Chlorellestadite
Chlorellestadite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₅(SiO₄)₁.₅(SO₄)₁.₅Cl.
It crystallizes in the hexagonal crystal system (space group P6_3/m). It is a member of the Apatite structural group.
Key properties: Mohs hardness 4–4.5; specific gravity 3.091; White streak; Vitreous luster; optically uniaxial.
IMA symbol Clel, IMA status: approved, named in 2017.
The product of pyrometamorphism and metasomatic alteration under sanidinite facies (larnite sub-facies) of a calcium-silicate xenolith in rhyodacite lava.
It is found associated with Spurrite, larnite, chlormayenite, rondorfite, srebrodolskite, jasmundite, oldhamite.
Signifies the chlorine-end member of the ellestadite 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 C minerals or help write this entry.