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Mader Stein, or ''Maderstein'', is a (NHN) high hill in North Hesse, Schwalm-Eder-Kreis, north-east of the village of Maden, which belongs to the town of Gudensberg. == Geology == The hill is the remains of an extinct volcano that belongs to the West Hesse Depression.〔 〕 The volcano was active in the Miocene, i.e. it began 20 million years ago and ended 7 million years ago. The only part of the volcano that is left is the neck; the rest has been eroded. The alkali basalt has a silica (SiO2) volume percentage of 45-55%.〔 〕 The main minerals in the rock are plagioclase, augite and olivine. The hill cannot be called a kuppe because the top is covered with rock formations. Instead Mader Stein can considered a rocky hillock. The columns of basalt of the hill are sub-horizontal, as at Scharfenstein. 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「Mader Stein」の詳細全文を読む スポンサード リンク
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