Gunbad-i Alaviyyan, Hamadan

• The symmetry group of the tiling is *632 (p6m).
• All the internal angles of the constituent polygons are a multiple of 20°.
• Contains one regular three-pointed star polygon with vertex angle of 100°.
• Contains one regular enneagon.
• Contains one regular 6-pointed star polygon with vertex angle of 40°.
• There is one non-regular reflective tile.
• The tiling satisfies the interlace condition and has no finite interlace and one infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 165 polygons.

1. Figs 25, 41 (Barudjiah Madrasah, Sivas, Turkey) of Rudolf M Riefstahl. Primitive Rugs of the 'Konya' Type..., Art Bulletin,13:2, 1931. ISBN . [riefstahl] {}
2. Figure 180 (Gunbad-i Alaviyyan, Hamadan, Iran) of Derek Hill. Islamic architecture and its decoration, A.D. 800-1500..., Faber and Faber, Pressmark 35.C.183, 1964. ISBN 050051032. [hill] {With an introductory text by Oleg Grabar}

• Regular polygons with more than eight sides
• Tilings not constructible by straightedge and compass

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