Observation #16 by Greg

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Classify image

No rotation: cm pm pg p1
180-degree: pmm cmm pmg pgg p2
120-degree: p4m p4g p4
90-degree: p3m1 p31m p3
60-degree: p6m p6

Classification guidance

Smallest rotation: None 180 degrees 120 degrees 90 degrees 60 degrees
Is there a reflection? Yes No
If there is a glide on an axis that's not a reflection, then this is cm.
Otherwise this is pm.
If there is a glide, then this is pg.
Otherwise this is p1.
If there are reflections in two directions then
  • If all rotation centers are on reflection axes, this is pmm.
  • Otherwise, this is cmm.
Otherwise this is pmg.
If there is a glide then this is pgg. Otherwise this is p2.
If all three-fold centers are on reflection axes, then p3m1. Otherwise p31m.
p3.
If there are reflections in four directions then p4m. Otherwise p4g.
p4.
p6m.
p6.