Gowhar Shad mosque, Mashhad

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 7.5°.
• Contains one regular four-pointed star polygon with vertex angle of 60°.
• Contains one regular 8-pointed star polygon with vertex angle of 90°.
• There are two non-regular reflective tiles (including one kite).
• The tiling satisfies the two-colour condition.
• The tiling is edge-to-edge.
• As drawn, contains about 188 polygons.

1. Page 287, Fig 173c (Firdaws madrasah, Aleppo, Syria) of Jay Bonner. Islamic Geometric Patterns, Springer, 2016. ISBN 978144190216. [bonner] {Largest Islamic tile collection in print}(1235-6AD, 632-3AH)
2. Page 221 (Gowhar Shad mosque, Mashhad, Iran. From a column by the shrine of Imam Reza) of Javad Shafai. On decoration in Persian architecture and wood carving, Tehran, 1977. [shafai] {In Persian}(1418AD, 821AH)

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