IGNEOUS AND CRYSTALLINE ROCKS. 17 
L. Basic segregation in diorite. Akerose. Contains hornblende, augite, biotite, 
plagioclase, magnetite, apatite, zircon, and a little quartz. P. R. C. 1346. 
M. Diabase. Auvergnose. Contains plagioclase, augite, and magnetite. P. R. 
C. 1351. 
N. Camptonite. Camptonose. Contains brown hornblende, plagioclase, a little 
augite, olivine, magnetite, and apatite. P. R. ©. 1350. 
O. Phyllite. Contains quartz, sericite, graphite?, magnetite, pyrite, rare ortho- 
clase, plagioclase, sphene, and rutile. A quartz-sericite schist. P. R.C. 1352. 
P. Cordierite-microperthite hornfels. Akerose. Contains biotite, quartz, red 
garnet, corundum, magnetite, iolite, microperthite, and rarely pleonaste. 
Q. Cordierite hornfels. Contains quartz, biotite, pleonaste, corundum, iolite, 
magnetite, plagioclase, red garnet, and epidote?. 
us M N. oO P Q 
55.28 | 49.63 | 48.22] 90.91 58. 35 45. 30 
17.23 | 14.40 | 14.27 4.18] 21.30 30. 51 
1.54 2. 85 2. 46 - 03 24 
6. 23 8. U6 9.00 1.27 6. 41 8. 80 
2. 69 7.25 6. 24 37 2.10 3.11 
5. 60 9. 28 8. 45 85 -90 
5. 42 2.47 2.90 77 1.60 1.65 
DD oe ccinies aya aitaseceatens ie caciaveptiend: 22 are qe sCeians See eee Mage Sr 2.12 -70 1.93 58 5.63 4.84 
T20 at 110°...... sis ste - 20 27 28 06 31 26 
a 71 1.47 1. 66 74 . 86 1.05 
TiOgeces seen 1.64 1.68 2.79 28 - 87 1. 48 
POs. - 73 +25 64 05 -18 12 
ZTOz. trace | trace? 03 02} none none 
MV OW: Siig Bah aisle tera aaStyahscagthe coh BLD cag ahs dak Maat ltine Sata -24 yg -20| trace .13 20 
GNICG) Oia 2 ae cA AA ete ehot senator aa Sas oate den sacs (?) -04 .03 | none 03 02 
NO arate tae ave SARE Sk NO eee ER As a area le va tes Seid 06 | trace? -04 | trace 05 03 
OO ais capatagernsd Baten cio seen lead eee Be aed OOo erat 04 1. 36 15 UB | ceciarerereyats | wteretnsieians 
Cia suchcnaeee maton pseanscsie Sea zed ithantanee ea a ctascrddernschs a Bicheiattwfereiarats So ah alal ais here] esiaisrerscendl iim aerators 10 -40 17 
SO3. none | none/ none} none|} none 04 
Clee 07 0 wlO! | omeenises 03 04 
Binz snes 28 | trace -05 | trace (?) 04 
HOS o2 voc oe actetie oy chkematawt a seedeasenke peesieewieeke 07 - 36 ll 58 1.07 
100.15 | 100.17 | 99.80 | 100.06 | 99.71 99. 87 
TOSS 7Oiic 25 52 ScntaGpacaeasd Scueteneis ne Setanta eens omens 13 0! 04 Nn eetcalaeodene| aeeacien 
100:'02:) 100i15. | 99.76 |.o.ccsccclewescens| saemases 
In these rocks the sulphur is all reckoned as pyrite, although pyrrhotite also is prob- 
ably present. The carbonic acid represents either dolomite or siderite; not calcite. 
Traces of lithia and strontia occur in nearly all. Samples H, L, O, and Q contain 
traces of copper. In N there is 0.03 V, 03, asupplementary determination by Hille- 
brand. 
2. MISCELLANEOUS ROCKS. 
A. Amphibolite, Guilford. Described by Emerson in Mon. XXIX. Contains 
hornblende needles, with albite and rutile. Analysis by L. G. Eakins, record No. 
1326. P.R.C. 1615. 
B. Granitoid gneiss, north of Lincoln’s. 
C. The same, west slope of Little Peco. 
D. Chloritic granite. Yellowstonose. East Clarendon section. 
E. Hornblende granite. Hessose. East Clarendon. 
Rocks B, C, D, and E collected by C. L. Whittle, but not described. Analyses by 
H. N. Stokes, record No, 1396. 
