Question

Which mineral scratches Dolomite and is scratched by Olivine?
1.Galena
2.Quartz
3.Potassium Feldspar
4.Muscovite Mica
Please answer!! 10 points!!

Answer 1

Answer:

Option (3)

Explanation:

The above-given question is based on the Mohr's hardness scale, which shows the hardness of the minerals ranging from 1 to 10, where the mineral with hardness 1 is Talc which is a soft mineral, and 10 is Diamond which is the hardest of all the minerals.

• Dolomite is a mineral which has a hardness of about 3.5 to 4
• Olivine is another mineral with hardness 6.5 to 7
• Galena has a hardness of 2.5 or slightly more than that.
• Quartz has a hardness of 7
• Potassium feldspar has a hardness of 6 to 6.5
• Muscovite mica has a hardness of 2-2.5

So from the above data, we can conclude that Potassium feldspar is the mineral which can scratch the surface of a Dolomite mineral and is scratched by Olivine, because its hardness (6-6.5) is more than Dolomite (3.5-4) but lesser than that of Olivine (6.5-7).

Thus, the correct answer is option (3).

Answer 2

Among the minerals given, the mineral that scratches Dolomite and is scratched by Olivine is: 3. Potassium Feldspar.

A mineral can be defined as any form of naturally occurring, inorganic solid substance that is typically characterized by a crystal structure.

Basically, the properties of a mineral which can be used to test and identify it, include the following:

• Luster.

• Streak.

• Hardness.

The hardness of a mineral can be tested by scratching its surface with a knife or your nails.

Based on the Mohs hardness scale, these are the hardness level of some minerals:

• Dolomite = 3.5 to 4

• Olivine = 6.5 to 7

• Galena = 2.5 or slightly higher.

• Quartz = 7

• Potassium feldspar = 6 to 6.5

• Muscovite mica = 2 to 2.5

From the above data, we can deduce that the hardness level of Potassium feldspar is higher than that of Dolomite, so it can scratch the surface of Dolomite.

However, the hardness level of Olivine is higher than that of Potassium feldspar and as such it can scratch its surface.

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