Samples from a granitic pegmatite consisting predominantly of plagioclase feldspar and biotite against a black background.
Schlüsselwörter
pegmatite,
feldspar,
mica,
mineral,
crystal,
geology,
black background,
nature,
science,
sample,
specimen,
south africa,
white,
dark brown,
collection,
crystalline,
igneous,
rock,
petrology,
crystallography,
shiny
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