Question

question 12 (2 points)
luster can be described as vitreous, earthy, or waxy.
true
false
question 13 (2 points)
density is calculated by dividing mass by volume.
true
false
question 14 (2 points)
color is the best way to identify a mineral. (remember the virtual mineral identification lab you did with this lesson.)
true
false
question 15 (2 points)
glass is made from hornblende.
true
false

Explanation:

• Question 12: Luster describes how light reflects off a mineral's surface. Vitreous (glass - like), earthy (dull, clay - like), and waxy are common luster descriptions.
• Question 13: The formula for density is \(d=\frac{m}{V}\), where \(d\) is density, \(m\) is mass, and \(V\) is volume.
• Question 14: Color can be variable in minerals due to impurities. Other properties like hardness, cleavage, and streak are often more reliable for identification.
• Question 15: Glass is mainly made from silica (sand, \(SiO_{2}\)), not hornblende (a silicate mineral with a different composition).

Answer:

• Question 12: A. True
• Question 13: A. True
• Question 14: B. False
• Question 15: B. False