Sand & geology
Praia das Catedrais
lithic-rich (volcanic/collisional terrane)
At low tide, there is access to a sand deposit delimited by a rocky wall made from slate and schist forming 30 metre arches resembling cathedral flying buttresses, large caves, sand corridors between rocky blocks, and other geological features.
Extracted from Wikipedia.
Predicted regional composition
Q-F-L (quartz, feldspar, lithic) fractions sampled from the GloPrSM global sand model at this beach's location.
Q 31%
F 10%
L 59%
GloPrSM v1.0.0 (IJ_QFL). GloPrSM is calibrated on modern river sand; beach sand in the same watershed is a reasonable proxy but not identical.
Got a close-up photo of the sand here?
Take a picture with a coin for scale and send it over. We're building a global grain-photo library and this beach isn't in it yet.
Praia das Catedrais43.5543, -7.1563