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Scacchite

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Arcangelo Scacchi
Formula:
MnCl2
Colour:
Colourless, rose-red, darkening to brown or red-brown
Specific Gravity:
2.98
Crystal System:
Trigonal
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:
Hide all sections | Show all sections

Classification of ScacchiteHide

Approved, 'Grandfathered' (first described prior to 1959)
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

Physical Properties of ScacchiteHide

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)

Optical Data of ScacchiteHide

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 ScacchiteHide

Formula:
MnCl2

Crystallography of ScacchiteHide

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

Type Occurrence of ScacchiteHide

Synonyms of ScacchiteHide

Other Language Names for ScacchiteHide

Relationship of Scacchite to other SpeciesHide

Other Members of this group:
ChloromagnesiteMgCl2Hex.
Lawrencite(Fe2+,Ni)Cl2Trig. 3m (3 2/m) : R3m
TolbachiteCuCl2Mon.

Related Minerals - Nickel-Strunz GroupingHide

3.AB.FluorocronitePbF2Iso. m3m (4/m 3 2/m) : Fm3m
3.AB.05TolbachiteCuCl2Mon.
3.AB.10CocciniteHgI2Tet.
3.AB.15SellaiteMgF2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
3.AB.20ChloromagnesiteMgCl2Hex.
3.AB.20Lawrencite(Fe2+,Ni)Cl2Trig. 3m (3 2/m) : R3m
3.AB.25FluoriteCaF2Iso. m3m (4/m 3 2/m) : Fm3m
3.AB.25FrankdicksoniteBaF2Iso. m3m (4/m 3 2/m) : Fm3m
3.AB.25StrontiofluoriteSrF2Iso. m3m (4/m 3 2/m) : Fm3m
3.AB.30Tveitite-(Y)(Y, Na)6Ca6Ca6F42Trig. 3 : R3
3.AB.35Gagarinite-(Y)NaCaYF6Hex. 6/m : P63/m
3.AB.35Gagarinite-(Ce)Na(REExCa1-x)(REEyCa1-y)F6Trig.
3.AB.35Polezhaevaite-(Ce)NaSrCeF6Hex. 6/m : P63/m

Related Minerals - Dana Grouping (8th Ed.)Hide

9.2.3.1Lawrencite(Fe2+,Ni)Cl2Trig. 3m (3 2/m) : R3m
9.2.3.3ChloromagnesiteMgCl2Hex.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.10.2KempiteMn2+2(OH)3ClOrth. mmm (2/m 2/m 2/m) : Pnma
8.10.3ChlormanganokaliteK4[MnCl6]Trig.

Other InformationHide

Notes:
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 ScacchiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 ScacchiteHide

Localities for ScacchiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy (TL)
 
  • 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.
Poland
 
  • Upper Silesia (Śląskie)
    • Upper Silesian Coal Basin
      • Rybnik Coal Area
        • Radlin
Łukasz Kruszewski (2012) Unique chloride assemblage of exhalative origin from burning coal-mining dump in Radlin (Rybnik Coal Area, S Poland). Mineralogical Society of Poland Special Papers 40
Mineral and/or Locality  
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