Microbial Origin of Desert Varnish

Details Microbial Origin of Desert Varnish Microbial Origin of Desert Varnish

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981sci...213.1245d&link_type=abstract

Science, Volume 213, Issue 4513, pp. 1245-1247

Physics

31

Scientific paper

Scanning electron microscopy and energy dispersive x-ray analyses of desert varnish reveal that microorganisms concentrate ambient manganese that becomes greatly enhanced in brown to black varnish. Specific characteristics of desert varnish and of varnish bacteria support a microbial origin for manganese-rich films. Varnish microbes can be cultured and produce laboratory manganese films. Accordingly, natural desert varnish and also manganese-rich rock varnishes in nondesert environments appear to be a product of microbial activity.

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