Ferromerrillite
Ferromerrillite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Ca₉NaFe²⁺(PO₄)₇.
It is a member of the Cerite structural group.
Key properties: Mohs hardness 5; specific gravity 3.14; Vitreous luster; optically uniaxial.
IMA symbol Fmer, IMA status: approved, named in 2006.
An accessory phase in the basaltic and olivine-phyric subgroups of shergottite meteorites.
It is found associated with Clinopyroxene, maskelynite (impact-melted plagioclase glass).
The Fe2+-dominant analogue of merrillite.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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