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Question
Which of the following stones have maximum fire proofing property?
A.
Marble
B.
Limestone
C.
Sandstone
D.
Granite
Answer ( Option C)

Sandstone

Solution

Stones are bad conductors of heat. Most of the stones tend to disintegrate when cooling after being heated by fire. Granites disintegrate under fire. Limestones crumble easily. 
Fine-grained sandstones can resist fire moderately. Among all the given options sandstones, especially the compacted type has more fire-resisting properties. 
Characteristics of Sandstone: 
• It is a type of rock that has quartz, or sand bound together with cementing minerals like mica, feldspar, etc. 
• It is a sedimentary rock. 
• Its color depends upon that of the feldspar. 
• It can be used as a road metal if higher quality stones like basalt and granite are not available. 
• It is fire resistant. Its specific gravity is 2.25. Its crushing strength varies 35 to 40 MN/m2.

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