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90% of Europes's natural slate used for roofing originates from the slate industry in Spain,〔(European Association of Mining Industries website ) retrieved on 26/01/2010〕 with the region of Galicia being the primary source of production. Slate is a fine-grained metamorphic rock that splits into thin, smooth-surfaced layers. Metamorphic rock is rock which has changed from one form of matter into another and is not as was originally laid down by nature. It is used extensively in the building industry, particularly for roofing tiles. The production of slate is estimated at 4 million tons per year.〔Fundación Centro Tecnológico de la Pizarra’s report into the ’Technical properties of Bambui Slate from the State of Minas Gerais (Brazil) to ascertain its compliance with the Standard EN12326’ (Brazilian Slate Report summarized by Consultant Geologist J A Walsh ), retrieved on 27/01/2010〕 ==Geography of Galicia== Galicia is situated on the North West coast of Spain, just above Portugal, and is subdivided into 4 provinces: La Coruña, Pontevedra, Lugo and Ourense. The main areas of slate production are:- *Valdeorras – the larger slate production companies are concentrated in this area of Orense〔AGP Galician Slate Association (Regional production ) retrieved on 26/01/10〕 *Quiroga – is the second largest production area, situated on the province of Lugo〔 *Ortigueira – in La Coruña〔 *Mondoñedo – including Mondoeñdo, Pastoriza and Lorenzana in Lugo〔 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「Slate Industry in Spain」の詳細全文を読む スポンサード リンク
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