Abstract
Determination of the growth rate of crystals may be based on knowledge of the linear rate, the volume rate, and duration of crystallization. Direct measurements are possible where crystals are in process of growth as in the laboratory, saline waters, and at volcanic gaseous exhalations. Indirect but absolute measurements are possible by relating crystal zones with known occurrences in time examples include calcite growth in belemnites, cave stalactites with smoke layers, and seasonally varied saline waters. Relative growth rates may be inferred from the nature of the intergrowth surface between different mineral crystals. Data is given on growth rates of gypsum, halite, calcite, fluorspar, quartz, hematite, pyrite, nepheline, bronzite, olivine, plagioclase, pyroxene, argentite, and corundum. — M. Russell
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