石有什麽功用

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BUILDING AND CONSTRUCTION Construction materials from rocks are essential in building
and for maintaining our modern way of life, whether for city buildings,
runways and motorways or the family home.
Every year NSW uses about 50 million tonnes of rock.

SANDSTONE FOR BUILDING Many cities are characterised by the kind of rock
used for building during the early days of construction.
Sydney is sometimes called a Sandstone City.

There are seven quarries in the Somersby/Kariong area,
producing "dimension" stone. This Hawkesbury Sandstone
is a fine white to cream colour, often with beautiful markings.
The area is the most important source of building stone in Australia.
'Yellow Block' is another name for Hawkesbury Sandstone.
From 1850 to 1930 it was quarried from Sydney's inner suburbs,
eg Pyrmont and The Rocks, and used for buildings such as
Sydney Town Hall, Sydney University, Central Railway Station,
many churches - and for the foundations of many homes.
At present St Marys Cathedral in Sydney is having twin spires
added using this sandstone from a West Gosford quarry.




圖片參考：http://www.adderley.net.au/geology/exhibition/06/pix/06_01_01.jpg

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CIVIL ENGINEERING Millions of tonnes of crushed rock are needed annually for road base,
paving, ready-mixed concrete and asphalt. There is a large quarry for
these materials at Kincumber, using sandstone of the Terrigal Formation.
Crushed rock may consist of coarse or fine aggregate and sand.
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建築，飾物
磨刀石，紙鎮，硯
有孔的火山石在牛仔布洗水時會用到。
像玻璃的火山石可以做銳利的手術刀。