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Have a closer look at the dark minerals. You will recognize two different types:

Black, opaque, often with very small reflecting features (crystal faces, cleavage planes) – this are mafic minerals, e.g., Amphiboles or Pyroxenes or potentially some Biotite, however that is hard to tell with the outcrop alone.
Very dark grey, translucent/transparent, crystals show conchoidal fractures

What name would you give the second mineral?