Aggregates of gypsum crystals in stromatolitic sample from northern Chile. (IMAGE)

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Aggregates of gypsum crystals in stromatolitic sample from northern Chile.

Caption

Pink arrows point to spherical, radiating aggregates of gypsum crystals observed in the lower part of stromatolitic sample from Salar de Pajonales in northern Chile. These structures illustrate gypsum mineralization associated with microbial biosignatures. 

Credit

Tebes-Cayo et al., 2026.

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