38 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
GEORGIA. 
Rocks collected by A. H. Brooks, who supplies the petrographic data. Analyses 
by H. N. Stokes. Record No. 1727. 
A. Meta-quartz diorite, 2 miles southwest of Sweden, Gordon County. Gordonose. 
Contains plagioclase, near labradorite, green hornblende, sometimes diallage, much 
vitreous quartz, and accessory magnetite, ilmenite, and orthoclase. Also secondary 
epidote, zoisite, uralite, chlorite, garnet, calcite, and leucoxene. P. R. C. 1530. 
B. Augite-microcline granite, 1 mile east of Rowland, Bartow County. Toscanose. 
Contains microcline, some plagioclase, abundant pyroxene partly‘altered into chiefly 
uralite and chlorite, some biotite with frequent inclusions of rutile, much blue vitre- 
ous quartz, apatite, zircon, and magnetite. P. R. C. 1531. 
C. Quartz gabbro, 2 miles southeast of Walleska, Cherokee County. Harzose. 
Closely related to B. Contains essentially plagioclase, near labradorite, and augite. 
Accessory magnetite, ilmenite, apatite, and zoisite. Orthoclase is sparingly present. 
Quartz occurs in vitreous masses. P. R. C. 1532. : 
A B. C 
GEO ae sicictctccarnanelecai naciahe sraieectavereee ae taicnate Vote Ryd aS Rea Saeeaats 69.87 | 67.98 56. 20 
FANG O 5 jasc ciececvevarmeteictne Ae Lisimerax-orsiausiaiaetfermnnaaid GIRS ESiasbem taney ie AAS aae Lake HNL 12.02] 14.84 15. 46 
Bb O gia crest ale tetera seensencnaieenaey 1. 42 1.00 1.54 
FeO. 3. 49 3.15 9.76 
MgO 2. 30 91 1.83 
CaO. 7. 86 2.17 5.39 
Na2O 66 2. 66 2.78 
Ke Oh soc cre desma sAiienicie sidicyain crcetininis Baie Bh F3, RESER RING oe oo erNRINlaRiaae aclamiererors wll, 4.76 2. 56 
EReQ sat 110% oo 2: ycicider caeeissectaiciniemusiecises ood hleeeRees Be See mai eeer ede 18 -14 -16 
FsOrabOve V0? 2 cseiickacosaitemeesciend s teeeeaescueuaide 12 Bee aees weeeteeees: - 89 49 - 59 
THO) castes se, atten Syd wine cecfaperagaqndeg sie 2 2 Sree essen eae so seiaie is ake eectnitcarei eels 69 84 2. 25 
ai. 34 1.13 
trace -13 
= 20 Vv 
KENTUCKY. 
1, ELLIOTT COUNTY DIKE. 
Described by Diller in Bull. 38. Also in Am. Jour. Sci., 3d ser., vol. 32, p. 125. 
A peridotite, var. kimberlite, consisting largely of olivine, sometimes altered to 
serpentine. Pyrope, ilmenite, a few scales of biotite, a little enstatite, and a trace 
of apatite are present as primary minerals. Secondary minerals are serpentine, 
dolomite, magnetite, and octahedrite. 
A granitic rock occurs with the peridotite. It consists chiefly of feldspar, ortho- 
clase, and plagioclase, with a considerable amount of quartz and ilmenite, and traces 
of hornblende, sphene, and apatite. 
Analyses by T. M. Chatard, record Nos. 272, 273, 282, 305, 351, 352, 353, 354, and 358. 
A. Granite. Monzonose. 
B. Peridotite (kimberlite). P. R. ©. 799. 
(, Olivine from peridotite. 
D. Garnet from peridotite. 
E. Ilmenite from peridotite. 
