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Opal claystone occurs in bedded deposits associated with phosphate rock in the Sirhan-Turayf region of northern Saudi Arabia, A typical sample comprises opal-C (cristobalite) and attapulgite with minor quartz, calcite, and halite. The halite and calcite may be secondary deposits from surface water. Diatom fragments and siliceous sponge spicules suggest that the beds are diagenetically altered diatomite. Deposition may have been on a continental shelf, possibly as an offshore fades of phosphate deposits. Opal-C and attapulgite are co-products of the diagenisis of the diatoms and a clay, possibly montmorillinite.

Opal claystone associated with phosphate rock in northern Saudi Arabia