—- 
———————————— 
PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 527 
1°22 grammes yielded— 

Silica, . : See ahs 
From Alumina, . ‘017 
bDo = 45 + 508 
Alumina, : ee SG 6 + 388 
Ferrous Oxide, 2 Lasso 14° 285 
Lime, . : a ee 4° 437 
Magnesia, : : Te 22-14 
Alkalies, . : : ee traces 
Water, . : 5 Sais Gi G2 
99-479 
It is possible that the so-called actynolitic crystals are the same substance, 
| darkened in colour by exposure—they are dark green and brittle. 
In large amount.—Hydrated Amianthus (2) ; Mountain Cork ; Mountain Leather. 
From Granular Limestone. 
20. From the limestone which occurs in the small promontory immediately 
to the west of the mouth of the Burn of the Boyne, in Banffshire. 
The mineral here is of a buff or wash leather colour. It is found in thin 
flexible sheets, and also in rigid cork-like masses. Rarely it is colourless. No 
structure is, to the lens, visible in the rigid masses; the thinner sheets seem 
composed of felted fibres. A portion of the white mountain cork was 
analysed. 
‘77 grammes yielded— 
Silica, . ; : * 393 
From Alumina, . * 0038 
2306 = 51° 428 
Alumina, . y - 5 PE ROLES 
Ferric Oxide, . : #.. 206 
Ferrous Oxide, . : . 2:486 
Manganous Oxide, . . 1°298 
Lime, : 5 j ‘ * 581 
Magnesia, . " ‘ ety) Pais 
Water, . , ; ., 20-043 
99 708 
Loses in water bath 10°88 per cent. of water ; insoluble silica, 1 428 per 
cent. ‘ 
