The manufacture of alum and the sulphates and other salts of alumina and iron; their uses and applications as mordants in dyeing and calico printing, and their other applications in the arts, manufactures, sanitary engineering, agriculture, and horticulture (1901)
Geschwind, Lucien · London : Scott, Greenwood & son; New York : D. Van Nostrand co. [etc., etc.] · leaf 149
I 29 AND COMPOUNDS OF THESE METALS Hardness, 6 to 7 ; sp.gr., 3-1 to 3*5; crystalline form, the orthorhombic prism. The simplest crystals are those from Vesuvius and Puy, which exhibit none of the faces of the primitive form. II. Augite . — Under this title are grouped the aluminous or other… … portion of ferrous oxide exceeds 5 per cent., without, however, exceeding that of the magnesia. Augite, properly so called, is the pyroxine of lavas and basalts (Vesuvius, Auvergne). It is derived from an oblique rhomboid prism. The secondary forms of these crystals are prisms with six of the faces…
Alum · Sulphates · Dyes and dyeing · Chemistry, Technical
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