Rocks Classified and Described: A Treatise on LithologyLongmans, Green, and Company, 1866 - 425 páginas |
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Página 6
... coloured red by the peroxide of iron ; found in the bog iron - ore of Briesgau , in Germany , and elsewhere , or coloured yellowish - brown by the hydrated oxide of iron . ( Occurs in form of pebbles , e.g. in the sand of the Nile and ...
... coloured red by the peroxide of iron ; found in the bog iron - ore of Briesgau , in Germany , and elsewhere , or coloured yellowish - brown by the hydrated oxide of iron . ( Occurs in form of pebbles , e.g. in the sand of the Nile and ...
Página 7
... colours and degrees of trans- parency . Cp . amorphous Si combined with water , in varying proportion ( up to 13 per cent . ) , and small quantities of colour- ing matter . It is distinguishable from quartz by being almost entirely ...
... colours and degrees of trans- parency . Cp . amorphous Si combined with water , in varying proportion ( up to 13 per cent . ) , and small quantities of colour- ing matter . It is distinguishable from quartz by being almost entirely ...
Página 8
... Colour- less or coloured blue ( sapphire ) , red ( ruby ) , or cloudy ( corundum ) . Lustre vitreous , and frequently , on the basal cleavage surface , mother - of - pearl lustre . Transparent to translucent . Cp . = Äl , with small ...
... Colour- less or coloured blue ( sapphire ) , red ( ruby ) , or cloudy ( corundum ) . Lustre vitreous , and frequently , on the basal cleavage surface , mother - of - pearl lustre . Transparent to translucent . Cp . = Äl , with small ...
Página 9
... colour the flame yellow . In microcosmic salt it is only soluble with difficulty , leaving behind a skeleton of silica . With cobalt solution the fused edges are coloured blue . Not susceptible to the action of acids . Varieties of Colour ...
... colour the flame yellow . In microcosmic salt it is only soluble with difficulty , leaving behind a skeleton of silica . With cobalt solution the fused edges are coloured blue . Not susceptible to the action of acids . Varieties of Colour ...
Página 11
... colours . Lustre vitreous , sometimes resinous ; translucent , but usually only at the edges . Cp . = RSi + AlSi = 53Si + 30A1 + 12Ċa + 5Ña . Bp . fuses somewhat more readily than oligoclase to a colour- less glass . Unlike other ...
... colours . Lustre vitreous , sometimes resinous ; translucent , but usually only at the edges . Cp . = RSi + AlSi = 53Si + 30A1 + 12Ċa + 5Ña . Bp . fuses somewhat more readily than oligoclase to a colour- less glass . Unlike other ...
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Términos y frases comunes
aggregates Alps amygdaloidal aphanite appear argillaceous augite basalt beds bitumen brown Browncoal calcareous calcspar carbonate character chemical chlorite clay clay-slate Cleavage coal colour Colourless columnar compact composition compound conchoidal to uneven consists contains Crown 8vo crystalline schists crystals decomposed deposits diabase diorite dolerite dolomite earth Edition felsitic felspar fibrous fine-grained foliated formation fossils Fracture conchoidal frequently fuses garnet geodes geol geological Germ gneiss grains granite granular grav greenstones grey gypsum hornblende igneous rocks imbedded iron Jahrb labradorite lavas leucite lime limestone Lustre vitreous magnesia magnetic iron-ore marl mass massive matrass matrix melaphyre metamorphic mica mica-schist mineral muriatic acid occurs oligoclase opaque origin orthoclase oxide plutonic porphyritic pyrites pyroxene quartz quartz-porphyry resinous rock-salt sandstone Saxony schists sedimentary rocks serpentine shale silica slaty soluble sometimes strata sulphuric surface syenite texture trachyte transition translucent transmutation Transparent tufa usually varieties veins vesicular cavities volcanic Woodcuts
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