Cianciulliite
Cianciulliite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Mg₂Mn²⁺Zn₂(OH)₁₀·2-4H₂O.
It crystallizes in the monoclinic crystal system (space group C2/m).
Key properties: Mohs hardness 2; specific gravity 2.87; Adamantine to vitreous; dull to pearly on cleavage luster.
IMA symbol Cia, IMA status: approved, named in 1990.
A very rare mineral on a museum specimen, typical of material from secondary veins in a metamorphosed stratiform zinc orebody.
It is found associated with Willemite, zincite, cahnite.
In honor of John Cianciulli, of Sussex, New Jersey, USA, for his assistance to mineralogists studying Franklin-Sterling Hill 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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