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Arsenate

Stergiouite

CaZn₂(AsO₄)₂·4H₂O
Hardness3
Crystal systemMonoclinic
ClassArsenate
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Stergiouite specimen

Stergiouite is a new mineral from the Plaka area in the northern part of the Lavrion Mining District, Greece. — Photo: Bioanapt · CC BY-SA 4.0

Stergiouite

Stergiouite is an IMA-recognized mineral species in the arsenate class, with the chemical formula CaZn₂(AsO₄)₂·4H₂O.

It crystallizes in the monoclinic crystal system (space group Pc). It is a member of the Phosphophyllite structural group.

Key properties: Mohs hardness 3; specific gravity 3.1; White streak; Pearly luster; optically biaxial.

IMA symbol Sgo, IMA status: approved, named in 2019.

Secondary on amorphous films coating the matrix of a galena and sphalerite-bearing vein.

It is found associated with Galena, sphalerite, native arsenic, sulfur, pharmacolite, köttigite, picropharmacolite, hörnesite. Distribution From the Plaka Mine No. 80.

The mineral was named to honor Vasilis Stergiou (b. 1958) for contributions to the mineralogy of the Lavrion deposits.

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 S minerals or help write this entry.