Mineral hardness is a trademark that is physical can be tried, figured and contrasted and different minerals. One technique is to attempt the hardness of one mineral against another. This is refined through the capacity of a harder material to scratch a milder one.

The Mohs’ Hardness Scale costs the hardness of a mineral general to other individuals. It totally was made by German mineralogist Friedrich Mohs. The Mohs’ Scale is one of a few meanings of hardness in materials innovation. Mohs construct his scale in light of ten minerals that are promptly accessible. The minerals are enlisted in the scale by finding the item that is hardest they can scratch. The Mohs’ scale is relative, not corresponding.

The table underneath looks at Mohs’ hardness to hardness that is absoluteas measured by a sclerometer). The Mohs’ scale is relative, which means it truly is a scale that is simply ordinal records the minerals all together of hardness yet does not indicate contrasts of hardness between your minerals as every mineral is only one unit away through the following. This would demonstrate that Quartz is 7 times harder than Talc and Diamond is just 10 times harder than Talc.

The hardness that is outright is corresponding demonstrating a quantitative distinction between the minerals. This demonstrates Quartz is really 100 times harder than Talc and Diamond is unmistakably 1500 times harder than Talc.

Hardness Material Absolute Hardness
1 Talc (Mg3Si4O10(OH)2) 1
2 Gypsum (CaSO4·2H2O) 3
3 Calcite (CaCO3) 9
4 Fluorite (CaF2) 21
5 Apatite (Ca5(PO4)3(OH-,Cl-,F-)) 48
6 Orthoclase (KAlSi3O8) 72
7 Quartz (SiO2) 100
8 Topaz (Al2SiO4(OH-,F-)2) 200
9 Corundum (Al2O3) 400
10 Diamond (C) 1500

Testing the Gemstone Hardness of Minerals

The sclerometer (from the Greek word skleros meaning “hard”) is a mineralogist’s instrument used to measure the hardness of minerals

The tool was created to determine the amount of hardness of a given mineral by applying pressure on a diamond that is moving until a “scratch” has occurred.

Different types of Gemstone Hardness Testing – you will find four methods that are typical evaluation the hardness of materials. They are the sclerometer technique introduced by Turner in 1896; the scleroscope method recently created by Shore; the indentation test adopted by Brinell about 1900; and the drill test introduced by Keep a years that are few. Turner’s Sclerometer could be the method used to try the hardness of minerals. One other three methods are generally utilized to try metals only instead of minerals.

Turner’s Sclerometer – In this form of test a diamond that is weighted is drawn, once forward and once backward, over the smooth area of the material to be tested.

The hardness number is the weight in grams needed to produce a scratch that is standard.

The scratch chosen is one that will be simply visible to the naked eye as a dark line on a bright surface that is showing. It normally the scratch which could just be felt with all the edge of a quill when the latter is drawn throughout the surface that is smooth right angles to a set of such scratches produced by regularly increasing weights.

