Youtor
Limestone
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Limestone: - • ============ • • Definition: - • ..--..--..--..--..--.. • Most common sedimentary rock of non-clastic group. • Composed of chiefly of carbonate of calcium. • • • Texture: - • ..--..--..--..--.. • Fossiliferous in nature. • Some shows dense and compact texture. • Some shows loosely packet highly porous . • • • Composition: - • ..--..--..--..--..--..--.. • Limestone are chiefly made up of CaO Co2 (CaCo3). • Magnesium oxide is common impurity in most of the limestone. • If magnesium oxide exceeds 2% then the rock is called magnesium limestone. • • • Classification: - • ..--..--..--..--..--..--.. • 1. Chalk: - • ------------ • Present form of limestone. • Fine grained earthy texture. • Common colour of chalk is white. • 2. Shelly limestone: - • -------------------------- • Also called fossiliferous limestone. • Assemblage of fossil that has fully or partly preserved. • When limestone preserved and made up of entirely of fossil it is called coquina. • 3. Argillaceous limestone: - • --------------------------------- • Contain clay and carbonate in equal proportion. • Allochthonous origin. • 4. Lithographic limestone: - • --------------------------------- • Compact, hard, massive. • Homogenous • Lithographic texture (1/250mm) • Lithography (extensive used in lithoprinting) • 5. Kankar: - • ----------- • Non-marine in origin. • Formed by evaporation of sub-soil water rich in calcium carbonate. • 6. Calcic sinter: - • -------------------- • Formed by precipitation of carbonate rich spring water. • Deposits are also known as travertine or calcic tuffa. • Formation: - • ------------------- • Limestone have two different environments of formation. • 1. Bio-thermal limestone: - • ---------------------------------- • Sheets like accumulation of biogenic deposit. • Precipitated from local solution other lime secreting area. • 2. Pelagic limestone: - • --------------------------- • Formed by accumulation of tiny secretion of floating type sea organisms such as foraminifera. • 3. Uses: - • --------- • Uses as flux in methallogical industry. • Porlain cement • White cement • • 👉join us • telegram • https://t.me/Quartz_Academy • • instagram • https://www.instagram.com/geologyaspi... • • #limestone_and_its_uses • #limestone_and_its_description • #types_of_limestone #chalk • #sedimentary_geaology • #petrology • #geology_aspirant • #Owais_videos • • Do like and share, if you are new to the channel then please subscribe to our channel and also press the bell icon to get new geology related updates. • Thank you (team geology aspirant)
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