| 11. | The apse is heptagonal and has in its lower half seven pointed arches filled with opus sectile.
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| 12. | For example, gold is sectile but pyrite ( " fool's gold " ) is not.
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| 13. | As such, these eleven mosaics cover virtually the whole period of opus sectile work by Powell's.
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| 14. | Similarly, for works that use larger pieces of stone ( or tile ), opus sectile may be used.
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| 15. | From 1937 until 1947, O'Brien worked on 22 opus sectile panels for the Protestant Church in Ennis.
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| 16. | sectile and has a shining streak; hardness 2.5, specific gravity is 7.2 7.4.
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| 17. | "' Pharmacosiderite "'is a hydrated vitreous and resinous, and it has conchoidal, brittle and sectile fracture.
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| 18. | There is a decorated floor mosaic laid in the technique of " opus sectile " within the basilica and several rooms have been unearthed.
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| 19. | "On the morning of Monday 9th March 2009, there will be a formal unveiling of the restored opus sectile in Long Tower.
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| 20. | The central part of the mosaic is composed of geometric alternating square panels with each side measuring and realized in the opus sectile technique.
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