» Mohs Table of Hardness

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Technical Information

» Enhancement Glossary
» Mohs Table of Hardness
» Origin of B. Diamonds

ALPHABETICAL MOHS TABLE OF HARDNESS
Alabaster 2 Garnet 7-7.5 Rhodochrosite 1.5-4.5
Amber 2-2.5 Glass 5-6 Rhodonite 5.5-6.5
Andalusite 7-7.5 Hematite 5.5-6.5 Rutile 6-6.5
Apatite 5 Iolite 7-7.5 Serpentine 2-4
Azurite 3.5-4 Jadeite 6.5-7 Soapstone 1-1.5
Brazilianite 5.5 Jet 2.5-4 Sodalite 5-6
Calcite 3 Lazulite 5-6 Sphene 5-5.5
Chalcedony 6.5-7 Labradorite 6 Spinel 8
Chrysoberyl 8.5 Lapis-Lazuli 5-6 Topaz 8
Coral 3.5-4 Malachite 3.5-4 Tourmaline 7-7.5
Corundum
(Sapphire / Ruby)		 9 Marcasite 6-6.5 Turquoise 5-6
Cubic Zirconia 8.75 Moldavite 5.5 Variscite 4-5
Diamond 10 Nephrite 6-6.5 Zircon (low) 6.5
Diopside 5-6 Obsidian 5-5.5 Zircon (med.) 7.5
Dioptase 5 Opal 5-6.5 Zoisite 6-7
Emerald 7.5-8 Pearl 2.5-4.5    
Epidote 6-7 Peridot 6.5-7    
Fluorite 4 Quartz 7    

Hardness rating for some Metals: 

Silver........2 1/2 - 3
Gold.........2 1/2 - 3
Copper.....2 1/2 - 3
Platinum...4 - 4 1/2
Iron..........4 - 5
 

Hardness rating for some Metals: 

Silver........2 1/2 - 3
Gold.........2 1/2 - 3
Copper.....2 1/2 - 3
Platinum...4 - 4 1/2
Iron..........4 - 5
 


Percent Composition For Emeralds
Element Percent Composition by Mass Percent Composition by Number
Beryllium 5.0% 10.3%
Aluminum 10.1% 6.9%
Silicon 31.3% 20.7%
Oxygen 53.6% 62.1%

This is a model of beryl's structure:

Formula: Be3Al2Si6O18

Crystal: Beryl crystals are usually hexagonal.

Bonding: In the backbone of beryl's structure all the bonds are single bonds.