Abstract
Crystal morphology may be a key to understanding the mode of formation of the mineral calcite. Morphological features include crystal shape, crystal size, macrostructure and microstructure. To define these features, a combination of optical and electron microscopes were employed. An x-ray diffractometer and a x-ray spectrometer were used as supporting equipment.Samples were chosen on the basis of simplicity to exclude unforeseen variables such as clay or other accessory minerals which are often present in limestones. Such material was obtained from the calcite zone in the cap rock of the Minden Salt Dome, Webster Parish, Louisiana.The calcite consists of essentially two phases as determined by x-ray diffraction; the major phase CaCO3 and the minor phase, sulphur. There is an apparent relationship between the amount of sulphur present and calcite crystal size, shape, surface microstructure and often times color.
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Schedule a callMore From: Proceedings, annual meeting, Electron Microscopy Society of America
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