102 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 
the sun, the upper part of the bottle will speedily be bedewed with drops of 
water ; these will be reabsorbed, and the inside of the bottle be rendered per- 
fectly dry by placing it in a cold situation. If some of the mineral be weighed, 
and then be carried for half an hour in the waistcoat pocket, it will be found to 
have lost from 6 to 7 per cent. of its weight thereby. 
CELADONITE. 
1. Occurs filling druses and coating chalcedony in close association with 
chlorophzeite, in the basalt south of the Giant’s Causeway. 
Structure earthy, opaque; colour, brilliant dark apple-green; very soft, 
polishes with the nail. Specific gravity, 2 ° 63. 
Contained a little calcite, and was somewhat cavernous in spots, the cavities 
being slightly brown. The calcite and brown portions were cut away. 
On 1° 303 grammes— 
Silica, : : ie 
From Alumina, . *005 
Wao = 56° 408 
Alumina, . : : Sealers 
Ferric Oxide, . : br DAs 10% 
Ferrous Oxide, ‘ bet 1095 
Manganous Oxide, . 5 23 
Lime, , ; ; F ‘601 
Magnesia, : : 5 0909 
Potash, . : ; 14. jomoee 
Water, . : : . 6" 796 
100 : 292 
Loses 1° 364 of the above water at 212°. Was almost totally insoluble in 
acids. 
2. Occurs in bands of an inch or so in thickness in the amygdaloid of Scuir 
Mohr in Rum. These bands seem to be large flat cavities. They have some- 
times an obscure laminated structure, but the substance is impalpable, some- 
what greasy and not granular. The thin layers which coat the surfaces of the 
agates seem to be the same substance ; and it can be distinctly seen in the 
specimens around to be the colouring matter of heliotrope. Its colour is apple- 
green, and its specific gravity, 2° 574. 
