Hedenbergite

Hedenbergite is a calcium iron silicate mineral in the clinopyroxene group, with the formula CaFeSi₂O₆. It forms a solid-solution series with diopside as iron and magnesium proportions vary.

Clinopyroxene: Clinopyroxene is a group of single-chain silicate minerals with a monoclinic crystal structure. Hedenbergite belongs to this group, whose structure accommodates its calcium, iron, and silicon.
Solid solution: A solid solution is a crystalline phase in which elements substitute for one another within a shared structure. Iron and magnesium can exchange in pyroxene structures without changing the basic mineral framework.
Skarn: Skarn is a rock composed largely of calcium-bearing silicate minerals formed by fluid-driven reactions near igneous intrusions. Hedenbergite commonly occurs in iron-rich skarns formed by reactions between fluids and carbonate rocks.
Augite: Augite is a common calcium-bearing clinopyroxene with variable magnesium, iron, and aluminum. Unlike ideal hedenbergite, augite has a broader and more compositionally complex range.
Iron skarn: Iron skarn is a metasomatic rock enriched in iron and composed of calcium silicates and iron oxides. Hedenbergite is a characteristic silicate in many iron-rich skarn assemblages.
Pyroxene: Pyroxenes are rock-forming inosilicate minerals built from chains of linked silica tetrahedra. The broader mineral family supplies the chain structure shared by clinopyroxenes.
Diopside–hedenbergite series: The diopside–hedenbergite series comprises clinopyroxenes varying continuously between magnesium-rich and iron-rich compositions. This series describes the principal compositional relationship of hedenbergite.
Contact metamorphism: Contact metamorphism is mineral and textural change caused by heat and fluids from nearby magma. Hedenbergite can record high-temperature reactions in rocks altered around intrusions.
Aegirine: Aegirine is a sodium iron clinopyroxene with the formula NaFeSi₂O₆. Its sodium-rich composition contrasts with hedenbergite’s calcium-dominant chemistry.
Carbonate rock: Carbonate rock is sedimentary rock composed mainly of carbonate minerals such as calcite or dolomite. Carbonate protoliths supply calcium for hedenbergite during fluid-driven skarn formation.

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FayaliteCompared with: Unlike fayalite, it is a chain silicate containing calcium.