A manual of mineralogy / By Arthur Aikin.

  • Aikin, Arthur, 1773-1854.
Date:
1815
Catalogue details

Licence: Public Domain Mark

Credit: A manual of mineralogy / By Arthur Aikin. Source: Wellcome Collection.

    239/280 (page 227)
    Sp. 97. CINNAMONSTONE. Kanellstein VV. Occurs massive, disseminated, and in detached splintery fragments, the massive being usually much cracked and showing a tendency to gra- nular concretions; colour orange brown ; more or less transparent; fracture flat and small-conchoidal, with an obscure appearance of lamellar structure ; lustre vitreo-resinous ; scratches quartz with difficulty.—Sp. gr. 3:6. —Fusible with ebullition into a dark greenish lass. 09°8 silex; 21:2 alumine; 31°25 lime; 6:5 oxide of iron. Klapr. Sp. 98. Pyrope. Pyrop W. Colour blood red, mixed with yellow ; ocenrs in imbedded granular concretions; fracture con- choidal ; lustre splendent, vitreous; transpa- rent.—Sp. gr. 3°8.—Fusible into a black enamel. 40 silex; 28-5 alumine; 10 magnesia; 3°5. lime; 16°75 oxide of iron and manganese. Klapr. In Claystone in Cumberland. Sp. 99. AvueiTe. Augit VY. Pyroxéne H. . Occurs crystallized, and in angular and round pieces; form, a compressed six- or eight- sided prism with dihedral summits ; structure lamellar, with joints parallel to the two sides and to the greater diagonal of an oblique rhom- boidal prism, the alternate lateral angles of which are about 88° and 92°; fracture un- even passing into conchoidal; lustre more or less shining, resinous; colour blackish green Q2