Chessexite
Chessexite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₄Ca₂Mg₃Al₈(SiO₄)₂(SO₄)₁₀(OH)₁₀·40H₂O.
It crystallizes in the orthorhombic crystal system.
Key properties: specific gravity 2.21; Silky luster; optically biaxial.
IMA symbol Cex, IMA status: approved, named in 1981.
Found as a coating on fluorite.
It is found associated with Fluorite, gypsum.
The name refers to Professor Ronald Chessex, petrographer, University of Geneva, Geneva, Switzerland.
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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