Stoppaniite
Stoppaniite is an IMA-recognized mineral species in the silicate class, with the chemical formula Fe³⁺₂Be₃Si₆O₁₈·H₂O.
It crystallizes in the hexagonal crystal system (space group P6/mcc). It is a member of the Beryl structural group.
Key properties: specific gravity 2.79; White streak; Vitreous luster; optically uniaxial.
IMA symbol Spp, IMA status: approved, named in 1996.
Found in miarolitic cavities in syenitic volcanic ejecta.
It is found associated with Biotite, quartz, sanidine, hematite, danburite, helvite, hellandite, allanite-(Ce).
The mineral was named to honor Dr. Francesco Saverio Stoppani (b. 1947), an amateur mineral collector active in the volcanic regions of Latium.
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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