Saccoite
Saccoite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Ca₂Mn³⁺₂F(OH)₈·0.5(SO₄).
It crystallizes in the tetragonal crystal system (space group P4/ncc).
Key properties: specific gravity 2.73; White to light green streak; Vitreous luster; optically uniaxial.
IMA symbol Sac, IMA status: approved, named in 2019.
Filling voids in hydrothermally altered manganese ore.
It is found associated with Bixbyite, baryte, braunite, gypsum, chlorite, sturmanite, ettringite.
The mineral was named to honor Guido Sacco (1900-1994) and his son Desmond Sacco (b.
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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