Limestone rock<\/i> is composed of medium particle sizes and is derived from calcite. Limestone can be clastic with particles of any size and it can also be chemical.\u00a0 It is a sedimentary rock composed principally of calcium carbonate (calcite) or the double carbonate of calcium and magnesium (dolomite). \u00a0It is commonly composed of tiny fossils, shell fragments and other fossilized debris. \u00a0These fossils are frequently visible to the unaided eye on close examination of the stone surface. \u00a0Limestone coloration is generally a consistent pure white to off-white.\u00a0 Often grey, it may also be yellow or brown.<\/p>\n
Limestone is very soft density and can range in hardness depending on type.\u00a0 It can be a soft rock and is easily scratched. \u00a0It is porous and will effervesce readily in any common acid.\u00a0 Limestone does not take polish well and typically has a non-glossy surface with a matte finish.\u00a0 Limestone\u2019s can be smooth to rough and may vary greatly in texture and porosity from coquina<\/i> to oolitic.<\/i> \u00a0Microcrystalline limestones have an extremely fine grain.<\/p>\n
There are dozens of forms that limestone can take.\u00a0 They include Fossilferous<\/i>, Lithographic<\/i>, Coral rag, Chalk<\/i>, and Tufa<\/i>.<\/p>\n
The most common forms of limestone are:<\/p>\n
Calcarenite<\/i> composed of sand-sized carbonate grains of calcite.\u00a0 The Pietra di Bismantova<\/i> in central Italy is an example of calcarenite formation. Limestone is widely used in architectural applications for paving, walls, decorative trim and veneer applications. \u00a0\u00a0Many landmarks across the world, including the Great Pyramid and its associated complex in Giza, Egypt, are made of limestone. Kingston, Ontario, Canada has so many buildings constructed from limestone it that it is nicknamed the ‘Limestone City’.\u00a0 Limestone was a very popular building material for train stations, banks and other public structures during the late 19th<\/sup> and early 20th<\/sup> centuries.\u00a0 Many famous buildings in London are built from Portland limestone.\u00a0 In the USA the Bloomington area has been a source of high quality quarried limestone called Indiana limestone.<\/p>\n Marble.\u00a0 <\/b>Limestone deposits can undergo metamorphism during major geological events resulting in a recrystallizing as marble.\u00a0 In the Building Trade, the same stone can be marketed one time as a limestone and, at another time and place, sold as marble.<\/p>\n Bluestone<\/strong>.\u00a0 The common commercial name of \u201cbluestone<\/em>\u201d is applied to a variety of building stones. \u00a0The bluestone<\/i> that comes from the Shenandoah Valley in the USA, and from the Hainaut<\/i> quarries in Soignies<\/i>, Belgium and from quarries in County Carlow, County Galway<\/i> and County Kilkenny<\/i> in Ireland is actually limestone.<\/p>\n Photos:<\/strong><\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" Limestone rock is composed of medium particle sizes and is derived from calcite. Limestone can be clastic with particles of any size and it can also be chemical.\u00a0 It is a sedimentary rock composed principally of calcium carbonate (calcite) or the double carbonate of calcium and magnesium (dolomite). \u00a0It is commonly composed of tiny fossils, … <\/p>\n
\nOolitic<\/i> Limestone is calcarenite that contains a quantity of oolites.\u00a0 Oolites are spherical grains shaped like an egg.\u00a0 The islands of the Lower Keys<\/i> in Florida are mainly oolitic limestone.
\nCoquina<\/i> is a matrix of whole or pieces of seashells loosely cemented by calcite.\u00a0 Coquina comes from Spanish for cockleshells or shellfish.\u00a0 Coquina forms the walls of the Castillo de San Marcos<\/i> in St. Augustine, FL.
\nDolomite rock <\/i>or dolostone <\/i>is composed primarily of the mineral dolomite<\/i>, CaMg(CO2<\/sub>)3<\/sub>.\u00a0 Dolomite is essentially a limestone that contains from 5% to 40% magnesium carbonate.\u00a0 \u201cThe Dolomites\u201d mountain range, part of the Italian Alps, has the largest exposures of dolomite rock on earth.
\nMicrocrystalline<\/i> limestone contains calcium carbonate (calcite) structures that are so fine that they can be seen only under magnification.\u00a0 Microcrystalline calcite (CaCO3<\/sub>) has a crystalline texture.
\nTravertine<\/i> is limestone deposited by surface waters such as mineral springs, especially hot springs.\u00a0 It is noted for its holes and is extremely porous or cellular.\u00a0 The Colonnade of St. Peter\u2019s Square<\/i> in Rome is built with Italian Travertine<\/p>\n