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Ettringite.... a hydrous calcium aluminium sulfate mineral with formula: Ca6Al2(SO4)3(OH)12·26H2O.........N'Chwanning II Mine, Kuruman, South Africa thumbnail - 2.1 x 1.8 x 1.5 cm.......http://www.marinmineral.com/af13.html

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from Pioneer Settler

Tanning Hides of Animals

DIY Video Tutorial On How To Tan A Hide | Homesteading Skills and Ideas by Pioneer Settler at http://pioneersettler.com/tanning-hides/

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Cyanotrichite -is a copper aluminium sulfate mineral with formula Cu4Al2[(OH)12|SO4]·2H2O, also known as lettsomite. © 2007 Michael C. Roarke - This image is copyrighted. Unauthorized reproduction prohibited. Locality: Grand View Mine (Last Chance Mine; No. 1 Pat claim 3591; No. 5 Pat claim 3592a; No. 4 Pat claim 3592a; Canyon Copper Mine; Grand Canyon Mine), Cape Royal, Horseshoe Mesa, Grand Canyon National Park, Grandview District, Coconino Co., Arizona, USA 20 x 17 mm

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Cyanotrichite - is a copper aluminium sulfate mineral with formula Cu4Al2[(OH)12|SO4]·2H2O, also known as lettsomite Photo Copyright © Chinellato Matteo - This image is copyrighted. Unauthorized reproduction prohibited. Locality: Salsigne mine, Salsigne, Mas-Cabardès, Carcassonne, Aude, Languedoc-Roussillon, France 0.74 mm area with several blue Carbonatecyanotrichite balls. Collection Domenico Preite photo Matteo Chinellato

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