The Mohs Hardness Scale is a set of ten reference minerals (numbered 1 through 10) that are used to determine the relative hardness of minerals and other 

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 

A gemstone's hardness is a good indicator of how well it will resist scratches and abrasions. The Mohs scale is a not a linear scale.

The Mohs Scale of Hardness ; 10, Diamond ; 9, Corundum (rubies and sapphires) ; 8, Topaz ; 7, Quartz [Example: It scratches window glass] ; 6, Feldspar [Example: A 

Our chart is based on the Janka Hardness Scale which is the industry standard for gauging the ability of various wood species to resist denting and tolerate normal wear. It also indicates the effort required to either nail or saw the particular wood species. The woods are listed from hardest to softest, so the higher the number, the harder the

Mohs Scale of Relative Mineral Hardness · Talc - (Absolute Hardness 1) · Gypsum – (Absolute Hardness 2) · Calcite – (Absolute Hardness 9) · Fluorite – (Absolute 

Jan 04,  · In the past, stones that did not have a certain “gemstone hardness” were generally referred to as semi-precious stones. Today this term is rarely used commercially, as it can be misleading; generally one refers to jewels or jewellery stones. To be a true gemstone, a jewel needs to have a Mohs hardness rating of at least 7.

While the Mohs Scale of Hardness is a good indicator of surface durability, it can be misleading when it comes to a gemstone's overall durability. For example, the emerald has a Mohs rating of 8.0, but it does not wear as well as topaz - which also has a Mohs rating of 8.0 - because of inner inclusions which are so prevalent in emerald gemstones.

In gemology, gem hardness is measured on a scale known as the Mohs scale, which assigns minerals a value between 1 (softest) and 10 (hardest). This scale was 

Mohs hardness, rough measure of the resistance of a smooth surface to scratching or abrasion, expressed in terms of a scale devised (1812) 

Mineral Mohs Hardness Quartz 7 Topaz 8 Corundum 9 Diamond 10