The local rock hounds group always need help identifying their finds…which are 9x out 10 some agate/chert/chalcedony thing.

I got some muriatic acid from the bricklayers that rebuilt my chimney last fall, and diluted it this morning and put in eye dropper bottles to give out to a lucky dozen of them.

No more mistaking carbonates from siliceous rocks on my watch.

#Geology #Rocks #Minerals #GeologyHumor #UrbanGeology

The students really loved it again, going on #UrbanFieldwork #UrbanGeology

Some very nice 'outcrops' #UrbanGeology #UrbanFieldwork #ZuidAs #amsterdam @VrijeUniversiteit #aardwetenschappen

#UrbanGeology #UrbanFieldwork no hammers allowed!

#urbangeology#geology

Granite millstones uncovered during waterfront park creation.

Interesting changes in magma crystallization. Reaction rims or just chemistry change?

I think the latter. Late stage crystal growth similar to groundmass.

When you find Jura Marbles at the entrance of the building, it often has luxury hotel on the upper floors. #UrbanGeology #FossilFriday

Posts on the geology of building stones from Pavement Geology and London Pavement Geology. For more info see our website https://www.londonpavementgeology.co.uk #urbangeology

@allochthonous
Lets not forget #pavementgeology
#urbangeology