Question

This sedimentary rock is used to
make cement and steel in the iron
and steel industry:
(a)
Mudstone
(b)
Sandstone
Limestone
Gypsum​

Answer 1

Explanation:

Claystone Ironstones

Claystone or clayband ironstones have been the basis of the steel industry in many industrialized countries, largely because of their association with coalfields. Essentially, they are accumulations of iron carbonates (usually siderite) that have replaced the non-marine shales of coal-measure cyclothems (parasequences) and occur as either thin sheets or, more commonly, layers of concretions (Figure 4). Occasionally these sheets may extend over several hundred square kilometres. Normally, each concretion is unlaminated and does not contain high amounts of organic material, and the siderite grains are usually microscopic or sub-microscopic in size (less than 10 μm). Marine claystone ironstones are predominately rich in ankerite with pyrite, and production of siderite is suppressed. Irregularly shaped sphaerosiderites (ball ironstones), which usually occur at the base of palaeosols, are composed of siderite cement in the form of distributed spherulites (0.5–1 mm in diameter).

Answer 2

Answer:

b)sandstone

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