Ferruccite (white) on Avogadrite (yellow-brownish), picture size: 5 mm Locality: Vesuvius, Italy — Photo: Thomas Witzke · CC BY-SA 3.0 de
Ferruccite
Ferruccite is an IMA-recognized mineral species in the halide class, with the chemical formula NaBF₄.
It crystallizes in the orthorhombic crystal system (space group Cmcm).
Key properties: Mohs hardness 3; specific gravity 2.496; optically biaxial.
IMA symbol Fru, grandfathered status — known before the IMA’s founding, named in 1933.
Found as a fumarolic sublimate.
It is found associated with Sassolite, fluorborates, and fluorsilicates.
The mineral was named to honor Professor Ferruccio Zambonini (1880–1932), Italian mineralogist, student of fumarolic minerals.
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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