[T] It is an island, but [CdM] not Lindisfarne, because [R] it is indeed St Michael's Mount. Have this perspex replica of the Great Pyramid with St Michael's Mount inside.

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This one is strictly speaking ABSTRACT but with strong MINERALconnections.

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Sorry for the delay. Distracted by thunderstorms and general torpor.
(CdM) Not sea-level
(Tuj) Despite the above remark, NO
(Bis) NOT Radio Caroline
(SM) NOT Al futures
(Tuj) NOT fictional but maybe uncommon.
(Raak) NOT scientific
(CdM) Mineral connection NOT liquid.