Geology Superstore
Geology Superstore

Millstone Grit

Millstone Grit. A coarse grained Carboniferous (Namurian) sandstone from the North of England.

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Milllstone Grit is a fine- to very coarse-grained feldspathic sandstones, interbedded with grey siltstones and mudstones, with subordinate marine shaly mudstone, claystone, coals and seatearths. It is Carboniferous ( Namurian) in age & laid down in estuarine to tidal environments. Millstone Grit forms many prominent features throughout the north of England. It’s well cemented structure has made it an ideal building stone for the characteristic terrace cottages & mills of the area prior to the mass use of bricks. As the name implies, it was the preferred lithology to make millstones. This example was collected near Horwich, Bolton. Specimens are supplied in labelled card trays. it can also be purchased by weight in 1kg bags.

Weight 120 g
Specimen Size

2" x 2", 3" x 2", 4" x 3"

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