100 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 
earliest formed of all the zeolites, all must be posterior in formation to the 
saponite. 
This saponite is of a dark olive-green colour, passing into colourless. It is 
about the hardness of slate pencil—being here harder than at any other Scotch 
locality : it resembles a hard steatite. Its specific gravity is 2° 296. 
25 grains yielded— 
Silica, . : ; > “A Ary 
Alumina, . : : 5 9 On 
Ferric Oxide, . 3 . 292 0b4 
Manganous Oxide, . : ‘107 
Lime, F ‘ ; > RG 
Magnesia, : : « 2ArS 
Water, . E : SONOS 
100: 722 
It lost 13° 652 of the water at 212°. Some specimens crackled and fell to 
pieces in water. 
12. From the Quiraing, Skye.—The pathway which leads from the Uig 
Road to the Quiraing looks down upon a little grass-clad valley, at a distance 
about half a mile from that road. Large masses of fallen rock lie in this 
valley, out of which there are, or rather were, to be obtained the finest gyrolites 
and the largest crystals of apophyllite to be found in Skye or indeed in Britain. 
Along with these saponite occurs filling druses. The mineral, when these 
are freshly opened, is quite pulpy, but a day’s exposure hardens it. 
It is then milk-white and curdy-looking, being of almost a friable structure. 
Sometimes it is quite pure ; sometimes a small amount of microscopic crystals 
of stilbite (?) are impacted in the mass. It is dull in lustre, but polishes with 
the nail. 
It falls to pieces in water. 
1° 499 grammes yielded— 
pilica,) (4 ; : . 42°504 
Alumina, . A 2 7 056 
Ferric Oxide, . ; : ° 852 
Manganous Oxide, . : * 224 
Tame, ‘ , . 38° 274 
Magnesia, : : . 23° 954 
Potash, . 2 3 : Pilvall 
Soda, ; ‘ , s "45 
Water, . : : 7 2 org 
100° 136 
‘Loses 15 + 536 of the water at 212°. Insoluble silica, 24: 98 per cent. 
