Webster's Online Dictionary
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Date "HEDENBERGITE" was first used in popular English literature: sometime before 1828. (references)

Specialty Definition: HEDENBERGITE

DomainDefinition
Noah Webster [Noun] A mineral, or ore of iron, in masses, composed of shining plates, which break into rhombic fragments; found at Tunaberg, in Sweden.. Source: Webster's 1828 American Dictionary.
MiningA monoclinic mineral, 4[CaFeSi2 O6 ] ; pyroxene group; forms series with diopside and johannsenite; a common rock-forming mineral in iron-rich metamorphic rocks, limestone skarns, and fayalite-bearingplutonic rocks. (references)
WikipedicHedenbergite, or calcium iron pyroxene, is a black mineral closely allied to diopside and, owing to the isomorphous replacement of iron by magnesium, there is no sharp line of division between them. (references)

Source: compiled by the editor from various references; see credits.

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