<r R A 



Tungstein C- .;.;.,;;-'''; 0066 



Arsenic, cast ...... 5753 



Molybdena ...... 4733 



Spar, ponderous ..... 4430 



Ruby, oriental ..... 4283 



Garnet, Bohemian ..... 4188 



Sapphire of Puy . ... . . 4076 



Topas, oriental ..... 4010 



Beryl, or oriental aquamarine . . . 3548 



Diamond, rose coloured .... 3531 



white ..... 3521 



lightest ..... 3501 



Glass, flint ...... 3329 



white ...... 2892 



bottle ...... 2732 



green 2642 



Fluor 3191 



Serpentine, green ..... 2988 



Mica, black 2000 



Basaltes, from the Giants' Causeway . . 2864 



Marble, white, Parian .... 2837 



gram . . . . . t 2741 



red 2725 



white, of Carrara . . . . 2716 



Emerald, Peruvian ..... 2775 



Porphyry, red ..... 2765 



Jasper 2764 



Alabaster, white, antique .... 2730 



Calcarious spar, rhombic . ... 2715 



pyramidal .... 2714 



Slate . 2671 



Pitch stone ...... 2669 



Onyx, pebble ...... 2664 



Chalcedony, transparent .... 2664 



Granite, Egyptian, red .... 2654 



Rock crystal, pure ..... 2653 



Amorphous quartz ..... 2647 



Agate, onyx ...... 2637 



Carnelian . . . . , . 2613 



Sardonyx . . . . . . 2602 



Purbeck stone . . . . . . 2601 



Flint, white . . . . . 2594 



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