480 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 
25 grains yielded— 
Silica, E : p 7) OL" 936 
Alumina, ; : ee ee 
Ferrous Oxide, ‘ @ LS 9 
Manganous Oxide, . ; °25 
Lime, : : ; 5 Us! 
Magnesia, . ; : =, Id 38a 
Titanie Acid, ‘+. : : -38 
Water, ; , ; ; ‘2 
101° 252 
Possible impurity, magnetite. 
18. From near the shores of Loch Scavaig. Specimen from Mr Grieve. 
Large, dark-green, cleavable masses, associated with large (one and a half inch) 
crystals of grey striated labradorite, and, more rarely, imbedded magnetite. 
Specific gravity, 3° 321. 
1-573 grammes yielded— 

Silica, : ; : +49" 268 
Alumina, . rc ; : * 222 
Ferric Oxide, ee 
Ferrous Oxide, . , » 12505 
Manganous Oxide, . : “381 
Lime, ; : : Ae 20256 
Magnesia, : : « 14812 
Water, . ‘ : : gk) 
99 Oi 
6° 193 per cent. of the silica were insoluble. Possible impurity, magnetite. 
The above are all varieties of the pseudo-hypersthene form of augite, 
but furnished to me as typical specimens of true hypersthene ; and they were 
the finest and most typical specimens of the peculiar mineral of the locality 
which I have seen. They are not Paulite,—I have never seen, nor do I 
believe in the existence of that mineral here at all. The likest thing to itI | 
have seen from the Cuchullins, is a polished specimen in DupGEon’s Cabinet, 
found not far from Sligican Inn, and which I believe to be Biotite lymg ina 
peculiar position. The structure of Paulite under the microscope is perfectly 
characteristic and unmistakable ; the stone embraces a multitude of parallel 
flattened pores, of such dimensions as to reflect light of a mingled purple and 
dark-brown colour. 
T have, in the table, appended to my own, three other analyses of the Skye 
mineral ; that by Murr is imperfect as regards the separation of certain of the 
bases ; but it is palpable that all were made on specimens from the same hill 
range, and that all are augite. 

