What is granite composed of by volume?
True granite contains between 20% and 60% quartz by volume. It also requires that 35% to 90% of the total feldspar consists of alkali feldspar.
Questions about Granite
Short answers, pulled from the story.
How does granite form underground?
Granite forms from silica-rich magmas that slowly cool and solidify underground. Felsic magmas form by adding heat or water vapor to rock in the lower crust.
When was the Great Pyramid of Giza built with Red Aswan Granite?
The Great Pyramid of Giza around 2580 BC contains a sarcophagus fashioned of Red Aswan Granite. The mostly ruined Black Pyramid once had a polished granite pyramidion now displayed in Cairo.
Where did Alexander MacDonald invent steam-powered cutting tools for granite?
Alexander MacDonald invented steam-powered cutting and dressing tools inspired by ancient Egyptian carvings. In 1832 the first polished tombstone of Aberdeen granite appeared at Kensal Green Cemetery.
Why do some granites become micro-fractured during fires?
Fires exceeding 1000 degrees Celsius cause differential thermal expansion that damages the rock. Such heat induces substantial volume changes generating internal stresses.