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acid alumina analysis Angles anhydride Anhydrous antimony arsenic bead Bismuth Blende blue borax Botallack brittle brown Calcite carbonate Cassiterite cent Chalcopyrite Chalybite charcoal cleavage coating colour common Comp compact conchoidal Consols containing Copper Cornish Cornwall crystals dark decomposed depositing described Devon distinguished earthy easily East fibrous flame Fluor foreign formula fracture fuses fusible Galena gives granite green grey Group Gunnislake heated Hematite Hexagonal HNO3 Huel infusible iron Italy known lead light lime Limonite Local localities lustre macled magnesia magnetic manganese masses massive matrass metallic micro minerals mines named nearly North occurs odour opaque oxide pale perfect prisms Pyrites Quartz rare reactions readily remarkable Rhombic rock silica Silver soda soluble solution sometimes South Spar specimens streak strong substance sulphur thin translucent transparent turns uneven United usually variety vitreous West yellow yields
Page 54 - ... 1. Talc. 6. Orthoclase. 2. GypSum. 7. Quartz. 3. Calcite. 8. Topaz. 4. Fluorite. 9. Corundum. 5. Apatite. 10. Diamond.
Page 77 - The organic constituent of this substance (pigotite), the author considers to be derived from the decay of the various plants which grow on the moist moorlands above, and which, being carried by the waters into the fissures of the granite beneath, combines with the alumina of the decomposed felspar ; and when it reaches the air, deposits itself on the roof and sides of the caverns, in the form of layers, varying from a line to two or three inches in thickness.