236 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND, 









delicate lavender reflection of considerable brilliancy and great beauty, The 
associated minerals are the grey orthoclase, the analysis of which has been 
given, and quartz, But few pieces of the moonstone could be got. 
Colour, greyish white, translucent in patches. Cleavage angle, 86° 21’; 
specific gravity, 2 * 627. 
1° 401 grammes yielded— 


Silica, ; : ser Oly 
From Alumina,’ . con Zit 
"9382 = ‘66-966 
Alumina, . : - 19°46 
Ferrous Oxide, . ; *601 
Magnesia, . ; . 214 
Lime, 2-038 
Potash, Le22s 
Soda, i , 9° b45 
Water, : ; : °314 
100 : 366 
Insoluble silica, 4°584 per cent. ; possible impurity, quartz. 
From eajiltration Veins in Syenitic Granite. 
2. From the exfiltration vein in the boulder of syenitic granite on the slope 
of Ben Bhreck, Tongue. 
The associated minerals have been already mentioned. The mineral occurs. 
in the rare form of radiated Cleavlandite. It has been proterogenetic to 
amazonstone, quartz, specular iron, and the radiated hydrated carbonate of lime. 
The other minerals were of anterior solidification. 
Occurring only towards the centre of the vein, it forms mamillated bands of 
about one inch in thickness, with a 
radiated sheafy structure; 
times it occurs in leaves. 
sheafs are loose, and divergent at ‘ 
their circumferences; and are there _ 
imbedded either in quartz or ama- 
zonstone, — more rarely in the — 
general mass of the vein. 
specimens were very pure, 
Radiated Cleavlandite in Amazonstone, colour is cream-white. The lustre 
pearly on the flat faces, vitreous on the edges. The S. G. 2-622. 





W iy, 
z 
