The Mohs Hardness Test is one of the most widely used tests for identifying and classifying gems. The test rates a gemstone's hardness on a scale of 1 to 10. To get a numerical value for hardness, the test includes a baseline of 10 minerals that have ascending values for hardness. The minerals contained in the scale include ( from softest to

MOH"S SCALE OF HARDNESS 10 Diamond 9 Corundum 8 Topaz 7 Quartz 6 Feldspar 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc

Mohs Scale Ranking Chart. Diamond is the only mineral with a value of 10, being the hardest mineral. As the graph above shows, there is a large drop from 10 to 9 where the next hardest minerals are categorized (Ruby & Sapphire). However, the graph is not linear, Diamond is actually 3 ½ times harder than Ruby and Sapphire, which in turn are

In this week's tutorial, Mike explains how a gemstone's hardness is measured, and why the number on the scale is important for both a lapidary and a

All gemstones are scaled in hardness from 1-10. 10 is the hardest. Mail Order Gems My Account Shopping Cart (0) Checkout Go Go Home Page New Products Specials My Account Contact Us Gem Hardness scale MOH'S SCALE OF HARDNESS $0.

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Gemstone Hardness ; 7, Quartz (SiO2), 100 ; 8, Topaz (Al2SiO4(OH-,F-)2), 200 ; 9, Corundum (Al2O3), 400 ; 10, Diamond (C), 1500 

Firstly, gemstone hardness. Many people have heard of the MOHS scale. It is a mineral scale of gemstone hardness that starts at 

1/4 · Minerals with a Mohs hardness of 1 to 2 are considered soft, minerals from 3 to 5 are medium-hard, while those minerals with a hardness of 6 or more are hard. Minerals with a Mohs hardness of 7 or more are very hard and this is usually considered to be the minimum hardness to define a gemstone.

Mohs hardness scale, with a lot of minerals reviewed. I searched a while to find a comprehensive list of Mineral hardness and this is the best I could 

What is the Mohs Scale ? : The Mohs scale was developed by German mineralogist Friedrich Mohs and is a scale used by gemologists to classify a gem mineral's