Which of the following best characterizes ferromagnesian silicates?
A) They contain iron and magnetite, are black in colour, and they have metallic lustres.
B) They are high temperature black to dark-green minerals containing iron and magnesium.
C) They are mostly dark, heavy, and rich in the elements manganese and ferron.
D) They are dark and have a Mohs hardness greater than 7.
Correct Answer:
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