Everything about Ironstone totally explained
Ironstone is a fine-grained, heavy and compact
sedimentary rock. Its main components are the carbonate or oxide of
iron,
clay and/or
sand. It can be thought as a concretionary form of
siderite. Ironstone also contains clay, and sometimes
calcite and
quartz.
Appearance
Freshly cleaved ironstone is usually gray. The brown external appearance is due to
oxidation of its surface.
Ironstone, being a sedimentary rock isn't always homogeneous, and can be found in a red and black banded form called
tiger iron, sometimes used for
jewelry purposes.
Sometimes ironstone hosts
concretions or
opal gems.
Occurrence
Ironstone mostly occurs in the form of nodules, for example in seams in the
coal measures.
Uses
Due to its unique properties, ironstone was once popular for use in
English tea sets
Ironstone as a source of iron
Ironstone is a bountiful and widespread source of
iron (Fe), although it only contains less than 50 percent iron, far less than the other main source of iron,
hematite. Historically, most of British iron originated from ironstone, but it's now rarely used for this purpose.
Further Information
Get more info on 'Ironstone'.
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