# Difference between revisions of "Crystal Systems"

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| '''Cubic''' <br> | | '''Cubic''' <br> | ||

The cube is composed of 6 square faces<br> | The cube is composed of 6 square faces<br> | ||

− | at | + | at 90° angles to each other. Each<br> |

face intersects one of the crystallographic<br> | face intersects one of the crystallographic<br> | ||

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

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| '''Hexagonal''' | | '''Hexagonal''' | ||

− | In the hexagonal system we have an additional | + | In the hexagonal system, we have an additional axis,<br> |

− | + | giving the crystals six sides. Three of these<br> | |

are equal in length and meet at 60° to each other. <br> | are equal in length and meet at 60° to each other. <br> | ||

The C or vertical axis is at 90° to the shorter axes.<br> | The C or vertical axis is at 90° to the shorter axes.<br> | ||

Line 62: | Line 62: | ||

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

− | In this system there are three axes | + | 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. | ||

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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> |

## Revision as of 16:41, 10 November 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 axis, |
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 |