The Encyclopaedia Britannica: Or, Dictionary of Arts, Sciences and General Literature, Volume 15

acid alumina angles antimony appear arsenic augite B.B. fuses B.B. infusible basal beds Bivalves brittle brown calcareous called carbonate of lime carbonic acid Carboniferous character Chem chiefly clay Cleavage coal colour Colourless compact conchoidal containing copper Cornwall crystalline crystals deposited district earthy easily edges feet feldspar flame fossils fracture conchoidal fusible Geology gold grains granite granular gray green hornblende igneous rocks intumesces iron protoxide layers lead less limestone lode logy Macles magnesia mantle mass metallic mica miles Milton mineral mines Mirabeau Molière Mollusks Monoclinohedric nearly nitric acid occur Old Red Sandstone Oolitic opaque oxide perfect period planes principal prismatic produced quartz resinous Rhombic Rhombohedric sand sandstone Scotland sectile shale shell silica Silurian silver slate soda soluble in h sometimes species stone streak sulphur surface Tesseral thick thin tion trachyte Translucent transparent upper valve varieties veins vitreous yellow