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