110 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND, 
1°499 grammes gave— 
Silica, : : T7200 
From Alumina, - 026 
eH bal = 54°'702 
Alumina, ’ ‘ ; wie) 
Ferric Oxide, : : 2-599 
Ferrous Oxide, . E 9°82 
Manganous Oxide, ‘ *24° 
Lime, . . : ; ae fil 
Magnesia, . : : 16° 34 
Water, . 3 ; ‘ 10° 82 
100 : 467 
Loses 6° 101 of the water in the bath; insoluble silica, 7 - 66 per cent. 
The above is the analysis of the substance, purified as far as possible from 
its two associates, and it accords fairly well with celadonite ; but I incline to 
regards its apparent similarity therewith as being fortuitous, and probably the 
result of imperfect separation from quartz, and I conceive that the mineral may 
actually be saponite, impure from chalcedonic admixture. 
I take this view from its colour and lustre, from its being partly soluble in 
acids, and from finding that some portions gave a loss in bath of 12-447 per 
cent. of water, with about 9 per cent. of residual water ; so if the substance 
analysed be not impure saponite, saponite itself must here occur. 
2. In crystalline granular limestones which do not manifest well-marked 
features of alteration there are no minerals to be found, if we except such a 
common one as pyrite ; but there are frequently also to be seen plates or inter- 
rupted layers of an ill-defined green mineral generally in too intimate a state of 
intermixture with the lime, or with included portions of the matrix, to permit 
of separation for analysis. 
I was so fortunate as lately, in company with Dr AITKEN of Inverness, to 
obtain some of this substance from the limestone quarry of Reelig, near the 
Beauly Firth; this was sufficiently pure, and no more than so, for analysis. 
_ Its colour is a somewhat dark green, its structure is granular, or foliated 
crystalline. It is softer than the nail. Its appearance is intermediate between 
chlorite and saponite. In pounding it became brown. It was associated with 
a slaty steatite, which contained layers of minute crystals of talc. Belts of 
banded and mottled steatite, like Naples’ soap in appearance, also occur in 
the lime, carrying rarely crystals of calcite. 
