Physically, these are Metamorphic-Argillaceous rocks, which has developed a well-marked splittable cleavages with or without developed recrystallization & spots/knots of minerals like garnet, pyrite, andulasite, etc. They are normally fine to medium grained, moderately hard & compact, less homogeneous with varying textures & shades. It has an ability to split into thin layers along the plane of cleavages due to flattened & elongated minerals along the plane of cleavage.
| Hardness | 3.0 to 4.0 on Moh's scale |
| Density | 2.6 to 2.8 Kg/cm3 |
| Modulus of Rupture | 22 to 34 N/mm2 |
| Compressive Strength | 24 to 36 N/mm2 |
| Specific Gravity | 2.65 to 2.80 |
| Porosity | Low to very low |
| Water Absorption | 1.5 to 2% |
| Weather Impact | Resistant |
| Corrodibility | 0.4 to 0.7% |
Chemically, they are Multi-Mineral, metamorphic argilaceous rocks made of an aggregate of minerals and colloidal substances. Essentially mineral composition includes quartz, mica, chlorite, sericite & oxides of iron with occasional spots/knots of minerals like garnet, pyrite, andulasite, etc.
| SiO2 | 55-65% |
| Iron (Fe2O3) | 4%-8% |
| Alumina (Al2O3) | 15 to 20% |
| Soda (Na2O) & Potash (K2O): | 2-4% |
| Lime (CaO) | 0.5-1% |
| Magnesia (MgO) | 0.5-3% |
| TiO2 | 0.4-0.5% |
| Loss On Ignition (LOI) | 3-4% |
Natural Mint Sandstone tiles, random crazy, pool coping and wall cladding...
Location : Australia
