Mimetite: P63/m Space Group Explained

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Discussion Overview

The discussion revolves around the P63/m space group in crystallography, specifically focusing on the meanings of its components as described in the Hermann-Mauguin notation. Participants explore the definitions and implications of the letters and numbers in the space group designation.

Discussion Character

  • Technical explanation

Main Points Raised

  • One participant asks about the meaning of the letter "P" and the subscript "3" in the space group P63/m.
  • Another participant explains that "P" indicates a primitive group, while "6" signifies a hexagonal space group.
  • The subscript "3" is described as indicating a screw axis along the hexagonal c-axis.
  • Additionally, "/m" is noted to represent a mirror plane perpendicular to the c-axis.
  • It is mentioned that this space group is identified as space group #176.
  • A resource, the Bilbao crystallographic server, is suggested for further details on space groups.

Areas of Agreement / Disagreement

Participants appear to agree on the meanings of the components of the space group P63/m, with no evident disagreement in the explanations provided.

Contextual Notes

None.

Who May Find This Useful

Individuals interested in crystallography, particularly those studying space groups and their notation.

ZedCar
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In the general-symmetry-space group table over to the right on the page below:
https://en.wikipedia.org/wiki/Mimetite

It states:

Space group: P63/m

What does the letter P indicate and also the subscript 3?

Thanks
 
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"6" indicates a hexagonal space group

"P" indicates a primitive group (as compared to face or body centered ones). All hexagonal space groups are primitive.

"_3" indicates a screw axis along the hexagonal c-axis

"/m" indicates a mirror plane perpendicular to the c-axis.

This is space group #176

The Bilbao crystallographic server can provide all kinds of details.

http://www.cryst.ehu.es/
 
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Thanks guys!
 

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