Civil Engineering - Building Materials - Discussion

5. 

The hardest rock is

[A]. marble
[B]. diamond
[C]. talc
[D]. quartz.

Answer: Option B

Explanation:

No answer description available for this question.

Extra said: (Jul 27, 2014)  
Is diamond a rock?

Subinsekhar said: (Oct 17, 2014)  
Since it is a natural mineral, we can consider diamond as a rock.

Mukunda said: (Aug 13, 2015)  
Answer will be thinner.

Nawaz Ikram said: (Dec 24, 2015)  
Diamonds are not a rock. They are a mineral. Minerals are a "naturally occurring, inorganic (not alive) solid, they also have a crystal-shaped structure.

Rocks are a little different. They contain one or more minerals, but are not minerals themselves. Granite, for instance, is made of quartz and other minerals, often feldspar and biotite.

Mujahid Hussain said: (Mar 18, 2016)  
Diamonds are minerals, and also refined form of mineral which we naturally occurring.

Sreejith Nair said: (Aug 16, 2016)  
A rock formed by only one mineral is called Monomineralic rock and several minerals are polymineralic rock.

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