Page 454 - Laboratory Manual in Physical Geology

GEOTOOLS
0
SHEET 1
VISUAL ESTIMATION OF PERCENT
AGI-NAGT Laboratory Manual in Physical Geology 3 9 1
1
0
cm
2
cm
2
5% 15% 45% 85% 5 8 3
4

4
6

7
6
7 5
8
7

First cut along 93° galena halite, 90° 8
dashed line (augite) (orthoclase) K-feldspar
6 9
Then cut out 87°
pyroxenes
each red 56°
triangle (hornblende) 10
or amphiboles
CUBIC (3 at 90°)
PRISMATIC (2 at 90°) PRISMATIC 124° 5 AGI-NAGT Laboratory Manual in Physical Geology 11
94°
PRISMATIC
(2 near 90°)
plagioclase
feldspar
86° (2 at 56° and 124°) 12
Cleavage Goniometer at (6 60° 13

14
105° RHOMBOHEDRAL (3 at 75° and 105°) AGI - NAGT at 120° and 60°) 60° and 120°) DODECAHEDRAL sphalerite 4 15

calcite, 75° OCTAHEDRAL at 71° and 109° 4 main cleavages [Secondary cleavages 120° 3 16
dolomite

17
109° fluorite 71° 18

2 19
0 1 cm 2 3 4 5 6 7 8 20
GEOTOOLS
SEDIMENT GRAIN SIZE SCALE Cut out these 21
AGI-NAGT Laboratory Manual in Physical Geology tools or make
copies of them
1/256 mm 1/16 mm 1
0.0039 mm 0.0625 mm 2.0 mm for your 22
personal use.
CLAY SILT SAND GRAVEL
Fine Coarse 23
No
visible inches
grains 24
0