet-biotite-quartz schists/gneisses) or quartzites.
Uses - In preparing round slabs (pats) for crushing and grinding in flour mills and domestics house chakkies.
Mineral based Industries – Only cottage industries (artisam work) preparing pats/round slabs for flour mills/domestic atta chakkies.
Industrial Prospects – local level cottage industries (artisan work) for preparing pats/rounds slabs for flour mills /domestic atta chakkies.
Physical Properties
Hardness
Sp. gr.
Density
Sp. gr.
Density
5 to 6.5
4.8 to 4.9
6.65 g/cm3
4.8 to 4.9
6.65 g/cm3
Chemical Properties
Composition
Siliceous rock
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