20 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 
Masses of rock, raised on the farm of Achadhaphriz, contained, imbedded 
in a felspathic and hornblendic base, crystals of sphene, very rarely of rutile, 
more commonly of apatite, and plates of from two to three inches in length of 
lepidomelane. 
Colour yellowish brown to chocolate brown. Lasily cleavable, but only in 
small pieces, bemg brittle ; slightly biaxial; of a muddy yellow-brown by trans- 
mitted light. 
Reduced to powder with comparative ease. Specific gravity, average of 
three pieces, 2 : 971. 
On 1-3 grammes— 
Silica, , é all 
From Alumina, ; (OSs 
"525 = 40°384 
Alumina, . ; 5 > 2 
Ferric Oxide, . E . G4 <523 
Ferrous Oxide, 2 10a 
Manganous Oxide, . §8°146 
Lime, ‘ : : - 0338 
Magnesia, ; : oe aS 
Potash, : 3 ; : SO IS 
Soda, ; : Sere alee sO)! 
Water, d ‘ ; PhS 
99-722 
Insoluble silica, 2° 856 per cent. ; possible impurity unknown. 
The “glass” formed by the fusion of the mineral with Fresenius flux is of 
a very dark, almost black, colour. 
From Exfiliration Veins in Granite. 
2. Is one of the numerous minerals which accompany the Amazonstone 
in the vein in the “syenetic” granite, a boulder of which was found on Ben 
Bhreck, Tongue, as described in Chap. Hl. The lepidomelane was found in 
considerable quantity, in plates of an inch or two in size. 
The appearance was very similar to the last. The colour was of a deep 
rich brown ; it cleaves into somewhat larger folize than does the mineral from 
Achadhaphriz, these foliz are almost opaque, slightly biaxial, and crush with 
ease. Specific gravity, 2° 965. 
