478 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 
Altogether this Rum augite must be called gem-like. Its specific gravity is 
3481, being the heaviest augite I know. 
1-302 grammes yielded— 
Silica, : P : . 50* 537 
Alumina, : ; Ma oosS 
Ferric Oxide, . : DM eae 33 
Ferrous Oxide, ; 5 | dled? 
Manganous Oxide, . ; °23 
Lime, : 5 ; . 21°419 
Magnesia, ; : Ly OD 
Potash, . : : : 2a 
Soda, ; : d : “ia 
Water, : ; ‘ : - 706 
99 - 833 
Pseudo-Hypersthene. 
From Hyperite. 
15. The specimens I have now to describe have been almost uniformly and 
very persistently set down as true hypersthene (Paulite). Maccuttocu, THom- 
son, ForsBEs, TRAILL, Nicou, and GREG have all called it so; JAMESON termed it 
“glassy actynolite,” which is certainly not further from the truth. HauGuron 
and V. Rats analysed it, giving it different names, but without pointing out 
the previous error. The writer has always disputed its identity with the 
Paulite of Labrador. 
To be assured that the analyses were conducted on specimens maintained 
to be true Paulite, and conclusively to settle the point as to that mineral 
occurring in Skye, the writer obtained his specimens from individuals who pre- 
sented them as hypersthene ; and he analysed examples from different spots in 
the Cuchullin range. 
From Corry na Creech. Specimens from Principal Fores. In large, lustrous, 
greyish-green crystals, associated with greenish-white labradorite. 
Cleavages and angles :— 
Cleavage a. (772) perfect, flat, splendent. 
b. (47) common, interrupted, somewhat dull. 
M. (I) very rare, but nearly perfect, vitreous. 
Angles aon b=90*, 
M on a=133° 38’ to 134° 08’;—133° 58’ common, 
M on M=87° 56’, 
which are augitic angles. 

