Scacchite
A valid IMA mineral species - grandfathered
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About Scacchite
Arcangelo Scacchi
Formula:
MnCl2
Colour:
Colourless, rose-red, darkening to brown or red-brown
Specific Gravity:
2.98
Crystal System:
Trigonal
Member of:
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:
Unique Identifiers
Mindat ID:
3549
Long-form identifier:
mindat:1:1:3549:7
Similar Names
IMA Classification of Scacchite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Mn2+Cl2
Classification of Scacchite
3.AB.20
3 : HALIDES
A : Simple halides, without H2O
B : M:X = 1:2
3 : HALIDES
A : Simple halides, without H2O
B : M:X = 1:2
9.2.3.2
9 : NORMAL HALIDES
2 : AX2
9 : NORMAL HALIDES
2 : AX2
8.10.1
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
10 : Halides of Mn
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
10 : Halides of Mn
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Sca | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Scacchite
Transparency:
Transparent
Colour:
Colourless, rose-red, darkening to brown or red-brown
Streak:
White
Cleavage:
Perfect
O {0001} ?
O {0001} ?
Density:
2.98 g/cm3 (Measured) 3.04 g/cm3 (Calculated)
Optical Data of Scacchite
Type:
Uniaxial (-)
RI values:
nω = 1.708 nε = 1.622
Max. Birefringence:
δ = 0.086
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Chemistry of Scacchite
Mindat Formula:
MnCl2
Elements listed:
Crystallography of Scacchite
Crystal System:
Trigonal
Class (H-M):
3m(32/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)
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0011809 | Scacchite | Wyckoff R W G (1963) Second edition. Interscience Publishers, New York, New York Crystal Structures 1 239-444 | 1963 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.85 Å | (100) |
| 2.592 Å | (80) |
| 3.161 Å | (25) |
| 1.8529 Å | (25) |
| 1.8118 Å | (25) |
| 1.7663 Å | (13) |
| 1.977 Å | (11) |
Comments:
Synthetic. The data are from Swanson et al. (1970).
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45b : [Other oxidized fumarolic minerals] |
Type Occurrence of Scacchite
Place of Conservation of Type Material:
No designated type material.
Synonyms of Scacchite
Other Language Names for Scacchite
Relationship of Scacchite to other Species
Member of:
Other Members of Lawrencite Group:
| Chloromagnesite | MgCl2 | Trig. 3m(32/m) : R3m |
| Lawrencite | (Fe2+,Ni)Cl2 | Trig. 3m(32/m) : R3m |
| Tolbachite | CuCl2 | Mon. 2/m : B2/m |
Related Minerals - Strunz-mindat Grouping
| 3.AB. | Manuelarossiite | PbCaAlF7 |
| 3.AB. | Fluorocronite | PbF2 |
| 3.AB.05 | Tolbachite | CuCl2 |
| 3.AB.10 | Coccinite | HgI2 |
| 3.AB.15 | Sellaite | MgF2 |
| 3.AB.20 | Lawrencite | (Fe2+,Ni)Cl2 |
| 3.AB.20 | Chloromagnesite | MgCl2 |
| 3.AB.25 | Fluorite | CaF2 |
| 3.AB.25 | Frankdicksonite | BaF2 |
| 3.AB.25 | Strontiofluorite | SrF2 |
| 3.AB.30 | Tveitite-(Y) | (Y, Na)6Ca6Ca6(Ca,Na)F42 |
| 3.AB.35 | Gagarinite-(Y) | NaCaYF6 |
| 3.AB.35 | Polezhaevaite-(Ce) | NaSrCeF6 |
| 3.AB.35 | Gagarinite-(Ce) | Na(REExCa1-x)(REEyCa1-y)F6 |
| 3.AB.37 | Calcioaravaipaite | PbCa2AlF9 |
| 3.AB.85 | Cotunnite | PbCl2 |
Other Information
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.
Internet Links for Scacchite
mindat.org URL:
https://www.mindat.org/min-3549.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Scacchite
Reference List:
Localities for Scacchite
Showing 3 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Italy (TL) | |
| Palache et al. (1951) |
| Pelloux (1927) +1 other reference | |
Poland | |
| Kruszewski (2012) |
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Mount Vesuvius, Metropolitan City of Naples, Campania, Italy