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Eccentricity of hexagonal dislocation etch pits

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Dislocation etch pits with hexagonal outlines are revealed on calcite cleavages etched with glacial acetic acid. Pits are symmetric with respect to (110) direction, but depth points do not coincide with geometrical centres of planar etch pits and thus are eccentric. For hexagonal etch pits shifts and eccentricities lie along (110) direction, unlike rhombic etch pits where eccentricity lies along (110) direction. Eccentricity in hexagonal etch pits is explained on basis of lateral reaction rates which depend on etchant concn.

Eccentricity of regular pentagonal etch pits

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Geometrical centres and depth points of nearly regular pentagonal etch pits produced by HCl on calcite cleavages do not coincide. Therefore etch pits are eccentric. Pits are usually symmetrical about line along (110) direction that passes through vertex opposite to baseline. However, some pits are asymmetrical about this line. Symmetrical etch pits are produced on dislocations in (110) plane. Eccentricity of symmetrical etch pits is along (110)direction and depends on etchant concn. and inclination of dislocation line. Eccentricity of asymmetrical etch pits is along(110) direction and this can be explained in terms of inclined dislocations in plane other than (110) plane.

Eccentricity of rhombohedral dislocation etch pits

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Rhombohedral dislocation etch pits were observed on calcite cleavages etched by glacial acetic acid under static and dynamic conditions. Lack of coincidence between depth points and geometrical centres of the planar etch pits results in eccentric etch pits. Eccentricities of dislocation etch pits are not same on matched faces etched with same concn. of glacial acetic acid under static or dynamic conditions.

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