Dear Electrum, Perhaps what you are trying to learn is to what extent basalt was used as a building material in ancient Greece and the Roman Empire. In ancient Rome basalt was put to many uses including street pavers. It was used extensively throughout the Roman Empire in a variety of construction purposes such as stadium seating.
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JohnParisDear Electrum, Perhaps what you are trying to learn is to what extent basalt was used as a building material in ancient Greece and the Roman Empire.Very, very good reply, thank you. In the meantime, I also found an image of basalt columns in Umm Qais in Jordan.