J. D. Dana—Rock notation for Geological Diagrams. % 
Il. Hornblendic rocks, containing meres Phi or with quartz 
or 
Pee aewEene es ate 
beled radar i 
b Raat rnp bes ects 
ATER EPTRE HD 
AAAS AEH Aen Hen Me 
orthoclase, or with b 
1. Syenyte. 
2. Quartz-syenyte. 
3. Hornblende schist. 
4, Hornblende schist with little or no ortho- 
* clase. 
5. aeghewwor aie Podceoaget bedding: the symbol » without al- 
ternate r 
a 
6. Syenyte or socahueds gneiss: same as 2, with a rule at. 
intervals of 2 to 4 lines of symbols. 
III. Rocks containing a triclinic feldspar (plagioclase) with 
h 
RKB SRN 
MERWE MARKER KA 
BAMRAK AKAM HARK 
MAK BRXRK DK AK DA 
NARA KH HMR DE 
XRAY RMAN HR He 
ne R 
XR YR MH 
met 
tee bas ixakuxoe 
ie folie eg alot alae 
AWK UR DRUM EE 
ornblende, augite, hypersthene. 
1. Dioryte. 
2. Dioryte schist. 
8. Quartz-dioryte. 
4, Hemidioryte (mica-dioryte) containing 
quartz. 
5. Labradioryte (labradorite dioryte), anor-. 
thite-dioryte 
6. Andesyte. 
7. Augite-dioryte. 
8. Doleryte, diabase, gabbro. 
9. aahirenttes without quartz (mica-dioryte): like 4 with the 
ted. 
tom 
10. Augiteandesite: like 6 with w in Sms of n. 
ll. Nor oryte: like 
with y in place o 
12. Dacyte: like 4 with the symbol for glass added, 
13. Basalt: like 8 with the symbol for glass added. 
