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PHOSPHOBESCENCE. 67 6. Flesh-red. A pale, rather yellowish-red. 7. Carmine-red. The pure red colour of carmine. 8. Cochineal-red. Red, with a little blue and grey. 9. Rose-red. Pale carmine-red. 10 - Crimson-red. Bright red, with a little blue. 11- Feach-blossom-red. Pale crimson-red in feebly trans- lucent substances. 12. Columbine-red. Dark, blackish crimson-red. 13. Cherry-red. Dark, rather brownish cochineal-red. 14. Brownish-red. Red, with a great deal of brown. The colour of reddle. l. Reddish-brown. Brown mixed with a great deal of red. 2 - Clove-brown. Dark clear brown, inclining to violet-blue. 3. IIair-brown. Brown, with a little yellow and grey. Broccoli-brown. A colour intermediate between liver- brown and violet-blue. E ' Chesnut-brown. The purest brown colour. 6- Yellowish-brown. Brown, with a great deal of yellow. 7. Wood-brown. Brown, with yellow and grey. 8 vcr-bro wn. Brown, inclining to green. 9. Blackish-brown. Brown, with a great deal of black. h idescence is occasionally observable on the surface of minerals, but it is not an essential character. Opalescence in different degrees is also occasionally ob servable, exhibiting differently coloured light. ., a lso occasionally happens, as in a green variety of fluor, that the colour exhibited by transmitted light differs from that occasioned by reflexion. In cordierite, epidoto, and many other minerals, the colour by transmitted light varies wdth the direc tion in which it is viewed. This property is denoted by the term pleochroism. PHOSPHOEESCETTCE. 251. Many varieties of fluor and diamond begin to shine in the dark at a temperature below that of boiling water. Fluor, a patite, dolomite, diamond, many varieties of calcite, and soum other minerals, phosphoresce at « temperature below that ot ted heat. Blende from Kapnik shines when scraped or scratched. Many varieties of dolomite and calcite frequently emit light when struck with a hammer. Two pieces of quartz phospho resce when rubbed against each other, either in air or under Water. Gypsum, fluor, calcite, aragonite, amber, and especially