Baltic Brown Granite
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Synonyms: Baltic Braun, Baltic Brovn, Baltic Brun, Baltik Braun, Brown Baltic, Bruno Baltico, Castanho Verdoso, Coffe Diamond, GA 501, Kugelgranit, Marron Baltico, Marrone Baltico, Rapakiwi-Granit, Ylaemaan Ruskea
Location: Baltic Brown granite is quarried near Savitaipale, Ylaemaa, Husu, Leppeeranta, Miehikkaelae, Finland, near to the border with Russia.
Description: Baltic Brown granite is a Commercial name for a brown-black granite (Rapakivi) of the Precambrian period. Spherical shape of the brown potassic feldspars. This stone internationally may be nominated as a granite and in the area of application of the European Standard this stone must be nominated as granite. Ideal for both interior and exterior use, Baltic Brown is frost resistant with a constant polish.
There are several different quarries of Baltic Brown granite ranging from light to dark however a small sample of Baltic Brown granite is usually representative with each quarry not having a wide 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, Baltic Brown is frost resistant with a constant polish.
Mineral Composition: Average by %: Orthoclase: 55%, Quartz: 25%, Plagioclase: 11%, Amphibole: 9%
Technical and Physical Characteristics:
Compression tensile strength: 1578 kg/cm2
Tensile strength after freeze-thaw cycles: 1599 kg/cm2
Unitary modulus of bending tensile strength: 104 kg/cm2
Heat expansion coefficient: 0.0013 mm/m°C
Water imbibition coefficient: 0.003800
Impact strength: 41.50 cm
Mass by unit of volume: 2682 kg/m3
Granite: Granite is a common and widely occurring type of intrusive, felsic, igneous rock. Granites are usually medium to coarse grained, occasionally with some individual crystals larger than the groundmass forming a rock known as porphyry. Granites can be pink to dark grey or even black, depending on their chemistry and mineralogy.