Hydrodelhayelite
Hydrodelhayelite is an IMA-recognized mineral species in the silicate class, with the chemical formula KCa₂(Si₇Al)O₁₇(OH)₂·6H₂O.
It crystallizes in the orthorhombic crystal system (space group Pnm2_1).
Key properties: Mohs hardness 4; specific gravity 2.168; Vitreous luster.
IMA symbol Hdhy, IMA status: approved, named in 1979.
A secondary alteration product of delhayelite from ijolite-urtite pegmatites in a differentiated alkalic massif.
It is found associated with Delhayelite, lamprophyllite, eudialyte, hisingerite, aegirine, orthoclase.
The name refers to its relation to delhayelite, and the water in its composition.
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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