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ironstone

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cambering

Overview page. Subjects: Earth Sciences and Geography — Ecology and Conservation.

The consistent dip of strata towards valley centres, in conflict with the general regional dip. It is well displayed in the English Midlands, where ironstone beds above clays are cambered...

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meteorite

Overview page. Subjects: Astronomy and Astrophysics.

An extraterrestrial mass which has reached the Earth from outer space, without burning up in the atmosphere. See also meteor.

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riebeckite

Overview page. Subjects: Earth Sciences and Geography.

A member of the alkali amphiboles Na2(Fe2+ 3Fe3+ 2)[Si4O11]2(OH,F)2 and end-member of an isomorphous series with glaucophane Na2(Mg3Al2)[Si4O11]2(OH,F)2; sp. gr....

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septarian nodule

Overview page. Subjects: Earth Sciences and Geography.

A concretion, roughly spheroidal in shape, usually of clay ironstone, and characterized by an internal structure of angular blocks separated by radiating mineral-filled blocks. The mineral...

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siderite

Overview page. Subjects: Earth Sciences and Geography.

Mineral, FeCO3; sp. gr. 3.8–4.0; hardness 3.5–4.5; trigonal; grey to grey-brown or yellowish-brown, translucent when pure; white streak; vitreous lustre; uneven fracture; crystals...

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syngenetic ore

Overview page. Subjects: Earth Sciences and Geography.

An ore deposit formed simultaneously with the host rock and by similar processes, e.g. bedded ironstone, magmatic segregation deposits.

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