Monday, February 18, 2013

The Hardness of Stone


Marble is a relatively soft stone. On a measurement of hardness of (MOHS), marble is approximately a three out of ten. Marble is made of calcium, just like your teeth. If you eat something to hard you will break your tooth. If you eat a lot of sugar you will get a cavity. Stone reacts the same way. If an improper chemical is applied to the surface, corrosion will begin to from cavities in the stone.

Listed below is the famous Measurement of Hardness (MOHS) Scale for stone. This is a guide developed in the 1800's, which helps evaluate the strengths and weakness of the stone being used. For example, softer stone would require less active chemical and a more frequent dust-mopping program.


      10     Diamond
      9     corundum
      8     Topaz
      7     Quartz (Granite)
      6     Feldspar (Granite)
      5     Apatite
      4     Fluorite
      3     calcite (Most Marbles)
      2     Gypsum
      1     Talc

The objective of the MOH's Scale is to measure stone resistance to hardness. When sediment and grit harder than the surface, they will scratch and harm the stone. For example, a piece of hard plastic is about a 2.0. It will not scratch #3 calcite (Marble). However, a piece of sand that measures a 6, will scratch #3 calcite but will not scratch #7 Quartz which is Granite. The harder the stone, the more resistant it is to abrasion. Exterior sediment that is tracked in to buildings approximately measures from 3.0 to 7.0.

Compiled by Fnd Stone Advice for the blog

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