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Chert from
Beach gravel, Paraíso, Barahona Province, Dominican Republic

Comments:Tens of km of beaches composed almost entirely of smooth chert shingles, eroded out of the adjacent limestone cliffs - perhaps millions of tons of fairly pure chert. Colour and translucency are highly variable, with many different shades of white, grey, brown, pink, reddish and toffee-coloured tones. Some of the pinker more translucent ones would make good lapidary material. Some are faintly banded, with the banding only visible when wet. The transition between chert and limestone is very variable too - some very sharp boundaries perhaps only 0.1mm thick, and others where the gradation covers 5mm or more. Shape is typically flat smooth shingles, but more round concretionary forma exist too, and cylindrical, lenticular and irregular forms. Apparent flat plates are probably broken pieces from chert nodules which originally had a highly flattened lenticular shape.
Validity:Believed Valid
References:Alfredo Petrov field observations, January 2011.
Mineral Data:Click here to view Chert data
Locality Data:Click here to view Beach gravel, Paraíso, Barahona Province, Dominican Republic
Nearest other occurrences of Chert
10.9km (6.8 miles) Beach gravel, La Ciénaga, Barahona Province, Dominican Republic
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