Gem Hardness Info Page
Diamond 10  
Ruby 9  
Sapphire 9  
Star Ruby 9  
Star Sapphire 9  
Color-Change Sapphire 9  
Chrysoberyl Cat’s Eye 8.5  
Alexandrite 8.5  
Chrysoberyl 8.5  
Topaz 8  
Rutile Topaz 8  
Azotic Topaz 8  
Mystic Topaz 8  
Spinel 8  
Imperial Topaz 8  
Emerald 7.5 – 8  
Andalusite 7.5  
Hambergite 7.5  
Aquamarine 7.5 – 8  
Goshenite 7.5 – 8  
Cat’s Eye Aquamarine 7.5 – 8  
Beryl 7.5 – 8  
Morganite 7.5 – 8  
Demantoid Garnet 7 – 7.5  
Quartz Cat’s Eye 7  
Amethyst 7  
Cat’s Eye Tourmaline 7 – 7.5  
Smoky Quartz 7  
Quartz 7  
Tourmaline 7 – 7.5  
Star Lemon Quartz 7  
Rose Quartz 7  
Ametrine 7  
Kunzite 7  
Citrine 7  
Mystic Quartz 7  
Paraiba Tourmaline 7 – 7.5  
Danburite 7 – 7.5  
Strawberry Quartz 7  
Aventurine 7  
Rutile Quartz 7  
Chrome Tourmaline 7 – 7.5  
Dumortierite Quartz 7 – 8.5  
Iolite 7 – 7.5  
Rubellite Tourmaline 7 – 7.5  
Tanzanite 6.5 – 7  
Peridot 6.5 – 7  
Mali Garnet 6.5 – 7.5  
Jasper 6.5 – 7  
Axinite 6.5 – 7  
Chrysoprase 6.5 – 7  
Fossil Coral 6.5 – 7  
Dendritic Agate 6.5 – 7  
Spessartite Garnet 6.5 – 7.5  
Fire Agate 6.5 – 7  
Tiger’s Eye 6.5 – 7  
Grossularite Garnet 6.5 – 7.5  
Agate Geode 6.5 – 7  
Star Rose Quartz 6.5 – 7  
Ruby-Zoisite 6.5 – 7  
Star Garnet 6.5 – 7.5  
Idocrase 6.5  
Color-Change Garnet 6.5 – 7.5  
Hiddenite 6.5 – 7  
Agate 6.5 – 7  
Melanite 6.5 – 7  
Zircon 6.5 – 7.5  
Color-Change Diaspore 6.5 – 7  
Bloodstone 6.5 – 7  
Hessonite Garnet 6.5 – 7.5  
Tiger’s Eye Matrix 6.5 – 7  
Cat’s Eye Diaspore 6.5 – 7  
Spodumene 6.5 – 7  
Tsavorite Garnet 6.5 – 7.5  
Almandine Garnet 6.5 – 7.5  
Peanut Wood 6.5 – 7  
Onyx 6.5 – 7  
Carnelian 6.5 – 7  
Pyrope Garnet 6.5 – 7.5  
Chalcedony 6.5 – 7  
Rhodolite Garnet 6.5 – 7.5  
Sillimanite Cat’s Eye 6.5 – 7.5  
Andesine Labradorite 6 – 6.5  
Star Moonstone 6 – 6.5  
Prehnite 6 – 6.5  
Labradorite 6 – 6.5  
Rainbow Moonstone 6 – 6.5  
Rainbow Pyrite 6 – 6.5  
Sunstone 6 – 6.5  
Moonstone 6 – 6.5  
Sugilite 6 – 6.5  
Clinohumite 6  
Maw-Sit-Sit 6 – 7  
Cassiterite 6 – 7  
Kyanite 6 – 7  
Star Sunstone 6 – 6.5  
Jadeite 6 – 6.5  
Nephrite Jade 6 – 6.5  
Orthoclase 6 – 6.5  
Amazonite 6 – 6.5  
Cat’s Eye Scapolite 5.5 – 6  
Moss Opal 5.5 – 6.5  
Hematite 5.5 – 6.5  
Nuummite 5.5 – 6  
Moldavite 5.5  
Opal Doublet 5.5 – 6.5  
Fire Opal 5.5 – 6.5  
Rhodonite 5.5 – 6.5  
Scapolite 5.5 – 6  
Boulder Opal 5.5 – 6.5  
Opal 5.5 – 6.5  
Sodalite 5.5 – 6  
Hackmanite 5.5 – 6  
Sphene 5 – 5.5  
Lapis Lazuli 5 – 6  
Tremolite-Hexagonite 5 – 6  
Hemimorphite 5  
Star Diopside 5 – 6  
Smithsonite 5  
Cat’s Eye Apatite 5  
Turquoise 5 – 6  
Snowflake Obsidian 5 – 5.5  
Apatite 5  
Chrome Diopside 5 – 6  
Obsidian 5 – 5.5  
Tashmarine Diopside 5 – 6  
Larimar 4.5 – 5  
Gaspeite 4.5 – 5  
Charoite 4.5 – 5  
Rhodochrosite 4  
Variscite 4 – 5  
Ammolite 4  
Fluorite 4  
Azurite 3.5 – 4  
Malachite 3.5 – 4  
Sphalerite 3.5 – 4  
Calcite 3  
Coral 3 – 4  
Verdite 3  
Lepidolite 2.5 – 3  
Pearl 2.5 – 4.5  
Chrysocolla 2 – 4  
Seraphinite 2 – 4  
Amber 2 – 2.5