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Coralloite

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Formula:
Mn2+Mn23+(AsO4)2(OH)2 · 4H2O
System:
Triclinic
Structurally related to the Arthurite Group, bermanite (chemically the phosphate analogue of coralloite) and ercitite.

Classification of Coralloite

Approved 2010
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
42.11.19.3

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

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
X-Ray Powder Diffraction Data:
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:
Mn2+Mn23+(AsO4)2(OH)2 · 4H2O
Essential elements:
All elements listed in formula:

Relationship of Coralloite to other Species

Structurally related to group(s):
Arthurite GroupM2+M23+(TO4)2(OH)2 · 4H2O
8.DC.05NissoniteCu2Mg2(PO4)2(OH)2 · 5H2O
8.DC.07EuchroiteCu2(AsO4)(OH) · 3H2O
8.DC.10LegranditeZn2(AsO4)(OH) · H2O
8.DC.12StrashimiriteCu8(AsO4)4(OH)4 · 5H2O
8.DC.15ArthuriteCuFe23+(AsO4)2(OH)2 · 4H2O
8.DC.15EarlshannoniteMn2+Fe23+(PO4)2(OH)2 · 4H2O
8.DC.15OjuelaiteZnFe23+(AsO4)2(OH)2 · 4H2O
8.DC.15WhitmoreiteFe2+Fe23+(PO4)2(OH)2 · 4H2O
8.DC.15Cobaltarthurite(Co,Mg)Fe23+(AsO4)2(OH)2 · 4H2O
8.DC.15BendadaiteFe2+Fe23+(AsO4)2(OH)2 · 4H2O
8.DC.15KunatiteCuFe23+(PO4)2(OH)2 · 4H2O
8.DC.15UKI-2006-(PO:FeHZn)ZnFe23+(PO4)2(OH)2 · 4H2O
8.DC.15UKI-2006-(PO:AlCuFeH)Fe2+Al3(PO4)2(OH)2 · 4H2O
8.DC.17KleemaniteZnAl2(PO4)2(OH)2 · 3H2O
8.DC.20BermaniteMn2+Mn23+(PO4)2(OH)2 · 4H2O
8.DC.22KovdorskiteMg2(PO4)(OH) · 3H2O
8.DC.25FerristrunziteFe3+Fe23+(PO4)2(OH)3 · 5H2O
8.DC.25FerrostrunziteFe2+Fe23+(PO4)2(OH)2 · 6H2O
8.DC.25MetavauxiteFe2+Al2(PO4)2(OH)2 · 8H2O
8.DC.25MetavivianiteFe2+Fe23+(PO4)2(OH)2 · 6H2O
8.DC.25StrunziteMn2+Fe23+(PO4)2(OH)2 · 6H2O
8.DC.27BerauniteFe2+Fe53+(PO4)4(OH)5 · 6H2O
8.DC.30GordoniteMgAl2(PO4)2(OH)2 · 8H2O
8.DC.30LaueiteMn2+Fe23+(PO4)2(OH)2 · 8H2O
8.DC.30MangangordoniteMn2+Al2(PO4)2(OH)2 · 8H2O
8.DC.30ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2O
8.DC.30PseudolaueiteMn2+Fe23+(PO4)2(OH)2 · 8H2O
8.DC.30SigloiteFe3+Al2(PO4)2(OH)3 · 7H2O
8.DC.30StewartiteMn2+Fe23+(PO4)2(OH)2 · 8H2O
8.DC.30UshkoviteMgFe23+(PO4)2(OH)2 · 8H2O
8.DC.30FerrolaueiteFe2+Fe23+(PO4)2(OH)2 · 8H2O
8.DC.30Kastningite(Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2O
8.DC.30MaghrebiteMgAl2(AsO4)2(OH)2 · 8H2O
8.DC.30NordgauiteMnAl2(PO4)2(F,OH)2 · 5H2O
8.DC.32TinticiteFe3+5.34(PO4)3.62(VO4)0.38(OH)4 · 6.7H2O
8.DC.35VauxiteFe2+Al2(PO4)2(OH)2 · 6H2O
8.DC.37VantasseliteAl4(PO4)3(OH)3 · 9H2O
8.DC.40CacoxeniteFe243+Al(PO4)17O6(OH)12 · 17H2O
8.DC.45Gormanite(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
8.DC.45Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
8.DC.47KingiteAl3(PO4)2F2(OH) · 7H2O
8.DC.50WavelliteAl3(PO4)2(OH,F)3 · 5H2O
8.DC.50AllanpringiteFe33+(PO4)2(OH)3 · 5H2O
8.DC.52KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2O
8.DC.55MapimiteZn2Fe33+(AsO4)3(OH)4 · 10H2O
8.DC.57OgdensburgiteCa2Fe43+(Zn,Mn2+)(AsO4)4(OH)6 · 6H2O
8.DC.60Nevadaite(Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2O
8.DC.60Cloncurryite(Cu,VO)Al2(PO4)2(F,OH)2 · 4.5-5H2O

Other Names for Coralloite

Name in Other Languages:

Other Information

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 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

Localities for Coralloite

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
 
  • 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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