Abstract
Cherts, rocks composed essentially of microcrystalline quartz, display a wide variety of crystal forms. Fractured and polished surfaces of a bedded and a nodular chert were examined with the S.E.M. before and after being etched in various solutions (HF, KOH, NaOH). The bedded chert is a member of the Arkansas Novaculite containing pyrite, organic matter, and silicified organic spherical bodies (possibly spores) 100-500 microns in diameter. The chert nodule is from a Cretaceous carbonate, and displays a white patina which is interpreted as a weathering rind.Unetched surfaces generally do not display crystal morphologies as well as etched surfaces. However, crystal forms were observed on unetched surfaces where the fracture exposed cavities within the rock.
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Schedule a callMore From: Proceedings, annual meeting, Electron Microscopy Society of America
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