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
Feldspar
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Feldspar is a group of rock-forming aluminium tectosilicate minerals, also containing other cations such as sodium, calcium, potassium, or barium. The most common members of the feldspar group are the
Bluestone
…dolerites in Tasmania, Australia; and in Britain (including Stonehenge) feldspathic sandstone in the US and Canada limestone in the Shenandoah Valley in the US, from the Hainaut quarries in Soignies, Belgium, and from quarries in County…
Specimen of rare plumbian (lead-rich) feldspar
Crystallized white feldspar, with an upright 4 cm aquamarine crystal perched on it
Feldspar and moonstone, from Sonora, Mexico
A cluster of euhedral feldspar crystals with a schorl crystal