An Introduction to Mineralogy Adapted to the Use of Schools And Private Student
An Introduction to Mineralogy Adapted to the Use of Schools And Private Student
J L John Lee Comstock
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Fusible into a black glass. Composition. Silex 40; alumine 20; lime 14. 5; oxide of iron 14. 5 ; oxide of manganese 2. Laugier. Distinctive characters. The direction of its striae differs from those of common garnet, and its specific gravity is less ; in other respects they a re much alike. Localities. Siberia, and probably in Saxony. Variety 6. MANGANESIAN GARNET. External characters. Colours, deep hyacinth, or brown- ish red; occurs in dodecahedral crystals and massive; frac- ture imperfectly... conchoidal ; lustre vitreous. Chemical characters. Fusible alone ; with borax and ni- tre, gives a violet globule. Composition. Silex 35; alumine 14 ; oxide of manganese 35 ; oxide of iron 14. Klaproth. It is singular that a substance differing so much in com- position from common garnet, should take its form and co- lour. Locality. Franconia. U. S. Nine miles from Philadelphia, Penn. , in masses from 1 pound to 100 pounds. Jessup. Corlaer's Hook, N. Y. Jones' Eddy, near Bath, Maine. Variety 1.
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