Minerals are aligned by pressure forming slaty cleavage.
Frage 9
Frage
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.
Antworten
porphyroblasts
muscovite
Frage 10
Frage
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].
Antworten
Gneissose banding
Schistosity
silicic minerals
mafic minerals
muscovite
quartz
biotite
quartz
calcite
plagioclase feldspar
potassium feldspar
Frage 11
Frage
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.