Mimetite: P63/m Space Group Explained

In summary, the conversation discusses the P63/m space group in the general-symmetry-space group table for mimetite. The letter "P" indicates a primitive group and the subscript "3" represents a screw axis along the hexagonal c-axis. The "/m" indicates a mirror plane perpendicular to the c-axis and this space group is #176. The Bilbao crystallographic server is recommended for further details.
  • #1
ZedCar
354
1
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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  • #3
"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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  • #4
Thanks guys!
 

1. What is the P63/m space group in relation to mimetite?

The P63/m space group is a crystallographic symmetry group that describes the arrangement of atoms in mimetite crystals. This space group is also known as the hexagonal crystal system, and it is characterized by a six-fold rotational axis and a mirror plane.

2. How does the P63/m space group affect the physical properties of mimetite?

The P63/m space group plays a crucial role in determining the physical properties of mimetite. It affects the crystal shape, cleavage, and optical properties of the mineral, as well as its ability to form twinned crystals. Additionally, the arrangement of atoms in this space group influences the mineral's hardness, density, and other physical characteristics.

3. What other minerals have the same P63/m space group as mimetite?

Aside from mimetite, other minerals that have the P63/m space group include apatite, calcite, corundum, and quartz. These minerals may have different chemical compositions and physical properties, but they share the same crystal structure due to their common space group.

4. Can the P63/m space group be observed under a microscope?

Yes, the P63/m space group can be observed under a microscope using polarized light. When light passes through a mimetite crystal, it will interact with the atoms in a specific way, producing a unique interference pattern that can be used to identify the crystal's space group.

5. How is the P63/m space group determined for mimetite?

The P63/m space group for mimetite is determined through a process called X-ray crystallography. This method involves bombarding a crystal with X-rays and measuring the resulting diffraction pattern. The data collected from this process is then analyzed to determine the crystal's symmetry elements, which ultimately lead to the identification of the space group.

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