Emerald Pearl Granite
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Synonyms: Dunkel Labrador, Emerald Perl, Esmerald Pearl, Labrador Dunkel, Labrador Emerald Pearl, Labrador Escuro, Labrador Gruen, Labrador Oscuro, Labrador Scuro, Labrador Verde, Labrador Vert, Perla Smeralda, Verde Larvik
Location: Emerald Pearl granite is quarried near Klaastad, Larvik, Norway with current production of 8-10,000 m³ per year and a potential of 16,000 m³ per year.
Description: Emerald Pearl granite is Commercial name for a blue-green syenite (larvikite) of the Permian period. The iridescence on the polished surface results of the reflection of light at the feldspar crystals. 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 syenite.
A small sample of Emerald Pearl granite is usually representative not having a wide variation in colour and veining however 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, Emerald Pearl granite is frost free and polish constant.
Mineral Composition: Biotite, Augite, Olivine, Nepheline, Hemo-ilmenite, Apatite, Magnetite, Hematite.
Technical and Physical Characteristics:
Bending strength: 12.4-17.5 N/mm²
Resistance to wear: 11.9-14.1 mm
Dynamic Elastic Modulus: 61841-83974 10³N/mm
Hardness (MOHS): 6-6.5
Apparent Density: 2702-2775 kg/m³
Porosity: 0.03-0.24 volume %
Water Absorbtion: 0.01-0.09 mass %
Compressive Strength: 157-241 N/mm²
Larvikite: An igneous rock, a variety of the rock monzonite. It is noted for its interlocking crystals of feldspar. The feldspar is perthitic, and the alternating alkali feldspar and plagioclase layers give these crystals their characteristic silver blue sheen (or Schiller effect) on polished surfaces. Olivine can be present along with titanian augite, titanian magnetite, apatite, and sometimes quartz.
Monzonite: An intermediate igneous intrusive rock composed of approximately equal amounts of sodic to intermediate plagioclase and orthoclase feldspars with minor amounts of hornblende, biotite and other minerals. Quartz a minor constituent or is absent; with greater than 10% quartz the rock is termed a quartz monzonite. If the rock has more orthoclase or potassium feldspar it grades into a syenite. With an increase of calcic plagioclase and mafic minerals the rock type becomes a diorite.
Quartz Monzonite: (Or adamellite) is an intrusive igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars. The plagioclase is typically intermediate to sodic in composition, andesine to oligoclase. Quartz is present in significant amounts. Biotite and/or hornblende constitute the dark minerals. Quartz monzonite porphyry is often associated with copper mineralization in the porphyry copper ore deposits. Because of its coloring, it is often confused with granite, but whereas the mass of granite is 20% quartz, quartz monzonite is only 5-20% quartz.
Syenite: A coarse-grained intrusive igneous rock of the same general composition as granite but with the quartz either absent or present in relatively small amounts (<5%). The feldspar component of syenite is predominantly alkaline in character (usually orthoclase). Plagioclase feldspars may be present in small quantities, less than 10%.