|
Botryogen is a hydrous magnesium sulfate mineral with formula: MgFe3+(SO4)2(OH)·7H2O. It is also known as ''quetenite''. It crystallizes in the monoclinic prismatic system and typically occurs as vitreous bright yellow to red botryoidal to reniform masses and radiating crystal prisms. Its specific gravity is 2 to 2.1 and its Mohs hardness is 2. It occurs in arid climates as a secondary alteration product of pyrite-bearing deposits. It was first described in 1828 for an occurrence in the Falu mine of Falun, Dalarna, Sweden. It was named for its grape like appearance from Greek ''botrys'' for bunch of grapes and ''genos'' to bear. ==References== * Palache, C., H. Berman, and C. Frondel (1951) ''Dana’s system of mineralogy'', (7th edition), v. II, pp. 617–618. *(Mineral Data Publishing (PDF) ) *(Mindat with locality data ) *(Webmineral data ) 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「botryogen」の詳細全文を読む スポンサード リンク
|