Question

this mineral has the following properties:
luster: answer to question 28
hardness: answer to question 29
breakage: cleavage
color: silver to gray
streak: black streak
other characteristics: distinct greasy feel
using the mineral identification chart, what is the name of this mineral?
potassium feldspar
galena
magnetite
hematite
graphite

Explanation:

Graphite has a metallic - like luster (which could be the answer for question 28), a hardness of about 1 - 2 (answer for question 29), shows cleavage, has a silver - gray color, a black streak, and a greasy feel. Potassium feldspar has a non - metallic luster, a hardness of 6, and a white streak. Galena has a metallic luster, a hardness of 2.5, a gray streak. Magnetite has a metallic to sub - metallic luster, a hardness of 6, and a black streak but no greasy feel. Hematite has a metallic to sub - metallic luster (specular hematite), a hardness of 5.5 - 6.5 for massive hematite, and a reddish - brown streak.

Answer:

Graphite