Mineral Identification Physical Tests practice quiz

Which diagram illustrates the streak test?

• Test A

• Test B

• Test C

Answer explanation

Test B illustrates the streak test, which involves rubbing a mineral across a porcelain plate to observe the color of the streak it leaves. This is a key method for identifying minerals.

Which diagram illustrates the hardness test?

• Test A

• Test B

• Test C

Answer explanation

Test C illustrates the hardness test, as it typically shows the method of measuring a material's resistance to deformation. Tests A and B do not represent this specific testing process.

Test A is used to determine a mineral's

• shape

• color

• texture

• cleavage

Answer explanation

Test A is specifically designed to assess a mineral's cleavage, which refers to how it breaks along specific planes. This property is crucial for identifying minerals, unlike shape, color, or texture.

A carpenter's nail has a hardness of about 5. It will scratch

• quartz (hardness 7)

• feldspar (hardness 6)

• diamond (hardness 10)

• calcite (hardness 3)

Answer explanation

A carpenter's nail has a hardness of 5, which means it can scratch materials with a lower hardness. Calcite, with a hardness of 3, can be scratched by the nail, while quartz (7), feldspar (6), and diamond (10) cannot.

What characteristics does a piece of quartz have that can be used to classify it as a mineral?

Answer explanation

Quartz is classified as a mineral due to its natural occurrence, inorganic composition, crystalline structure, and specific chemical formula (SiO2). These characteristics distinguish it from other substances.

Tags

NGSS.MS-PS1-1

Could you tell samples of all minerals apart just by using a scratch test? Why or why not?

Answer explanation

No, you cannot distinguish all minerals solely by a scratch test because many minerals can have similar hardness levels. Additional tests, such as streak, luster, and cleavage, are often needed for accurate identification.

When diamonds are shipped to jewelry stores, they are individually wrapped in paper. Explain why the paper is needed to protect each diamond from damage.

Answer explanation

The paper wrapping protects each diamond from scratches, chips, and other physical damage during transport. Diamonds are hard but can be brittle, so the paper acts as a cushion to prevent contact with other objects.

Identify the mineral in the table that is hard, has a black streak, and has no reaction with acid.

Answer explanation

The mineral that is hard, has a black streak, and shows no reaction with acid is likely to be horneblend. Its properties match the criteria given in the question.

Compared to the chalcopyrite, which property of galena is different?

Answer explanation

Galena differs from chalcopyrite primarily in its composition; galena is primarily lead sulfide (PbS), while chalcopyrite is copper iron sulfide (CuFeS2). This leads to differences in density and metallic properties.

Tags

NGSS.MS-PS1-2

Describe the test for determining the streak of most minerals.

Answer explanation

The streak test involves rubbing a mineral across a porcelain streak plate to observe the color of the powder it leaves behind. This color can help identify the mineral, as it is often more consistent than the mineral's external color.