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Silicate

Epidote-(Sr)

CaSr(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)
Hardness6.5
Crystal systemMonoclinic
ClassSilicate
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Epidote-(Sr)

Epidote-(Sr) is an IMA-recognized mineral species in the silicate class, with the chemical formula CaSr(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH).

It crystallizes in the monoclinic crystal system (space group P2_1/m). It is a member of the Epidote structural group.

Key properties: Mohs hardness 6.5; specific gravity 3.74; optically biaxial.

IMA symbol Ep-Sr, IMA status: approved, named in 2006.

A late-stage hydrothermal vein mineral in a tinzenite deposit in metachert (Nagakawara deposit) and in piemontite breccias (Hohnomori deposit).

It is found associated with Calcite, tinzenite, piemontite-(Sr).

The name refers to its chemical composition as a member of the epidote group.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more E minerals or help write this entry.