1. Rock Test 1
Write down details on each rock as seen under PPL and XPL on the worksheets provided for you ; then identify the rock type (igneous/ sedimentary/metamorphic) and name the rock.
under PPL and XP
grain type (crystalline or fragmental)
grain size (coarse, medium, fine)
grain shape (rounded, angular, variable)
grain relationships (grains/crystals of similar size;
large crystals in fine matrix; grains/crystals
randomly distributed; crystals lined up in one
direction)
minerals present (identified by & % in rock)
other features (fossils present, muddy matrix, glass)
colour under PPL (mainly light or dark)
colour under XPL (mainly grey/black or brightly coloured)

2. The ROCKS to choose from : (not given in this order)
granite
diorite
gabbro
dolerite
basalt
shelly limestone
sandstone
arkose
greywacke
marble
schist

3. PPL XPL Rock 1

4. PPL XPL Rock 2

5. PPL XPL Rock 3

6. PPL XPL Rock 4

7. PPL XPL Rock 5

8. PPL XPL Rock 6 has been rotated 40o in XPL view

9. PPL XPL Rock 7

10. PPL XPL Rock 8

11. PPL XPL Rock 9

12. PPL XPL Rock 10

13. PPL XPL Rock 11