Premium Black Granite
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Synonyms: Nero Assoluto Premium Indiano, Super Black
Location: Premium Black granite is quarried near Warrangal, Andhra Pradesh, India.
Description: Premium Black granite is an intense, dark black, very fine to close-grained black basalt (dolerite) with equi-granular crystalline texture. This stone internationally may be nominated as a granite howeverr in the area of application of the European Standard this stone must be nominated as a dolerite.
A small sample of Premium Black granite is usually representative not having a wide variation in colour and veining however swatch samples must be approved for large projects to ensure that the blocks are all extracted from the same quarry face for matching purposes. Ideal for both interior and exterior use, Premium Black granite is frost free and polish constant.
Description: Diabase - also called Dolerite: A fine to medium-grained, dark gray to black intrusive igneous rock. It is extremely hard and tough and is commonly quarried for crushed stone, under the name of trap. It makes an excellent monumental stone and is one of the dark-coloured rocks commercially known as black granite. Diabase is widespread and occurs in dikes (tabular bodies inserted in fissures), sills (tabular bodies inserted while molten between other rocks), and other relatively small, shallow bodies. Chemically and mineralogically, diabase closely resembles the volcanic rock basalt, but it is somewhat coarser and contains glass. With increase in grain size, diabase may pass into gabbro.
Description: Dolerite (Diabase, Microgabbro): A dark-coloured, medium-grained igneous rock which contains plagioclase feldspar of labradorite composition and pyroxene of augite or titanaugite composition as essential minerals, and magnetite, titano-magnetite, or ilmenite as accessory minerals. Where olivine also occurs as an additional mineral, the rock is termed an ‘olivine dolerite’. Where quartz occurs as an additional mineral in the groundmass, the rock is termed a ‘quartz dolerite’. Dolerites are the medium-grained equivalents of basalts and, like the basalts, can be divided into alkali and tholeiitic types. Dolerites are commonly found in shallow level intrusions such as dykes, sills, or plugs.