Which mineral can be easily scratched by a fingernail, has cleavage, metallic luster and a black streak?

Galena

Explanation:

Galena usually occurs in cubic crystals. If you hit a specimen of galena with a hammer it will shatter into small perfect cubic crystals. It has a metallic luster and a black to dark gray color and streak. Galena has a hardness of about 2.5 on the Mohs hardness scale which is about as hard as your fingernail.

galena

If you hit a specimen of galena with a hammer it will shatter into small perfect cubic crystals. It has a metallic luster and a black to dark gray color and streak. Galena has a hardness of about 2.5 on Mohs hardness scale which is about as hard as your finger nail.

Explanation:

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answer(c); cultural values may have affected jack's grandmother's and aunt's belief about extended family;