# Difference between revisions of "Crystal Systems"

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axes and is parallel to the other two.<br> | axes and is parallel to the other two.<br> | ||

| [[image:xl_cubic.gif|left|]] | | [[image:xl_cubic.gif|left|]] | ||

− | | [[Diamond]] <br> | + | |[[Diamond]] <br /> |

− | [[Garnet]] <br> | + | [[Garnet]] <br /> |

[[Spinel]] | [[Spinel]] | ||

|- | |- | ||

− | | '''Tetragonal''' <br> | + | | '''Tetragonal''' <br /> |

The tetragonal system also has three axes<br> | The tetragonal system also has three axes<br> | ||

Line 35: | Line 35: | ||

appearance (see following). | appearance (see following). | ||

|[[image:xl_hexagonal.gif|left|]] | |[[image:xl_hexagonal.gif|left|]] | ||

− | |[[Aquamarine]]<br> | + | |[[Aquamarine]]<br /> |

− | [[Benitoite]]<br> | + | [[Benitoite]]<br /> |

− | [[Beryl]] <br | + | [[Beryl]] <br /> |

− | + | [[Emerald]]<br /> | |

− | [[Emerald]]<br> | + | [[Heliodor]]<br /> |

− | [[Heliodor]]<br> | + | [[Morganite]]<br /> |

− | [[Morganite]]<br | ||

− | |||

− | |||

− | |||

|- | |- | ||

− | | '''Trigonal'''<br> | + | | '''Trigonal'''<br /> |

The trigonal system is a subsystem of the <br /> | The trigonal system is a subsystem of the <br /> | ||

hexagonal system according to some institutes,<br /> | hexagonal system according to some institutes,<br /> | ||

− | therefore some gem references will list these as<br> | + | therefore some gem references will list these as<br /> |

hexagonal. | hexagonal. | ||

| [[image:xl_trigonal1.gif|left|]] | | [[image:xl_trigonal1.gif|left|]] | ||

− | | [[Amethyst]]<br> | + | | [[Amethyst]]<br /> |

− | [[Corundum]]<br> | + | [[Citrine]]<br /> |

− | [[Tourmaline]] <br> | + | [[Corundum]]<br /> |

+ | [[Quartz]] <br /> | ||

+ | [[Ruby]] <br /> | ||

+ | [[Sapphire]] <br /> | ||

+ | [[Tourmaline]] <br /> | ||

+ | |||

|- | |- | ||

− | | '''Orthorhombic'''<br> | + | | '''Orthorhombic'''<br /> |

− | In this system, there are three axes all of which<br> | + | In this system, there are three axes all of which<br /> |

− | meet at 90° to each other. However, all the axes<br> | + | meet at 90° to each other. However, all the axes<br /> |

are a different length. | are a different length. | ||

| [[image:xl_orthorhombic.gif|left|]] | | [[image:xl_orthorhombic.gif|left|]] | ||

− | |[[Alexandrite]]<br> | + | |[[Alexandrite]]<br /> |

− | [[Andalusite]]<br> | + | [[Andalusite]]<br /> |

− | [[Chrysoberyl]]<br> | + | [[Chrysoberyl]]<br /> |

− | [[Iolite]]<br> | + | [[Iolite]]<br /> |

− | [[Peridot]]<br> | + | [[Peridot]]<br /> |

− | [[Tanzanite]] <br> | + | [[Tanzanite]] <br /> |

− | [[Topaz]]<br> | + | [[Topaz]]<br /> |

− | [[Varisite]]<br> | + | [[Varisite]]<br /> |

|- | |- | ||

− | | '''Monoclinic'''<br> | + | | '''Monoclinic'''<br /> |

− | The above crystal systems all have axes sides<br> | + | The above crystal systems all have axes sides<br /> |

− | that meet at 90°. In the monoclinic system, all<br> | + | that meet at 90°. In the monoclinic system, all<br /> |

− | the axes are different lengths. Two of them, <br> | + | the axes are different lengths. Two of them, <br /> |

− | the A and C axes, meet at 90°, but the third <br> | + | the A and C axes, meet at 90°, but the third <br /> |

one does not. | one does not. | ||

| [[image:xl_monoclinic.gif|left|]] | | [[image:xl_monoclinic.gif|left|]] | ||

− | |[[Azurite]]<br> | + | |[[Azurite]]<br /> |

− | [[Diopside]] <br> | + | [[Diopside]] <br /> |

− | [[Feldspar]]<br> | + | [[Feldspar]]<br /> |

− | [[Kunzite]] <br> | + | [[Kunzite]] <br /> |

− | [[Nephrite]] <br> | + | [[Nephrite]] <br /> |

|- | |- | ||

− | | '''Triclinic'''<br> | + | | '''Triclinic'''<br /> |

− | In this system all the axes are different <br> | + | In this system all the axes are different <br /> |

lengths and none of them meet at 90°. | lengths and none of them meet at 90°. | ||

| [[image:xl_triclinic.gif|left|]] | | [[image:xl_triclinic.gif|left|]] |

## Revision as of 13:46, 4 December 2006

Crystal System | Diagram | Examples |
---|---|---|

Cubic The cube is composed of 6 square faces |
Diamond | |

Tetragonal The tetragonal system also has three axes |
Zircon | |

Hexagonal
In the hexagonal system, we have an additional axis, |
Aquamarine | |

TrigonalThe trigonal system is a subsystem of the |
Amethyst | |

OrthorhombicIn this system, there are three axes all of which |
Alexandrite Andalusite | |

MonoclinicThe above crystal systems all have axes sides |
Azurite | |

TriclinicIn this system all the axes are different |
Turquoise |