John scratched a piece of unknown mineral in a glass plate. He observed that it produced a powdery substance. What property of mineral did he test?
a. streak
b. color
c. specific gravity
d. hardness
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John scratched a piece of unknown mineral in a glass plate. He observed that it produced a powdery substance. What property of mineral did he test?
a. streak
b. color
c. specific gravity
d. hardness
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Answer:
d. hardness
Explanation:
Hardness (H) is the resistance of a mineral to scratching. It is a property by which minerals may be described relative to a standard scale of 10 minerals known as the Mohs scale of hardness. The degree of hardness is determined by observing the comparative ease or difficulty with which one mineral is scratched by another or by a steel tool. For measuring the hardness of a mineral, several common objects that can be used for scratching are helpful, such as a fingernail, a copper coin, a steel pocketknife, glass plate or window glass, the steel of a needle, and a streak plate (an unglazed black or white porcelain surface).