Bahama Blue Granite
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Synonyms: Bahamas Blue, Bahamian Blue
Location: Bahama Blue granite is quarried near Vizag, Srikakulam, Andhra Pradesh, India.
Description: Bahama Blue granite is a blue-grey gneiss of the Precambrian period, with red-brown garnets. This stone internationally may be nominated as a granite but in the area of application of the European Standard this stone must be nominated as gneiss.
A small sample of Bahama Blue granite is not representative owing to the variation in colour and veining. 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, Bahama Blue is frost resistant with a constant polish.
Mineral Composition: Average by %:
Technical and Physical Characteristics:
Tensile strength after freeze-thaw cycles: 1590 kg/cm2
Unitary modulus of bending tensile strength: 111 kg/cm2
Water imbibition coefficient: 0.002250
Mass by unit of volume: 2623 kg/m3
Gneiss: A high grade metamorphic rock. This means that gneiss has been subjected to more heat and pressure than schist. Gneiss is coarser than schist and has distinct banding. This banding has alternating layers that are composed of different minerals. The minerals that compose gneiss are the same as granite. Feldspar is the most important mineral that makes up gneiss along with mica and quartz. Gneiss can be formed from a sedimentary rock such as sandstone or shale, or it can be formed from the metamorphism of the igneouse rock grantite. Gneiss can be used by man as paving and building stone.