Question

How do octahedral seed crystals yield polyhedral Cu₂O crystals?

Answer 1

It would seem that by very slight changes in conditions they can get the crystals to grow either at 8 corners, giving a cube, or 6 corners, giving an octahedron, or even somewhere in between, giving 14 facets. How they get 50 facets is beyond me. That would be 4x(8)+3x(6)=32+18=50 I guess. Iron pyrites is cubic and has several different growth habits, which can lead to stripy-faced crystals.

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Answer 2

Explanation:

A reducing sugar reduces the copper hydroxide to Cu2O.

• The ethanol dissolves the sodium acetate to leave only Cu2O (octahedral) crystals.

• The next morphology of Cu2O crystals, "polyhedral M-pyramid Cu2O architecture,"

• was grown through essentially the same process, except using seed crystals from the first batch of octahedral crystals.