Mosque of Qijmas Al-Ishaqi, Cairo, Egypt

See the related pattern Bourgoin, Plate 136.

• The symmetry group of the tiling is *632 (p6m).
• All the internal angles of the constituent polygons are a multiple of 2.5°.
• Contains one regular 9-pointed star polygon with vertex angle of 40°.
• Contains one regular 18-pointed star polygon with vertex angle of 60°.
• There are 6 non-regular reflective tiles (including one kite) and two reflective pairs.
• The tiling satisfies the interlace condition and has two finite interlaces and no infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 340 polygons.

1. Photo by Wael Elsafty (Amir Qijmas al-Ishaqi, Cairo, Egypt. Minbar) of Not specific. Personal Communication, Information sent to the author, 21c. [pc]

• Tilings not constructible by straightedge and compass

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