FROM THE KENDAL AND SEDBERGH DISTRICTS. 173 
The rock, then, appears to be a minette-felsite. 
The dyke is in a line of fault in the Bannisdale Slates, being about 
2 or 3 yards wide. It weathers to a ney powdery mass, and is tra- 
versed by numerous calcite veins. 
(7) Dyke 8. of Haygarth, Docker Fell. No. I. 
Characters—— Macroscopic. A compact, very dark purplish-grey 
ground-mass, with numerous scales, generally considerably less than 
0-1 inch, of brown-black mica, with bright lustre. 
Microscopic. A clear ground-mass, containing numerous minute 
belonites, mica-scales, and grains of ferrite, which appears to have a 
micro-crystalline structure throughout. In this are numerous crystals 
of biotite, frequently hexagonal in form, much freer from calcite and 
enclosures than in No. II. There are a few grains of calcite and 
a few of some saussuritic mineral (the former may be a pseudomor- 
phic product after augite, the latter, perhaps, after felspar) and plates 
of mica are around, so as to border them, and, in one or two of the 
larger, small plates are included. There are one or two grains of 
quartz present, generally bordered by a dull granulated ring. They 
contain a few minute cavities. In one case the grain is a compound 
one. Their appearance suggests the possibility of their having been 
caught up by the molten rock. Associated with one of these in a 
part of the slide is a crystal of plagioclase apparently broken up, the 
fragments being twisted into different positions. 
The following is an analysis :— 
\WEIUSER Eee Sieiaere 6 2°35 
CLO) Speke etste Lomita 0-66 
SiO Ped. sre teres sce 58°34 
INO) ae OE ie aE 16°33 
CN OR Wren ee ces. wetter: 2°28 
HCO Rr errata te 3°88 
ADGA? sek aoe y uami ks 0-14 
CaO ee Es a 5°65 
IM ORES Bie 8 he 3°34 
KG OREe Liens TAT AS fe 5:55 
INGA Osea gore cts) avai 2:20 
100-72 
This shows the rock to be a minette-felsite. 
(8) Dyke S. of Haygarth, Docker Fell. No. II. 
Characters.— Macroscopic. A compact ground-mass of a reddish 
chocolate-brown colour, pretty full of scales of mica up to about 
0-1 inch, but occasionally much larger. The mica is of a brown- 
black colour, with a bright, rather silvery lustre. 
Microscopic. A crypto-crystalline, almost glassy base, stained 
brown with ferrite, and containing very many minute scales, as well 
