Question

directions: use the data from the table to create a bar graph that shows the density (g/ml) of each rock or mineral. use one bar column for each sample. accuracy and neatness counts. use colored pencils if possible.
*numbers are estimated only and are not intended to be a reference source.
1 which mineral has a white streak and has a glassy luster? (1) pyrite (2) hematite (3) olivine (4) graphite
2 the volume of a sample of pyrite was measured to be 4.0 ml. based on the equation for density below, what is the mass of this sample? density = mass/volume (1) 1.2 g (2) 1.2 ml (3) 20 g (4) 20 ml
3 which two minerals are the closest in luster, density and hardness? (1) pyrite and halite (2) graphite and talc (3) quartz and pyrite (4) olivine and hematite

Explanation:

Step1: Solve question 1

Check table for white - streak and glassy - luster. Quartz has a white streak and glassy luster.

Step2: Solve question 2

Use density formula $\text{Density}=\frac{\text{Mass}}{\text{Volume}}$. Given pyrite density is $5.0\ g/ml$ and volume is $4.0\ ml$. Rearrange for mass: $\text{Mass}=\text{Density}\times\text{Volume}=5.0\ g/ml\times4.0\ ml = 20\ g$.

Step3: Solve question 3

Compare luster, density and hardness of each pair. Pyrite has metallic luster, density $5.0\ g/ml$ and hardness $6.0 - 6.5$. Hematite has metallic luster, density $5.6\ g/ml$ and hardness $1$. Quartz has glassy luster, density $2.7\ g/ml$ and hardness $7$. Olivine has glassy luster, density $3.4\ g/ml$ and hardness $6$. Graphite has dull luster, density $2.3\ g/ml$ and hardness $1 - 2$. Talc has dull luster, density $2.8\ g/ml$ and hardness $2.5$. Halite has shiny luster, density $2.2\ g/ml$ and no hardness value given. Olivine and hematite have some similarities in density and hardness compared to other pairs.

Answer:

1. (3) quartz
2. (3) 20 g
3. (4) olivine and hematite