Scacchite
Scacchite is an IMA-recognized mineral species in the halide class, with the chemical formula MnCl₂.
It crystallizes in the hexagonal crystal system (space group R-3m). It is a member of the Scacchite structural group.
Key properties: specific gravity 2.98; optically uniaxial.
IMA symbol Sca, grandfathered status — known before the IMA’s founding, named in 1855.
A product of fumarolic activity.
It is found associated with Halite, sylvite, other chlorides.
The mineral was named to honor Professor Arcangelo Scacchi (1810–1893), Italian mineralogist, University of Naples, Naples, Italy.
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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