I've never visited St Nectaire, in the Auvergne, Fance, but it needs to be on my list. One of the fastest depositing petrifying places on Earth I think. They've also been using this wonderful natural process to make strange artworks since the C18th. 😊 🤓

The brilliant contemporary American-Scottish artist Ilana Halperin worked with them and made some amazing pieces...

https://www.studiointernational.com/index.php/ilana-halperin-interview-geological-phenomena-volcanoes-drawing-photography-gallstones

https://www.auvergnevolcansancy.com/en/site-culturel/fontaines-petrifiantes-de-saint-nectaire/

#Petrified #Calcite #Geology #HardWater #IlanaHalperin

Rock-forming minerals

Common minerals combine to make rocks

The Earth's crust is made of over 2,000 minerals. Of these, the most abundant are feldspar, quartz, #calcite, dolomite, mica, pyroxene, #amphibole, garnet and olivine. Because they combine to make rocks, these are called 'rock-forming minerals.

Feldspars are the most abundant minerals in the Earth's crust.

Rock-forming minerals

Common minerals combine to make rocks

The Earth's crust is made of over 2,000 minerals. Of these, the most abundant are feldspar, quartz, #calcite, dolomite, mica, pyroxene, #amphibole, garnet and olivine. Because they combine to make rocks, these are called 'rock-forming minerals.

Feldspars are the most abundant minerals in the Earth's crust.