PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 117 
pseudo-vein of reddle, of “concretions” of granular pale purple carbonate of 
lime, of a discoid form; and to these concretions being invested by the 
glauconite-like material, disposed in a laminated manner. 
Portions of the calcareous concretions,—of their green coating,—and of 
the reddle, were examined in the laboratory, after isolation each from the 
others, } 
The concretions did not appear to have any structural arrangement of 
particles, being similar to a very fine-grained saccharine marble ; they dissolved 
readily and totally in acid, without leaving any save a glauconitic residue ; and 
neither they nor their associates contained any trace of barytes. 
The glauconite-like matter was found to be insoluble in all acids; but after 
treatment therewith and agitation in much water, it separated into minute 
colourless pearly scales (like mica), and a green powder, which was also 
minutely scaly, 
The reddle had a laminated arrangement of its particles parallel to the sides 
of the vein ; it resembled a red sandy clay, and glistened with minute scales of 
mica. Treated with chlorhydric acid it yielded readily a ferruginous solution, 
_ but left behind the greater part of its bulk as a green powder, similar in 
| appearance, and also in its insolubility similar to that which presented itself 
originally with a green hue. 
| From the evident admixture of scales of mica, it may be doubted if an 
_ analysis of these green powders—probably identical—would definitely disclose 
| their nature; but the above chemical features sufficiently show that they cannot 
be any one of the saponites, unless it be celadonite, and their being the latter 
is contradicted by their scaly structure. 
Their insolubility in acids equally proves that they cannot be glauconite ; 
_ and, having regard to the occurrence in the conglomerate of quartz nodules 
_ with a chlorite which is very similar to that of Cruach Ardran and the hills 
| surrounding it, there is every probability that the green portion consists of 
chlorite alone. | 
| While the impurity of this substance prevents a more accurate determina- 
| tion, enough has probably been attained to, in the direction of indicating several 
| points of marked interest connected therewith. 
The following questions present themselves for being answered :— 
By what process were these veins filled? The ready reply,—-neither by 
| infiltration nor injection, but by exfiltration,—goes but a little way. Con- 
_ glomerated rocks are more pervaded by a system of inosculating holes than by 
fissures,—but I broke many pieces of the rock without being able to detect in 
| its cavities any green matter in the course of being transported to its resting 
| place in the vertical rents ; but an exfiltration of reddle-like matter may be 
| observed, and this may obscure a concomitant chloritic transfusion. 
