458 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 
From the Vicinity of Serpentine. 
5. On the north-east side of the serpentinous hills of the Coyle, Aberdeen- 
shire, a pathway leads through fields past the house of Alltcailleach. On the 
south side of this pathway, about half-a-mile west of the house, two large, 
apparently loose blocks of malacolite, with a somewhat radiating crystalline 
structure, and a pigeon-blue colour, protrude from the soil. The only asso- 
ciated mineral is Biotite in crystals. 
Lime is said to occur near the stream which flows northward from the 
horse-shoe group of hills, 
The specific gravity of this malacolite is 3°183. On 1-°3 gramme — 

Silica, : : °663 
From Alumina, . - 002 
* 665 = 5b 
Ferric Oxide, . ; . LoseZ 
Ferrous Oxide, : eae 
Manganous Oxide, . ; - 384 
Lime, : : “ . 26.°363 
Magnesia. : ; . &e- O76 
Potash, . : : f *63 
Soda, 2 ; Z 5 i 2 lay 
Water, . , : F = Heyl 

99 - 893 
Possible impurity, Biotite. 
Besides the above, malacolite occurs in most of the granular marbles and 
highly altered limestones of Scotland,—as at Rodil in Harris, Ballipheetrich in 
Tiree, Glen Mark, Morenish on Loch Tay, Strath Dee, &c. “Ss 
The finest crystals of malacolite which I have seen in Scotland were found — 
by Dr Lauder Lindsay, ‘somewhere in Glen Callater ;’ they were associated 
with actynolite. | 

Sahlite. 
(Ca Mg Fe) Si. 
From Granular Limestone. 
Of the two varieties of sahlite which are associated with malacolite in the 
limestone of Shinness, all that need be noted, in supplement of the observations 
already made, is that the lighter—-the sap green variety—does not occur in erys- 
tals much over half the dimensions of the white variety ; while the dark green 
—almost augitic variety—is in crystals of only about an inch in size. However 
closely associated are the three varieties, they never pass into one another. 

