Aragonite in California Glaucophane Schists, and the Kinetics of the Aragonite--Calcite Transformation

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Abstract
Coleman & Lee's discovery that aragonite is a widespread metamorphic mineral in California glaucophane schists is confirmed and amplified. Methods of microscopic distinction between aragonite, calcite, and dolomite, including a universal-stage technique, are described. Further data are recorded regarding the paragenesis of aragonite-bearing glaucophane and lawsonite schists. Carbonates in the greenschist facies are found to be exclusively calcite and dolomite. In many Californian metamorphic aragonites partial inversion to calcite has been observed. This appears to be an equal-volume replacement in which an a axis and an edge [f: f] of calcite—both directions of Closest spacing of Ca++ions—commonly are parallel to of the crystal axes a, b, and c of aragonite.

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