Correction: The mineral chalcopyrite usually is found...

[Rajesh]

The mineral chalcopyrite usually is found in compact masses or in mixture with various other mineral as opaque, brass-yellow tetragonal crystals.

Please correct

TOEFL listening discussions: A conversation between two students at the library

[Torsten]

The mineral chalcopyrite usually is found in compact masses or in mixtures with various other minerals as opaque, brass-yellow tetragonal crystals.

TOEIC listening, photographs: A horse guard parade in London

[Pezastic]

The mineral chalcopyrite is usually found as opaque, brass-yellow tetragonal crystals in compact masses or in mixtures with various other minerals.