Verde San Francisco Granite
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Synonyms: Granit Green Sao Francisco, Green S. Francisco, Green Sapoti, Gruen San Francisco, San Francisco Green, San Francisco Gruen, Sao Francisco Green, Sapoti, Sapoti Green, V. S. Francisco, Verde S. Francisco, Verde Sapoti, Verde San Franzisko, Verde Sao Francisco, Verdi San Francisco, Vert San Francisco
Location: Verde San Francisco granite is at quarry RN 000151, Fazenda Caete, Sao Francisco de Paula, Minas Gerais, Brazil.
Description: Verde San Francisco granite is a fine-grained, greenish-grey gneiss (metatexite) of the Precambrian period. 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 a gneiss.
The veining and colour varies considerably and a small sample of Verde San Francisco 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, Verde San Francisco granite is frost free and polish constant.
Mineral Composition: Microperthitic Microcline: 40%, Quartz: 25%, Oligoclase: 25%, Biotite+Chlorite+Clay Minerals: 10%.
Technical and Physical Characteristics:
Compression tensile strength: 2607 kg/cm2
Tensile strength after freeze-thaw cycles: 1973 kg/cm2
Unitary modulus of bending tensile strength: 134 kg/cm2
Water imbibition coefficient: 0,002300
Mass by unit of volume: 2751 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.