Natural Indian Minerals
Rhyolite Stones

Name and Composition - Similar to granites but somewhat richer in silica. Mainly comprises assemblage of quartz-feldspar as main minerals and biotite, muscovite, amphbloles etc. as accessory minerals.

Physical Properties - Reddish to grey coloured, fine granied to glassy acid volcanic rock.

Mode of Occurrence - Occurs in the form of mounds, sheets etc.

Uses - Rhyolite is used as road ballast, chips and masonary stone. Small khandas can be used for extraction of slabs/tiles.

Mineral based Industries – Crushing plants for road ballast and chips.

Industrial Prospects – Crushing Units, small scale tiling plants.


Physical Properties
Hardness
Sp. gr.
Water absorption
Density
Compressive strenght
Modulus of rupture
4 to 4.5
2.60
1.25 %
2.51 g/cm3
390 Kg/cm3
220 Kg/cm3
Chemical Properties
Lime (CaO)
Silica (SiO2)
Alumina (Al2O3)
Ferric Oxide (Fe2o3)
Manesium Oxide (MgO)
Loss On Ignition (LOI)
0.28 to 0.32%
90 to 95%
2 to 3%
1.20 to 1.4%
0.20 to 0.30%
0.50 to 0.60%
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