Virginia Mist Granite
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Synonyms: American Black, Black Virginia, Nero Virginia Mist, Virgin Black, Virginia Black
Location: Virginia Mist granite is quarried near Culpepper, Virginia, U.S.A.
Description: Virginia Mist granite is a fine grained, black, soft grey banded or clouded gneiss. 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 a gneiss.
The veining and colour varies considerably and a small sample of Virginia Mist granite may not be representative of the whole slab therefore 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, Virginia Mist granite is frost free and polish constant.
Mineral Composition: x
Technical and Physical Characteristics:
Compression tensile strength: 2823 kg/cm2
Tensile strength after freeze-thaw cycles: 2636 kg/cm2
Unitary modulus of bending tensile strength: 280 kg/cm2
Water imbibition coefficient: 0.000100
Impact strength: 69 cm
Mass by unit of volume: 2989 kg/m3
Gneiss: A common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks. Gneissic rocks are usually medium to coarse-foliated and largely recrystallized but do not carry large quantities of micas, chlorite or other platy minerals. Gneisses that are metamorphosed igneous rocks or their equivalent are termed granite gneisses, diorite gneisses, etc.