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An unusual occurrence of quartz and amorphous silica at Carmean, Moneymore, Co. Antrim
Published online by Cambridge University Press: 01 May 2009
Summary
Cavities in Cretaceous chalk, Co. Antrim, contain spongy silica. SEM photographs show minute doubly terminated quartz crystals trapped in fibrous mats of amorphous silica. The absence of both opal diffraction lines and a globular structure indicate the prior existence of gelatinous silica which prevented settling of the suspended quartz crystals. Drying and shrinkage of the gel produced the spongy deposit.
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