ironstone
Noun
Meaning
A hard, earthy ore of iron.
Source: Webster's dictionarySynonyms
Phrases with the word
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Examples
An opal doublet consists of a relatively thin layer of precious opal, backed by a layer of dark-colored material, most commonly ironstone, dark or black common opal (potch), onyx, or obsidian.
It is unclear whether these banded ironstone formations were seasonal, followed some feedback oscillation in the ocean's complex system or followed some other cycle.
Origins An ashtray carved out of a soft form of banded ironstone from the 3.5 billion year old Barbeton Supergroup in South Africa.
The first two are blue fibrous minerals, with glaucophane occurring in blueschists and crocidolite (blue asbestos) in ironstone formations, both resulting from dynamo-metamorphic processes.
When the building burned before this present 1914 William Cass Aldrich structure was built, the children went for a few years to classes in the nearby Ironstone mill which is now demolished.