reduction sphere

reduction sphere

[ri′dək·shən ‚sfir]
(geology)
A white, leached, spheroidal mass produced in a reddish or brownish sandstone by a localized reducing environment, commonly surrounding an organic nucleus or a pebble and ranging in size from a poorly defined speck to a large, perfect sphere more than 10 inches (25 centimeters) in diameter.
References in periodicals archive ?
As of this writing, the oil firm that revved up competition on the price reduction sphere had been Phoenix Petroleum Philippines Inc.
Gasoline prices down P1.30/liter, diesel P1.10/liter
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