PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 99 
These numbers show that Mr Hannay’s process must throw down his mag- 
nesia too early in the analysis, so that it is set down as alumina; and as the 
analysis by myself and Mr Dauzreu of both the Catkin and the Bowling mineral 
agree with the others of saponite; and as the mineral is absolutely identical 
therewith in appearance, in gravity, in hardness, in the peculiar manner in 
which the water is combined, and im all its physical and chemical properties, 
we are forced to conclude that “ bowlingite” can be nothing but saponite. 
Saponite also occurs in very interesting specimens, which, according to in- 
formation derived from Patrick Doran, from whom I purchased them, were 
obtained at Berry Glen, in Ayrshire. 
Here the mineral is evidently crystallised, but the forms are minute, lustre- 
less, and apparently somewhat rounded at the edges of the crystals. Small 
groups of minute crystals are disposed upon the summits of acicular crystals of 
“ galactite ” (natrolite). 
The substances and order of deposition of these substances in the cavities 
which I have seen are :— Cluthalite ” (albite), cream-coloured galactite, red 
natrolite, saponite. The colour of the saponite is pale sap-green. 
The same mineral (apparently) was found by Dr Lauper Linpsay in 
| Corsiehill Quarry, on Kinnoul Hill, near Perth, disposed on the summits of 
| radiating quartz crystals ; here it is grass-green in colour, and of a minutely 
foliated structure ; it also colours the quartz throughout, so as to form a 
prase. 
Of the above localities affording saponite the following are all which afford 
any information as to the order of its deposition in the druses or rock-rents in 
| which it is found :— 
Kinneff—Heulandite, stilbite, quartz, saponite. 
Tayport—Celadonite, saponite :—and Calcite, saponite. 
Berry Glen—Cluthalite, galactite, natrolite, saponite. 
Corsiehill Quarry—Quartz, saponite. 
In the decomposition of the igneous rocks of the Old Red Sandstone age, 
therefore, the mineral (augite ?) whose decomposition yielded the saponite 
| would appear to have been the last to be disintegrated, the felspars giving way 
| first, to yield zeolites. 
From Igneous Rocks of Secondary Age. 
| 11. From the Storr, in Skye.—It here forms the outer—the first deposited 
| —layer, sometimes half an inch in thickness, of some of the druses which occur 
| in the rock at the east foot of the “Old Man of Storr.” Occasionally it alone 
fills the druse. When other minerals are present they are superimposed upon it. 
It is seldom that any other than chabasite is here present, but as this is the 
VOL. XXIX. PART I. 2C 
