calcite is the main mineral found in limestone.
calcite is the main mineral found in which of the following rocks?
limestone
the carbonate minerals are those in which the main anionic group is carbonate, [co]. carbonates tend to be brittle, many have rhombohedral cleavage, and all react with acid. due to the last characteristic, field geologists often carry dilute hydrochloric acid to distinguish carbonates from non-carbonates. the reaction of acid with carbonates, most commonly found as the polymorph calcite and aragonite (caco), relates to the dissolution and precipitation of the mineral, which is a key in the formation of limestone caves, features within them such as stalactite and stalagmites, and karst landforms. carbonates are most often formed as biogenic or chemical sediments in marine environments. the carbonate group is structurally a triangle, where a central c cation is surrounded by three o anions; different groups of minerals form from different arrangements of these triangles. the most common carbonate mineral is calcite, which is the primary constituent of sedimentary limestone and metamorphic marble. calcite, caco, can have a high magnesium impurity. under high-mg conditions, its polymorph aragonite will form instead; the marine geochemistry in this regard can be described as an aragonite or calcite sea, depending on which mineral preferentially forms. dolomite is a double carbonate, with the formula camg(co). secondary dolomitization of limestone is common, in which calcite or aragonite are converted to dolomite; this reaction increases pore space (the unit cell volume of dolomite is 88% that of calcite), which can create a reservoir for oil and gas. these two mineral species are members of eponymous mineral groups: the calcite group includes carbonates with the general formula xco, and the dolomite group constitutes minerals with the general formula xy(co).
mineral
strictly speaking, fluoride therapy repairs rather than prevents damage to the teeth, causing the mineral fluorapatite to be incorporated into damaged tooth enamel. fluorapatite is not a natural component of human teeth, although it is found in the teeth of sharks. the main mineral found in natural tooth enamel is hydroxyapatite rather than the fluorapatite created in the presence of fluoride. even without fluoride, teeth experience alternating increases and decreases in mineral content, depending upon how acidic or alkaline the mouth is, and depending upon the concentration of other substances in the mouth, such as phosphate and calcium.
fluoride therapy