Bluestone
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Bluestone is a cultural or commercial name for a number of natural dimension or building stone varieties, including:
Carn Menyn bluestones. These dolerite slabs, split by frost action, seem to be stacked ready for the taking, and many have been removed over the centuries for local use. Research favours the theory that humans also transported stones from Carn Menyn to build Stonehenge, about 250 km away.
Bluestone monument and Carn Menyn, Preseli Hills
HM Prison Pentridge was one of the many buildings constructed of local bluestone in Melbourne in the 19th century
Typical colouring caused by mineralisation in Adelaide bluestone
Basalt
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Basalt; US: buh-SALT is an aphanitic extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron exposed at or very near the surface of a rocky planet or moon
Bluestone
…Bluestone is a cultural or commercial name for a number of natural dimension or building stone varieties, including: basalt in Victoria, Australia, and in New Zealand dolerites in Tasmania, Australia; and in Britain (including Stonehenge…
Basalt 12
QAPF diagram with basalt/andesite field highlighted in yellow. Basalt is distinguished from andesite by SiO2 < 52%.
Vesicular basalt at Sunset Crater, Arizona. US quarter (24mm) for scale.
Columnar basalt flows in Yellowstone National Park, US