Cameron and Jasmine are identifying minerals using the chart below. They know that quartz is glassy, leaves a white streak, and is very hard. Cameron says that mineral #4 is quartz, but Jasmine says the quartz must be #7. Who is correct? How do you know?
Mineral |
Color |
Streak |
Luster |
Transparency |
Hardness |
1 |
silver |
brown |
metallic |
opaque |
5 |
2 |
gray |
silver |
metallic |
opaque |
2 |
3 |
white |
white |
glassy |
translucent |
3 |
4 |
clear |
white |
glassy |
translucent |
2 |
5 |
gray |
black |
metallic |
opaque |
7 |
6 |
yellow |
yellow |
dull |
opaque |
2 |
7 |
white |
white |
glassy |
translucent |
7 |
Jasmine is correct. #7 has a hardness of 7.