Black Holm
Encyclopedia
Black Holm is a small tidal island in the Orkney Islands
Orkney Islands
Orkney also known as the Orkney Islands , is an archipelago in northern Scotland, situated north of the coast of Caithness...

, near Copinsay
Copinsay
'Copinsay is one of the Orkney Islands in Scotland, lying off the east coast of the Orkney Mainland. The smaller companion island to Copinsay is called the Horse of Copinsay and lies to the north east to the main island. The island is now uninhabited and managed as a bird reserve...

 to the west of Corn Holm
Corn Holm
Corn Holm is a small tidal island in Orkney, near Copinsay to the west. There was once a small chapel here , and it is covered in birdlife.- Geography and geology :Corn Holm is made up of red sandstone....

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Geography and geology

Corn Holm is made up of red sandstone
Sandstone
Sandstone is a sedimentary rock composed mainly of sand-sized minerals or rock grains.Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth's crust. Like sand, sandstone may be any colour, but the most common colours are tan, brown, yellow,...

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At low tide it is connected to Corn Holm
Corn Holm
Corn Holm is a small tidal island in Orkney, near Copinsay to the west. There was once a small chapel here , and it is covered in birdlife.- Geography and geology :Corn Holm is made up of red sandstone....

which is in turn connected to Copinsay by a stretch called "Isle Rough".
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