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Brisbane tuff is a type of rock, formed as a result of a volcanic eruption. As the name suggests, it is a type of tuff found in Brisbane, Queensland, Australia. Brisbane tuff is a form of welded ignimbrite.〔(【引用サイトリンク】url=http://windsorhistorical.org.au/brisbane-tuff/ )〕 It is found in various parts of Brisbane and was quarried extensively in the early history of Brisbane at the Kangaroo Point Cliffs and the (now) Windsor Town Quarry Park for use in construction of Brisbane's earliest buildings. Brisbane tuff comes in a variety of colours: pink, green, blue (grey) and purple.〔(【引用サイトリンク】url=http://www.qhm.com.au/default.asp?contentID=172 )〕 The different colours are due to the extent of oxidation of iron and manganese.〔 It is often incorrectly described as porphyry. ==Construction== Brisbane tuff has been used in the construction of the following Brisbane buildings, many of them now heritage-listed: * Commissariat Store * Cathedral of St Stephen * Manor Apartment Hotel * St Martin's House File:Commissariat Store, Brisbane 10.jpg|Commissariat Store File:St Stephen's cathedral, Brisbane.jpg|St Stephen's cathedral File:Former St Martin's Hospital, Brisbane 052013.jpg|Former St Martin's Hospital 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Brisbane tuff」の詳細全文を読む スポンサード リンク
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