Why is granite harder than sandstone?

User Avatar
Wiki User
March 23, 2010 10:59PM

Granite is composed of interlocking grains, a result of minerals solidifying at different temperatures as they cool from magma. This interlocking structure makes granite very durable and hard. Sandstone is formed of cemented sand sized grains. The bond between grains is not as strong as the interlocking grain found in granite.