Baltic Brown Granite From Finland
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Description: Baltic Brown granite is a Commercial name for a brown-black granite (Rapakivi) with spherical shaped brown potassic feldspars of the Precambrian period. 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. During the polishing process a clear epoxy resin filler may be used to fill any micro fissures or tiny pitting however this does not affect the integrity of the stone, it merely provides an even smoother surface finish. Baltic Brown Granite is suitable for both interior and exterior use futhermore is frost resistant and with a constant polish.
Products: Suitable for construction projects both commercial and domestic, prefabricated countertops/worktops, vanities, tiles, backsplashes, paving, fireplaces and memorials.
Surface Finish: Baltic Brown Granite looks best with a gloss polished surface but is also available as honed, leather/satin, river-washed/antique, thermal/flamed, brushed and sandblast finish.
Sealing: Test with a small sample. It is most unlikely that a sealant can be used on Baltic Brown granite due to the grain formation, attempts at sealing it could actually create a residue film build-up.
Block Sizes: There are several different quarries of Baltic Brown granite ranging from light to dark and with differing background colours however all quarries yield selectable, grades of granite with blocks suitable for gangsaw size down to economical tile-sized blocks. For commercial projects it is important to ensure that blocks are selected from the same quarry face.
Rough blocks are usually exported by Break Bulk however intermodal containerisation is available at extra cost. Finished products are packed into sea-worthy wooden crates and loaded into containers.
Quarry Location: Baltic Brown granite is quarried near Savitaipale, Ylaemaa, Husu, Leppeeranta, Miehikkaelae, Finland, near to the border with Russia.
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.
Granite: A coarse or medium-grained intrusive igneous rock that is rich in quartz and feldspar; it is the most common plutonic rock of the Earth's crust, forming by the cooling of magma (silicate melt) at depth. The principal constituent of granite is feldspar. Both plagioclase feldspar and alkali feldspar are usually abundant in it, and their relative abundance has provided the basis for granite classifications. In most granite, the ratio of the dominant to the subdominant feldspar is less than two. Rocks containing less than 20 percent quartz are almost never named granite, and rocks containing more than 20 percent (by volume) of dark, or ferromagnesian, minerals are also seldom called granite. The minor essential minerals of granite may include muscovite, biotite, amphibole, or pyroxene. Biotite may occur in granite of any type and is usually present, though sometimes in very small amounts.
Rapakivi Granite: A hornblende-biotite granite containing large rounded crystals of orthoclase mantled with oligoclase. The name has come to be used most frequently as a textural term where it implies plagioclase rims around orthoclase in plutonic rocks. Rapakivi is Finnish for "crumbly rock", because the different heat expansion coefficients of the component minerals make exposed rapakivi crumbly.
Mineral Composition: Average Orthoclase: 55%, Quartz: 25%, Plagioclase: 11%, Amphibole: 9%
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/mC
Water Imbibition Coefficient: 0.003800
Impact Strength: 41.50 cm
Mass By Unit Of Volume: 2682 kg/m3
Hardness (Moh's Scale):
Note: These figures and details are given for guidance purposes only, no reliance should be taken as to their accuracy.