Gowhar Shad mosque, Mashhad

• The symmetry group of the tiling is 2*22 (cmm).
• All the internal angles of the constituent polygons are a multiple of 18°.
• Contains 94 regular two-pointed star polygons with vertex angle of 72°.
• Contains 7 regular pentagons.
• Contains one regular 10-pointed star polygon with vertex angle of 108°.
• There are 7 non-regular reflective tiles.
• The tiling satisfies the interlace condition and has 8 finite interlaces and one infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 1607 polygons.

1. Vol 5, page 73 (Gowhar Shad mosque, Mashhad, Iran) of Mahmood Maher al-Naqsh. Design and execution of drawing in Iranian tilework, Islamic period, Reza Abbasi Museum, 1983. [iran] {Good collection of Iranian patterns, text in Persian} Available on Internet.(1418AD, 821AH)
2. Fig 11.10b of Brian Wichmann and David Wade. Islamic Design: a Mathematical Approach, Springer, 2017. ISBN 978-3-319-69. [ww] {}

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