You can use a knife to verify whether the slab is really granite by scratching the surface with it. If you can’t make a mark or it’s difficult too then it’s highly likely that it’s granite. For the chemical test, pour a bit of lemon juice onto the tile and see whether it stains. As long as it’s been sealed, it’s a low maintenance countertop.

Granite Vs Marble. Hardness and Durability: Granite is harder than marble, so it is more resistant to chips and scratches. Both marble and granite countertops are quite durable, but only if they are properly sealed every one or two years. Granite and marble are porous, so without a seal, liquids will penetrate and stain. How Is Marble Made

Friedrich Mohs, in 1812, created a scale that's still used to compare the hardness of various materials today. This is called the Mohs scale 

As awesome as it would be to have a diamond-studded countertop, here's why this information is important when it comes to choosing the strongest material for this particular surface: Granite, which is a composite of feldspar and quartz, ranks at a "6" for its hardness.

2. Granite is one of the hardest substances in the world. The only material that is harder than granite is a diamond. The hardness of granite makes it durable 

However, granite is still vulnerable to staining. Granite has a Mohs hardness rating of seven. Marble Marble is limestone that has been compacted and heated over millions of years. As a result, marble is less porous and slightly stronger than limestone, but still less durable than granite.

Many type are NOT granite, but any one of a number of other stones, often of varying hardness. The 'quartz' counters (actually sand in a binder) depend on the binder for their scratch resistance. If you go after them with a material stronger than the binder you will introduce scratches by removal of the quartz.

Granite found in India is known for its hardness and beauty. In Fact, India is one of the leading exporters of all types of granite. The type of Granite in India can be categorized on the basis of region and color. On the basis of region, granite can be classified into South India Granite and North India Granite.

Though the composition of various granite colors and varieties will vary from slab to slab, granite is generally is made up of a quartz, feldspar and an assorted variety of minerals, evoking a gritty look. However, granite is still vulnerable to staining. Granite has a Mohs hardness rating of seven.

For example, granite is known to be one of the hardest natural stones available today for people. How hardness is measured? The hardness of any mineral is 

The Formation of Granite. The process of how the Earth churns the molten ingredients is what determines the makeup of the rock. · Hardness Rating.