Hydroxylgugiaite
Hydroxylgugiaite is an IMA-recognized mineral species in the silicate class, with the chemical formula (Ca₃ )Σ₄(Si₃.₅Be₂.₅)Σ₆O₁₁(OH)₃.
It crystallizes in the tetragonal crystal system (space group P-42_1m). It is a member of the Melilite structural group.
Key properties: Mohs hardness 5; specific gravity 2.79; White streak; Vitreous luster; optically uniaxial.
IMA symbol Hgug, IMA status: approved, named in 2016.
A replacement of Be silicate minerals in hydrothermally-altered syenite pegmatite.
It is found associated with Microcline, albite, biotite, zircon, pyrochlore, fayalite, magnetite, ferrochiavennite, gadolinite-(Ce), aegirine, analcime, pyrophanite, nepheline, calcite.
As the hydroxyl-bearing analog of gugiaite.
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 H minerals or help write this entry.