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.

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

GemHardnessInfo Page
Diamond10 
Ruby9 
Sapphire9 
Star Ruby9 
Star Sapphire9 
Color-Change Sapphire9 
Chrysoberyl Cat’s Eye8.5 
Alexandrite8.5 
Chrysoberyl8.5 
Topaz8 
Rutile Topaz8 
Azotic Topaz8 
Mystic Topaz8 
Spinel8 
Imperial Topaz8 
Emerald7.5 – 8 
Andalusite7.5 
Hambergite7.5 
Aquamarine7.5 – 8 
Goshenite7.5 – 8 
Cat’s Eye Aquamarine7.5 – 8 
Beryl7.5 – 8 
Morganite7.5 – 8 
Demantoid Garnet7 – 7.5 
Quartz Cat’s Eye7 
Amethyst7 
Cat’s Eye Tourmaline7 – 7.5 
Smoky Quartz7 
Quartz7 
Tourmaline7 – 7.5 
Star Lemon Quartz7 
Rose Quartz7 
Ametrine7 
Kunzite7 
Citrine7 
Mystic Quartz7 
Paraiba Tourmaline7 – 7.5 
Danburite7 – 7.5 
Strawberry Quartz7 
Aventurine7 
Rutile Quartz7 
Chrome Tourmaline7 – 7.5 
Dumortierite Quartz7 – 8.5 
Iolite7 – 7.5 
Rubellite Tourmaline7 – 7.5 
Tanzanite6.5 – 7 
Peridot6.5 – 7 
Mali Garnet6.5 – 7.5 
Jasper6.5 – 7 
Axinite6.5 – 7 
Chrysoprase6.5 – 7 
Fossil Coral6.5 – 7 
Dendritic Agate6.5 – 7 
Spessartite Garnet6.5 – 7.5 
Fire Agate6.5 – 7 
Tiger’s Eye6.5 – 7 
Grossularite Garnet6.5 – 7.5 
Agate Geode6.5 – 7 
Star Rose Quartz6.5 – 7 
Ruby-Zoisite6.5 – 7 
Star Garnet6.5 – 7.5 
Idocrase6.5 
Color-Change Garnet6.5 – 7.5 
Hiddenite6.5 – 7 
Agate6.5 – 7 
Melanite6.5 – 7 
Zircon6.5 – 7.5 
Color-Change Diaspore6.5 – 7 
Bloodstone6.5 – 7 
Hessonite Garnet6.5 – 7.5 
Tiger’s Eye Matrix6.5 – 7 
Cat’s Eye Diaspore6.5 – 7 
Spodumene6.5 – 7 
Tsavorite Garnet6.5 – 7.5 
Almandine Garnet6.5 – 7.5 
Peanut Wood6.5 – 7 
Onyx6.5 – 7 
Carnelian6.5 – 7 
Pyrope Garnet6.5 – 7.5 
Chalcedony6.5 – 7 
Rhodolite Garnet6.5 – 7.5 
Sillimanite Cat’s Eye6.5 – 7.5 
Andesine Labradorite6 – 6.5 
Star Moonstone6 – 6.5 
Prehnite6 – 6.5 
Labradorite6 – 6.5 
Rainbow Moonstone6 – 6.5 
Rainbow Pyrite6 – 6.5 
Sunstone6 – 6.5 
Moonstone6 – 6.5 
Sugilite6 – 6.5 
Clinohumite6 
Maw-Sit-Sit6 – 7 
Cassiterite6 – 7 
Kyanite6 – 7 
Star Sunstone6 – 6.5 
Jadeite6 – 6.5 
Nephrite Jade6 – 6.5 
Orthoclase6 – 6.5 
Amazonite6 – 6.5 
Cat’s Eye Scapolite5.5 – 6 
Moss Opal5.5 – 6.5 
Hematite5.5 – 6.5 
Nuummite5.5 – 6 
Moldavite5.5 
Opal Doublet5.5 – 6.5 
Fire Opal5.5 – 6.5 
Rhodonite5.5 – 6.5 
Scapolite5.5 – 6 
Boulder Opal5.5 – 6.5 
Opal5.5 – 6.5 
Sodalite5.5 – 6 
Hackmanite5.5 – 6 
Sphene5 – 5.5 
Lapis Lazuli5 – 6 
Tremolite-Hexagonite5 – 6 
Hemimorphite5 
Star Diopside5 – 6 
Smithsonite5 
Cat’s Eye Apatite5 
Turquoise5 – 6 
Snowflake Obsidian5 – 5.5 
Apatite5 
Chrome Diopside5 – 6 
Obsidian5 – 5.5 
Tashmarine Diopside5 – 6 
Larimar4.5 – 5 
Gaspeite4.5 – 5 
Charoite4.5 – 5 
Rhodochrosite4 
Variscite4 – 5 
Ammolite4 
Fluorite4 
Azurite3.5 – 4 
Malachite3.5 – 4 
Sphalerite3.5 – 4 
Calcite3 
Coral3 – 4 
Verdite3 
Lepidolite2.5 – 3 
Pearl2.5 – 4.5 
Chrysocolla2 – 4 
Seraphinite2 – 4 
Amber2 – 2.5