32 PROFESSOR HEDDLE ON THE MIN ERALOGY OF SCOTLAND. 
1-3 grammes yielded— 
Silica, : : : ‘445 
From Alumina, . : °019 
"464 = 35°692 
Alumina, . s : » 20°086 
Ferric Oxide, . ; =) pe woe 
Ferrous Oxide, . : de ONT 
Manganous Oxide, . ieee be 
Lime, : , : » ULES95 
Magnesia, . ; me tel. lA eeiG9 
Potash, . : ; ee Ook 
Soda, 4 . F ; °529 
Water, 3 K we 405 
100: 058 
Insoluble silica, 3-448 per cent. Possible impurity, quartz; no fluorine, 
These micas were not all examined for fluorine, but it was not found in any 
of those which were examined. 
HAUGHTONITE. 
S.G | Si | Al. | Fe | Fe. | im | Ga, | Me Hp || Nae. ee, Total. 
Roneval, * 6 ; 3°03 || 87°16 | 15° 7°69 | 17°35] 1:04 1°3 8°88 | 8°18 | 1:6 2°12 100°17 
Capval, : ‘ F 3°07 || 86°81 | 15:22 | 7-61 17°35 “96 | 1°54 8°78 | 8°31 | 1°34 2°47 100°40 
Loch-na-Muiine, ‘ : a 86°46 | 17°25 | 4:18 | 15-33 *b4 *69 | 12:23) 9:2 66 | 3°39 99°92 
Foinaven, ‘ : d 3°03 || 36°75 | 17°86 2°78 |15°18 “42 93 | 11°17 | 9:44 | 1-25 4°23 99°99 
Rispond, ; ; 2°99 || 36:54 | 22°98 | 2-43 16°01 78 | 1°25 | 10° 8°26 79 | 1°51 99°86 
Clach-an-Eoin, ' r 2°96 || 35°85 | 21°54 | 4:48 18°31 81 | 1:25 8:08 | 7°76 ‘79 | 1:96 || 100°33 
Kinnaird Head, ; 5 3°13 || 85°67 | 17:95 | 7-19 18°06 | 2° 1°4 1°5 9°27 | 3°81 | 3:2 100°05 
Cove, . ‘ : ; nee 35°47 | 18°8 4°61 | 19°19 64 9 7°01} 8:19 24 | 4:97 100°02 
Nishibost, . ; ‘ 3°05 || 35°15 |16°7 | 5-96 19°06 |} 1:02 "82 7°46 | 9°24 | 1:26 | 3-13 99°81 
Lairg, : ; : ae 35°56 | 16°69 | 1°88 | 18-04 Hoe) |] tO) 8°47 | 9°9 SIS |) fase7fal 99°77 
Portsoy, ; : : 3°07 || 34:08 | 17 34] 3-61 18°70 ‘88 | 3°23 | 10°54] 6°78 | 1 19 | 4:05 99°9 
Ben Stack, . 5 ; 3°05 || 35°69 | 20:09 | 2-23 14:01 | 1° 1:89) | 14°77 | 7°38 "BS | DAZ 100°06 
The two micas which follow, though probably belonging to the same species, 
are, on account of their differing somewhat from the others, meanwhile placed 
apart. 
13. The first oceurs on the west coast of Sutherland, about a mile and a- 
half south of the lighthouse at Cape Wrath. 
In two of the small indentations of the coast, beds of the red conglomerate 
are to be seen covering the tilted strata of the hornblendic gneiss. The more 
southerly of these little bays may be additionally recognised by several striking 
granitic veins which intersect the dark hornblendic rock. On the north side of 
an indentation immediately to the south of this, a bronzy mica is to be found, 
plentifully interspersed in a brownish white felspar (oligoclase), 
Its physical characters are the same as those of the micas already noted: 
It is in rich dark-brown crystals of an inch in size. It seemed slightly altered 
at the edges, but these were cut away from the portions analysed ; still from 
