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Scacchite

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Mt. Vesuvius, Somma-Vesuvius Complex, Naples Province, Campania, Italy
© 2008, J. Weissman

Formula:
MnCl
 
2
System:TrigonalColour:Colourless, rose-red, ...
Name:Named after Arcangelo Scacchi (1810- 1893) Professor of Mineralogy, University of Naples, Italy.
Isostructural with:Chloromagnesite, Lawrencite


Lawrencite Group.

Classification of Scacchite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:3/A.07-20
Nickel-Strunz 10th (pending) edition ID:3.AB.20

3 : HALIDES
A : Simple halides, without H2O
B : M:X = 1:2
Dana 8th edition ID:9.2.3.2

9 : NORMAL HALIDES
2 : AX2
Hey's CIM Ref.:8.10.1

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
10 : Halides of Mn
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Type Occurrence of Scacchite

Type Locality:Mt. Vesuvius, Somma-Vesuvius Complex, Naples Province, Campania, Italy
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 (measured):2.98 g/cm3
Density (calculated):3.04 g/cm3

Crystallography of Scacchite

Crystal System:Trigonal
Class (H-M):3m (3 2/m) - Hexagonal Scalenohedral
Space Group:R3m (R3 2/m)
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
Maximum Birefringence:δ = 0.086

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Scacchite

Formula:
MnCl
 
2
Essential elements:Cl, Mn
All elements listed in formula:Cl, Mn

Relationship of Scacchite to other Species

Related to:
  • Lawrencite Group
    • Related Minerals - Nickel-Strunz Grouping):
    3.AB.05Tolbachite
    CuCl
     
    2
    3.AB.10Coccinite
    HgI
     
    2
    3.AB.15Sellaite
    MgF
     
    2
    3.AB.20Chloromagnesite
    MgCl
     
    2
    3.AB.20Lawrencite
    (Fe
    2+
     
    		,Ni)Cl
     
    2
    3.AB.25Fluorite
    CaF
     
    2
    3.AB.25Frankdicksonite
    BaF
     
    2
    3.AB.30Tveitite-(Y)
    (Y, Na)
     
    6
    		Ca
     
    6
    		Ca
     
    6
    		F
     
    42
    3.AB.35Gagarinite-(Y)
    NaCaY(F,Cl)
     
    6
    3.AB.35Zajacite-(Ce)
    Na(REE
     
    x
    		Ca
     
    1-x
    		)(REE
     
    y
    		Ca
     
    1-y
    		)F
     
    6
    Related Minerals - Hey's Index Grouping:
    8.10.2Kempite
    Mn
    2+
    2
    		[(OH)
     
    3
    		|Cl]
    8.10.3Chlormanganokalite
    K
     
    4
    		[MnCl
     
    6
    		]

    Other Names for Scacchite

    Synonyms:
    Scacchite (of Adam)
    German names:
    Scacchit
    Italian names:
    Protochloruro di Manganese
    Russian names:
    Скаккит
    Spanish names:
    Scacchita

    Other Information

    Other Information:Deliquescent. Readily soluble in water.
    Health Warning: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

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    Localities for Scacchite

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    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.
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