Minerals are aligned by pressure forming slaty cleavage.
Question 9
Question
Complete the following statements about schist:
It contains large garnet [blank_start]porphyroblasts[blank_end].
The alignment of [blank_start]muscovite[blank_end] is 90 degrees to the pressure.
Answer
porphyroblasts
muscovite
Question 10
Question
Complete these statements about gneiss:
[blank_start]Gneissose banding[blank_end] forms.
Dark bands are made of [blank_start]mafic minerals[blank_end] eg. [blank_start]biotite[blank_end].
Light bands are made of [blank_start]quartz[blank_end] and [blank_start]k feldspar[blank_end].
Answer
Gneissose banding
Schistosity
silicic minerals
mafic minerals
muscovite
quartz
biotite
quartz
calcite
plagioclase feldspar
potassium feldspar
Question 11
Question
The spots in spotted rock are made of black organic material or biotite.
The texture of marble is described as [blank_start]sugary[blank_end].
If their were impurities in the parent rock then [blank_start]coloured streaks[blank_end] will be visible in the marble.