Question

1. which mineral has a different common color from its color in powdered form? a) brazilite b) canallite c) magnetite d) olivine 10.which mineral might scratch the mineral fluorite, but would not scratch the mineral amphibole? a) brazilite b) magnetite c) canallite d) olivine mineral chart mineral name composition density (g/cm³) hardness streak non - metallic luster common colors brucite mg(oh)₂ 2.4 2.5 - 3 white glassy to waxy white olivine (mg,fe)₂sio₄ 3.3 6.5 green glassy green kaolinite al₂si₂o₅(oh)₄ 2.6 white white shades of pink glassy to waxy calcite caco₃ 2.8 3.5 - 4 white white glassy magnetite fe₃o₄ 5.1 3.5 - 4.5 white white glassy

Explanation:

To answer question 9, we look at the streak property in the mineral chart. Streak is the color of the powdered form of a mineral. Magnetite has a black streak while its common color can be black or brown - so it has a different color from its color in powdered form. For question 10, we consider the hardness values in the chart. Fluorite has a hardness of 4. Minerals with a higher hardness can scratch those with a lower hardness. Apatite has a hardness of 5 and can scratch fluorite, while calcite (hardness 3) cannot scratch fluorite.

Answer:

1. C. magnetite
2. A. apatite