The Montserrat mountain actually has conglomerate as its main type of rock. If I remember correctly from my geology classes, conglomerate is a mix of many different stones of different sizes that have been lithified due to pressure. I don't think it was easy to carve out stuff from that type of rock, so making the cloister up there must have been very difficult.
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Thanks for sharing your knowledge, valth. You're right and it has layers too.
It was probably not only hard but also took a very long time. Like hundreds of thousands of years.