Silica Quartz is more exotic and colorful than granite and comes in many colours and patterns. The high purity quartz can be applied as crucibles for semi-conductor and solar, optical halogen lamps, quartz wool, quartz glass, fillers and silicon metal and refractory. Quartz stones offered by us are highly suitable for various commercial and residential applications. This stone is a natural choice for numerous top architects and designers as it brings in great attractiveness and beauty.
Quartzite generally comprises greater than 90% percent quartz, and some examples, containing up to 99% quartz, and are the largest and purest concentrations of silica in the Earth’s crust.
The variety of colours displayed by quartzite are a consequence of minor amounts of impurities being incorporated with the quartz during metamorphism.
Indonesian coal generally has medium calorific values (CV of 5,000 – 7,000 kcal/kg), with relatively high percentages of volatile matter. The coal has low ash and Sulphur content, making it some of the cleanest coal in the world and thus a more environmentally-friendly solution or blending material for coal-fired power plants.
We offer South African coal grade RB1, RB2 and RB3 direct from miners. We are offering high quality South African Coal that have been hardened, compacted, metamorphosed and chemically altered by heat and pressure. Our offered coal is processed using advanced techniques in compliance with the predefined industry standards.