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.

According to Mohs scale, popular countertop materials would be rated and ranked in this order: Soapstone – 1 Marble – 3-5 Limestone – 3-5 Sandstone – 6-7 Granite – 6-8 Quartz – 7-8 Of

Apatite is said to be as hard as glass or a knife. 6: Granite is classified as the sixth hardest material per the Mohs scale. Also ranked this high is orthoclase, a gemstone that becomes igneous rock. It's on part with feldspar or steel in terms of hardness.

Surface Material Hardnesses Surface Material Hardness On Mohs Scale Remarks Granite 6-7 Because granite varies in the porosity and composition, the hardness is a range; usually from

Marble countertops have different hardness for mohs. Most common is around 4, that is why we took that as the base. Some Brazilian marble would be close to 5 in hardness. Granite is one of the hardest natural stone materials. Granite hardness would be 6 and over. It would not be possible to scratch granite countertops using a knife.

All architectural stone is graded to fall somewhere on the Mohs Scale of Hardness, with talc on the very soft end and diamond on the very hard end.

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A mineral of unknown hardness can be tested against one of the standard minerals listed below. Whichever one scratches the other is harder and if both scratch each other they are both the same hardness. Granite is rated 6 on the Mohs scale. Engineered Stone 1.

Granites, like the Black Granite that we work with, rate between 6 and 7 on the Mohs scale. A knife will do virtually nothing to a stone this 

Countertop stones are ranked for hardness on the Mohs scale as below: Soapstone - 1. Marble - 3-5. Limestone - 3-5. Sandstone - 6-7. Granite - 6-8. Quartz - 7-8. Harder countertops will be more durable, so if you want durability choose a granite or quartz slab for your kitchen or bathroom countertop. Here at Kol Marble and Granite

Mohs Hardness Kit: A Mohs Hardness Scale kit containing: (1) talc; (2) gypsum; (3) calcite; (4) fluorite; (5) apatite; (6) orthoclase; (7) quartz;