Pumice has a chemical composition similar to that of obsidian, or volcanic glass. There are various physical properties of Pumice like Hardness, Grain Size, Fracture, Streak, Porosity, Luster, Strength etc which defines it. Physical properties of rocks play an important role in determining its applications in various fields. The physical properties of Pumice rock are vital in determining its Pumice Texture and Pumice Uses. It is stable and can be reused practically indefinitely. Composition of Pumice. Get to know information about Pumice texture and also know all about Pumice Color. Marble. Get to know information about Pumice texture and also know all about Pumice Color. Pumice, called pumicite in its powdered or dust form, is a volcanic rock that consists of highly vesicular rough textured volcanic glass, which may or may not contain crystals. Density. The physical properties of Pumice rock are vital in determining its Pumice Texture and Pumice Uses. A.L. Pumice is very lightweight. The physical properties of Pumice depend on its formation. Pumice is pyroclastic igneous Sandstone. Coal. Quartzite. Metamorphic Rocks + Schist. Chemical Composition of Pumice, Expressed as Oxides (%) Oxide SiO 2 Al 2 O 3 CaO MgO Fe 2 O 3 Na 2 O K 2 O; Percent: 70–75: 12–14: 1–3: 0.1–0.6: 0.8–2.0: 3–6: 4–5: Sterilization, Reuse, and Waste Disposal—Pumice is biologically inert and contains no pathogens or weeds (Challinor, 1996). Pumice is composed of highly microvesicular glass pyroclastic with very thin, translucent bubble walls of extrusive igneous rock. It commonly forms as a frothy upper surface on silicic lavas. Texture: aphanitic and vesicular (contains abundant small gas cavities) Composition: felsic (rhyolitic) Color: white to light-gray or light-tan Cooling Rate: rapid, extrusive; Intrusive Equivalent: granite Fossil Rocks + Novaculite. Most pumice erupts from magmas that are highly charged with gas and have a rhyolitic composition. Pumice, a very porous, frothlike volcanic glass that has long been used as an abrasive in cleaning, polishing, and scouring compounds. This is due to the air bubbles in it, created as gasses departed during the formation process. Igneous Rocks-Shonkinite. Hardness and Strength of Pumice. 1.4 Pumice and Pumicite. It is commonly,but not exclusively of silicic or felsic to intermediate in composition (e.g., rhyolitic, dacitic, andesite, pantellerite, phonolite, trachyte), but basaltic and other compositions are known. Scoria is another vesicular volcanic rock that differs from pumice in having larger vesicles, thicker vesicle walls and being dark colored and denser. Pumice and pumicite are used both as structural lightweight aggregates and as ultralightweight aggregates. Texture: aphanitic and vesicular (contains abundant large gas cavities) Composition: intermediate (andesitic) to mafic (basaltic) Color: black or dark brown. Pumice stones as used in beauty salons are generally high in silica and low in iron and magnesium. Texture and Composition of Pumice and Scoria Provide New Insights into the Dynamics of Explosive Eruptions at Campi Flegrei (Italy) Intrusive Equivalent: diorite or gabbro. It is typically light colored. Bush, in Encyclopedia of Materials: Science and Technology, 2001. Hardness and Strength of Pumice. PUMICE. Rarely, pumice can erupt from gas-charged magmas of basaltic or andesitic composition. Comendite. They are lighter colored, of lower density, and more highly cellular than are scoria and cinder. Pumice is a low-density, light-colored felsic volcanic rock. Basaltic Trachyandesite. It has very thin, translucent bubble walls of extrusive igneous rock. Origin: Extrusive/Volcanic Pumice is created when super-heated, highly pressurized rock is … It is commonly pale in color, ranging from white, cream, blue or … Home. Cooling Rate: rapid, extrusive. Other Characteristics: vesicular like pumice, but denser and darker with larger vesicles. It is also employed as a lightweight aggregate in precast masonry units, poured concrete, insulation and acoustic tile, and plaster. The physical properties of Pumice depend on its formation.
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