What is Mohs hardness?

Mohs hardness is used to indicate the measurement of the ore hardness, is divided into 10, the hardest natural ore is diamond i.e. diamond, and then by the scratch method to determine the hardness of other minerals, diamond needle scribing the test surface of the mineral and scratches, customary mineralogical or gemological are with Mohs hardness.
  
In the ore processing, there frequently encountered ores Mohs hardness problem, SHANGHAI CLIRIK summarizes the common ore Mohs hardness comparison table for your reference.
 

Talc - 1.00                                       Aluminium - 1.50                                  Ice - 1.50
Lead - 1.50                                      Tin - 1.50-2.00                                    Gypsum - 2.00
Selenite - 2.00                                 Stibnite - 2.00                                     Sulfur - 2.00
Zinc - 2.00                                       Amber - 2.00+                                     Cinnabar - 2.00-2.50
Chlorite - 2.00-3.00                         Fuchsite - 2.00-3.00                            Chrysocolla - 2.00-4.00
Lepidolite - 2.50                              Galena - 2.50+                                    Calcite - 2.50-3.00
Copper - 2.50-3.00                         Gold - 2.50-3.00                                  Crocoite - 2.50-3.00
Silver - 2.50-3.00                           Jet - 2.50-4.00                                      Barite - 3.00-3.50                         
Celestite - 3.00-3.50                      Serpentine - 3.00-4.50                         Ajoite - 3.50
Angelite - 3.50                               Coral - 3.50                                           Howlite - 3.50
Aragonite - 3.50-4.00                    Azurite - 3.50-4.00                                 Pearl - 3.50-4.00
Malachite - 5.30-4.00                    Rhodochrosite - 3.50-4.00                     Fluorite - 4.00
Titanium - 4.00                             Platinum - 4.00-4.50                               Smithsonite - 4.00-4.50
Iron - 4.50                                    Apophyllite - 4.50-5.00                             Kyanite - 4.50-6.50             
Apatite - 5.00                               Charoite - 5.00                                         Hemimorphite - 5.00
Lapis Lazuli - 5.00-5.50                Obsidian - 5.00-5.50                                Hematite - 5.00-6.00
Moldavite - 5.00-6.00                   Tektite - 5.00-6.00                                  Tiger Eye - 5.00-6.00
Actinolite - 5.50-6.00                    Nephrite - 5.50-6.00                                Opal - 5.50-6.00
Sodalite - 5.50-6.00                     Turquoise - 5.00-6.00                              Magnetite - 5.50-6.50
Rhodonite - 5.50-6.00                  Amazonite - 6.00-6.50                             Labradorite - 6.00-6.50
Moonstone - 6.00-6.50                 Prehnite - 6.00-6.50                                Pyrite - 6.00-6.50
Rutile - 6.00-6.50                         Sugilite - 6.00-6.50                                   Sunstone - 6.00-6.50
Hiddenite - 6.50                           Jadeite - 6.50                                             Garnet - 6.50-7.50
Jade - 6.50-7.00                          Jasper - 6.50-7.00                                      Kunzite - 6.50-7.00
Olivine - 6.50-7.00                       Peridot - 6.50-7.00                                   Agate - 7.00  Amethyst - 7.00
Ametrine - 7.00                            Aventurine - 7.00                                      Bloodstone - 7.00
Carnelian - 7.00                          Chalcedony - 7.00                                     Citrine - 7.00
Onyx - 7.00                                  Quartz - 7.00                                             Rose quartz - 7.00
Silicon - 7.00                                Smoky quartz - 7.00                                  Danburite - 7.00-7.50
Iolite - 7.00-7.50                           Schorl - 7.00-7.50                                     Tourmaline - 7.50
Zircon - 7.50                                Aquamarine - 7.50-8.00                              Beryl - 7.50-8.00
Emerald - 7.50-8.00                    Topaz - 8.00                                                Alexandrite - 8.50
Corundum - 9.00                          Ruby - 9.00                                                 Sapphire - 9.00
Diamond - 10.00