Açu valley, Potiguar Basin, Rio Grande do Norte, Northeast Region, Brazil

(Vale do Açu)

Ref.: J. Anderson et al. , The Journal of Geology, Vol 112 (2004), p. 317.

Cretaceous fluvial sandstones (Açu formation) along the basin margin.
Authigenic mineral formation due to evaporative concentration along the groundwater circulation pathways through the basin.

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Mineral List:

	Calcite

	Kaolinite

	Orthoclase var: Adularia

	'Smectite Group'

4 entries listed. 2 valid minerals.

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