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Coralloite

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Formula:
Mn
2+
 
Mn
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
System:Triclinic


Structurally related to the Arthurite Group, bermanite (chemically the phosphate analogue of coralloite) and ercitite.

Classification of Coralloite

IMA status:Approved 2010
Nickel-Strunz 10th (pending) edition ID:8.DC.20

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
Dana 8th edition ID:42.11.19.3

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O
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Type Occurrence of Coralloite

Type Locality:Monte Nero Mine, Rocchetta Vara, La Spezia Province, Liguria, Italy

Crystallography of Coralloite

Crystal System:Triclinic
Class (H-M):1 - Pedial
Space Group:P1
Cell Parameters:a = 5.5828(7) Å, b = 9.7660(13) Å, c = 5.5455(7) Å
α = 94.467(3)°, β = 111.348(2)°, γ = 93.85(2)°
Ratio:a:b:c = 0.572 : 1 : 0.568
Unit Cell Volume:V 279.26 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
9.710 (100)
5.166 (77)
5.136 (80)
3.342 (65)
3.324 (34)
2.873 (22)
2.631 (23)
2.565 (22)

Chemical Properties of Coralloite

Formula:
Mn
2+
 
Mn
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
Simplified for copy/paste:Mn2+Mn3+2(AsO4)2(OH)2·4H2O
Essential elements:As, H, Mn, O
All elements listed in formula:As, H, Mn, O

Relationship of Coralloite to other Species

Structurally related to group(s):
Arthurite Group
M
2+
 
M
3+
2
(TO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
8.DC.05Nissonite
Cu
 
2
Mg
 
2
(PO
 
4
)
 
2
(OH)
 
2
· 5H
 
2
O
8.DC.07Euchroite
Cu
 
2
(AsO
 
4
)(OH) · 3H
 
2
O
8.DC.10Legrandite
Zn
 
2
(AsO
 
4
)(OH) · H
 
2
O
8.DC.12Strashimirite
Cu
 
8
(AsO
 
4
)
 
4
(OH)
 
4
· 5H
 
2
O
8.DC.15Arthurite
CuFe
3+
2
(AsO
 
4
,PO
 
4
,SO
 
4
)
 
2
(OH,O)
 
2
· 4H
 
2
O
8.DC.15Earlshannonite
Mn
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
8.DC.15Ojuelaite
ZnFe
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
8.DC.15Whitmoreite
Fe
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
8.DC.15Cobaltarthurite
(Co,Mg)Fe
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
8.DC.15Bendadaite
Fe
2+
 
Fe
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
8.DC.15Kunatite
CuFe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
8.DC.15UKI-2006-(PO:FeHZn)
ZnFe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
8.DC.15UKI-2006-(PO:AlCuFeH)
Fe
2+
 
Al
 
3
(PO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
8.DC.17Kleemanite
ZnAl
 
2
(PO
 
4
)
 
2
(OH)
 
2
· 3H
 
2
O
8.DC.20Bermanite
Mn
2+
 
Mn
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
8.DC.22Kovdorskite
Mg
 
2
(PO
 
4
)(OH) · 3H
 
2
O
8.DC.25Ferristrunzite
Fe
3+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
3
· 5H
 
2
O
8.DC.25Ferrostrunzite
Fe
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 6H
 
2
O
8.DC.25Metavauxite
Fe
2+
 
Al
 
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
8.DC.25Metavivianite
Fe
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 6H
 
2
O
8.DC.25Strunzite
Mn
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 6H
 
2
O
8.DC.27Beraunite
Fe
2+
 
Fe
3+
5
(PO
 
4
)
 
4
(OH)
 
5
· 6H
 
2
O
8.DC.30Gordonite
MgAl
 
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
8.DC.30Laueite
Mn
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
8.DC.30Mangangordonite
Mn
2+
 
Al
 
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
8.DC.30Paravauxite
Fe
2+
 
Al
 
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
8.DC.30Pseudolaueite
Mn
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
8.DC.30Sigloite
Fe
3+
 
Al
 
2
(PO
 
4
)
 
2
(OH)
 
3
· 7H
 
2
O
8.DC.30Stewartite
Mn
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
8.DC.30Ushkovite
MgFe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
8.DC.30Ferrolaueite
Fe
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
8.DC.30Kastningite
(Mn
2+
 
,Fe
2+
 
,Mg)Al
 
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
8.DC.30Maghrebite
MgAl
 
2
(AsO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
8.DC.30Nordgauite
MnAl
 
2
(PO
 
4
)
 
2
(F,OH)
 
2
· 5H
 
2
O
8.DC.32Tinticite
Fe
3+
5.34
(PO
 
4
)
 
