# Difference between revisions of "Crystal Systems"

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[[Ruby]] <br> | [[Ruby]] <br> | ||

[[Sapphire]] <br> | [[Sapphire]] <br> | ||

+ | |- | ||

+ | | '''Trigonal'''<br> | ||

+ | |||

+ | Again, the trigonal system is a subsystem of the <br> | ||

+ | hexagonal. Most gem references will list these as<br> | ||

+ | hexagonal. | ||

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

+ | | [[Amethys]]t<br> | ||

+ | [[Corundum]]<br> | ||

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

+ | |- | ||

+ | | '''Orthorhombic'''<br> | ||

+ | |||

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

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

+ | are a different length. | ||

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

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

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

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

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

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

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

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

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

+ | |||

+ | |- | ||

+ | | '''Monoclinic'''<br> | ||

+ | |||

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

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

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

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

+ | one does not | ||

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

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

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

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

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

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

+ | |||

+ | |- | ||

+ | | '''Triclinic'''<br> | ||

+ | |||

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

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

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

+ | |[[Turquoise]] | ||

+ | |||

|} | |} |

## Revision as of 17:04, 1 October 2006

## Crystal Systems & Forms

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 axes, |
Aquamarine Benitoite | |

TrigonalAgain, the 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 |