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Scacchite

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Arcangelo Scacchi
Formula:
MnCl2
System:
Trigonal
Colour:
Colourless, rose-red, ...
Name:
Named by Gilbert-Joseph Adam in 1869 in honor of Arcangelo Scacchi [February 8. 1810 Gravina, Puglia, Italia – October 11, 1893 Napoli, Italia] Professor of Mineralogy, University of Naples, Italy. Scacchi was a systematic mineralogist and is noted for his studies on Mount Vesuvius - Monte Somma near Naples (Napoli), Italy.
Isostructural with:

Classification of Scacchite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
3.AB.20

3 : HALIDES
A : Simple halides, without H2O
B : M:X = 1:2
9.2.3.2

9 : NORMAL HALIDES
2 : AX2
8.10.1

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
10 : Halides of Mn
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http://www.mindat.org/min-3549.html
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First Recorded Occurrence of Scacchite

Year of Discovery:
1869

Physical Properties of Scacchite

Diaphaneity (Transparency):
Transparent
Colour:
Colourless, rose-red, darkening to brown or red-brown
Cleavage:
Perfect
O {0001} ?
Density:
2.98 g/cm3 (Measured)    3.04 g/cm3 (Calculated)

Crystallography of Scacchite

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3m
Cell Parameters:
a = 3.7Å, c = 17.56Å
Ratio:
a:c = 1 : 4.746
Unit Cell Volume:
V 208.19 ų (Calculated from Unit Cell)

Optical Data of Scacchite

Type:
Uniaxial (-)
RI values:
nω = 1.708 nε = 1.622
Max Birefringence:
δ = 0.086
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Scacchite

Formula:
MnCl2
Essential elements:
All elements listed in formula:

Relationship of Scacchite to other Species

Other Members of Group:
3.AB.FluorocronitePbF2
3.AB.05TolbachiteCuCl2
3.AB.10CocciniteHgI2
3.AB.15SellaiteMgF2
3.AB.20ChloromagnesiteMgCl2
3.AB.20Lawrencite(Fe2+,Ni)Cl2
3.AB.25FluoriteCaF2
3.AB.25FrankdicksoniteBaF2
3.AB.25StrontiofluoriteSrF2
3.AB.30Tveitite-(Y)(Y, Na)6Ca6Ca6F42
3.AB.35Gagarinite-(Y)NaCaYF6
3.AB.35Gagarinite-(Ce)Na(REExCa1-x)(REEyCa1-y)F6
3.AB.35Polezhaevaite-(Ce)NaSrCeF6

Other Names for Scacchite

Name in Other Languages:

Other Information

Other Information:
Deliquescent. Readily soluble in water.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Scacchite

Reference List:
Scacchi (1855) Mem. Incend. Vesuv.: 181 (as protochloruro di Manganese).

Adam (1869) Tableau minéralogique, Paris: 70.

Ferrari, Celeri, and Giorgio (1929) Reale accademia nazionale dei Lincei, Rome, Rend.: 9: 782.

Pauling (1929) Proceedings of the National Academy of Science, Washington: 15: 709.

Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 40-41.

Acta Crystallographica: 16: 846-847.

Zeitschrift für Kristallographie (1990): 192: 147-148.

Internet Links for Scacchite

Localities for Scacchite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Italy
 
  • Campania
    • Naples Province
      • Somma-Vesuvius Complex
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 41.
Mineral and/or Locality  
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