3.62
(VO
 
4
)
 
0.38
(OH)
 
4
· 6.7H
 
2
O
8.DC.35Vauxite
Fe
2+
 
Al
 
2
(PO
 
4
)
 
2
(OH)
 
2
· 6H
 
2
O
8.DC.37Vantasselite
Al
 
4
(PO
 
4
)
 
3
(OH)
 
3
· 9H
 
2
O
8.DC.40Cacoxenite
Fe
3+
24
Al(PO
 
4
)
 
17
O
 
6
(OH)
 
12
· 17H
 
2
O
8.DC.45Gormanite
(Fe
2+
 
,Mg)
 
3
(Al,Fe
3+
 
)
 
4
(PO
 
4
)
 
4
(OH)
 
6
· 2H
 
2
O
8.DC.45Souzalite
(Mg,Fe
2+
 
)
 
3
(Al,Fe
3+
 
)
 
4
(PO
 
4
)
 
4
(OH)
 
6
· 2H
 
2
O
8.DC.47Kingite
Al
 
3
(PO
 
4
)
 
2
F
 
2
(OH) · 7H
 
2
O
8.DC.50Wavellite
Al
 
3
(PO
 
4
)
 
2
(OH,F)
 
3
· 5H
 
2
O
8.DC.50Allanpringite
Fe
3+
3
(PO
 
4
)
 
2
(OH)
 
3
· 5H
 
2
O
8.DC.52Kribergite
Al
 
5
(PO
 
4
)
 
3
(SO
 
4
)(OH)
 
4
· 4H
 
2
O
8.DC.55Mapimite
Zn
 
2
Fe
3+
3
(AsO
 
4
)
 
3
(OH)
 
4
· 10H
 
2
O
8.DC.57Ogdensburgite
Ca
 
2
Fe
3+
4
(Zn,Mn
2+
 
)(AsO
 
4
)
 
4
(OH)
 
6
· 6H
 
2
O
8.DC.60Nevadaite
(Cu
2+
 
,Al,V
3+
 
)
 
6
Al
 
8
(PO
 
4
)
 
8
F
 
8
(OH)
 
2
· 22H
 
2
O
8.DC.60Cloncurryite
(Cu,VO)Al
 
2
(PO
 
4
)
 
2
(F,OH)
 
2
· 4.5-5H
 
2
O

Other Names for Coralloite

Synonyms:
IMA2010-012
Other Languages:

Other Information

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 Coralloite

Reference List:

- +
Callegari, A.M., Boiocchi, M., Ciriotti, M.E. and Balestra, C. (2010) Coralloite, IMA 2010-012. CNMNC Newsletter, June 2010, page 579; Mineralogical Magazine, 74, 577-579.

Callegari, A.M., Boiocchi, M., Ciriotti, M.E., Balestra, C. (2012): Coralloite, Mn2+Mn3+2(AsO4)2(OH)2•4H2O, a new mixed valence Mn hydrate arsenate: Crystal structure and relationships with bermanite and whitmoreite mineral groups. American Mineralogist, 97, 727-734.

Internet Links for Coralloite

Search Engines:
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  • External Links:
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  • Look for Coralloite on Athena Mineralogy
  • Look for Coralloite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
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  • Coralloite specimens for sale - minfind.com
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  • The Arkenstone - Fine Minerals
  • Localities for Coralloite

    The 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. ? 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
     
    • Liguria
      • La Spezia Province
        • Rocchetta Vara
    Callegari, A.M., Boiocchi, M., Ciriotti, M.E. and Balestra, C. (2010) Coralloite, IMA 2010-012. CNMNC Newsletter, June 2010, page 579; Mineralogical Magazine, 74, 577-579; Callegari, A.M., Boiocchi, M., Ciriotti, M.E., Balestra, C. (2012): Coralloite, Mn2+Mn3+2(AsO4)2(OH)2•4H2O, a new mixed valence Mn hydrate arsenate: Crystal structure and relationships with bermanite and whitmoreite mineral groups. American Mineralogist, 97, 727-734.
    Switzerland
     
    • Grischun (Grisons; Graubünden)
      • Albula Valley
        • Oberhalbstein (Surses; Sursass)
          • Tinizong (Tinzen)
    http://homepage.swissonline.ch/KlingerMinerals/mineralien-falotta-e.htm
      • Hinterrhein Valley
        • Rheinwald
          • Splügen
    - Found by Franco Vanini, probed by Nicolas Meisser October 2010, collection P. Roth. - Roth, P. & Meisser, N. (2011): I minerali dell'Alpe Tanatz. Passo dello Spluga (Grigioni, Svizzera). Rivista Mineralogica Italiana, 2/2011, 90-99
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