PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 111 
1°3 grammes of the green mineral yielded, when fused with Fresenius’ 
flux— 
Silica, ; : * 596 
From Alumina, “005 
°601 = 46 * 23 
Alumina, : ; : ih) bey) 
Ferric Oxide, : : 1° 882 
Ferrous Oxide, . : or ite 
Manganous Oxide, : 384 
Lime, . : : . (ee: 
Magnesia, ./-. . 14°153 
Water, : 4 ¢ 13)"308 
100: 142 
Loses in bath 7° 657 of the above water. 
This looks very like a new mineral, but upon treating some of it with 
chlorhydric acid the greater part dissolved, leaving a small quantity of white 
silvery scales. 
As saponite is soluble in chlorhydric acid, while talc is not, and as an 
admixture of a little tale with saponite would give a composition similar to the 
above, there can be little doubt that this is some such mixture. 
The two substances which appear to be new are the following. I name 
them from their localities :— 
BHRECKITE 
Occurred in very small quantity in a large granitic boulder, which lay upon the 
west slope of Ben Bhreck, Tongue, Sutherland, and which I have already 
referred to as containing amazonstone and many other minerals. 
Is a bright apple-green, minutely granular or scaly powder, nearly as bril- 
liant in colour as celadonite. Is soft and friable. 
Was disposed upon the surface of quartz crystals, and therefore was one of 
the last substances to solidify; its immediate associates were specular iron and 
strontianite. 
The small quantity analysed was to all appearance pure. 
YOL. XXIX. PART I. 2F 
