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Alumohydrocalcite

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Formula:
CaAl2(CO3)2(OH)4 · 4H2O
Previously assumed to have only three water molecules per formula unit.
System:
Triclinic
Colour:
Chalky white to pale ...
Hardness:
Name:
In allusion to the composition, containing ALUMinium, water (HYDRated) and a calcium carbonate (CALCITE) component.

Classification of Alumohydrocalcite

Approved
5.DB.05

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
B : With large and medium-sized cations
16b.2.3.1

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
2 : AmBn(XO3)pZqxH2O & with (m+n):p = 3:2
11.7.7

11 : Carbonates
7 : Carbonates of Al
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First Recorded Occurrence of Alumohydrocalcite

Place of Conservation of First Recorded Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia,
77088.
Year of Discovery:
1926
Associated Minerals at First Recorded Locality:

Occurrences of Alumohydrocalcite

Geological Setting:
Formed at low temperature by the action of carbonated waters on allophane or dickite in dolomites and limestones; chromian varieties are typically formed near altering chromite from serpentinites.

Physical Properties of Alumohydrocalcite

Diaphaneity (Transparency):
Transparent, Translucent, Opaque
Colour:
Chalky white to pale blue, pale yellow, cream, gray; pale rose or brownish pink to dark violet in chromian varieties
Comment:
colourless in transmitted light
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
Perfect
On {100}; on {010} imperfect.

Crystallography of Alumohydrocalcite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.71(5) Å, b = 6.54(4) Å, c = 14.6(2) Å
α = 81.8(3)°, β = 83.9(3)°, γ = 86.5(7)°
Ratio:
a:b:c = 0.873 : 1 : 2.232
Unit Cell Volume:
V 537 ų
Morphology:
As fibers and needles, to 2.5 mm; commonly in radial aggregates and spherulites, feltlike crystal linings, and powdery to chalky masses.
X-Ray Powder Diffraction Data:
d-spacingIntensity
7.21 (30)
6.50 (70)
6.25 (100)
3.23 (60)
2.860 (30)
2.519 (40)
2.039 (50)

Optical Data of Alumohydrocalcite

Type:
Biaxial (-)
RI values:
nα = 1.485 - 1.502 nβ = 1.553 - 1.562 nγ = 1.570 - 1.585
2V:
Measured: 64° , Calculated: 50° to 60°
Max Birefringence:
δ = 0.085
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v strong

Chemical Properties of Alumohydrocalcite

Formula:
CaAl2(CO3)2(OH)4 · 4H2O

Previously assumed to have only three water molecules per formula unit.
Essential elements:
All elements listed in formula:
Common Impurities:
Cr

Relationship of Alumohydrocalcite to other Species

5.DB.05NasledovitePbMn3Al4(CO3)4(SO4)O5 · 5H2O
5.DB.05Para-alumohydrocalciteCaAl2(CO3)2(OH)4 · 6H2O
5.DB.05UM1977-02-CO:AlCaHCa3Al2(CO3)3O6 · 32H2O
5.DB.10DresseriteBaAl2(CO3)2(OH)4 · H2O
5.DB.10DundasitePbAl2(CO3)2(OH)4 · H2O
5.DB.10MontroyaliteSr4Al8(CO3)3(OH,F)26 · 10-11H2O
5.DB.10Strontiodresserite(Sr,Ca)Al2(CO3)2(OH)4 · H2O
5.DB.10PetterditePbCr23+(CO3)2(OH)4 · H2O
5.DB.10KochsándoriteCaAl2(CO3)2(OH)4 · H2O
5.DB.15HydrodresseriteBaAl2(CO3)2(OH)4 · 3H2O
5.DB.20Schuilingite-(Nd)PbCu(Nd,Gd,Sm,Y)(CO3)3(OH) · 1.5H2O
5.DB.25SergeeviteCa2Mg11(CO3)13 · 10H2O
5.DB.30SzymańskiiteHg16(Ni,Mg)6(CO3)12(OH)12 · 11H2O
11.7.1ScarbroiteAl5(CO3)(OH)13 · 5H2O
11.7.2HydroscarbroiteAl14(CO3)3(OH)36 · nH2O
11.7.3DawsoniteNaAlCO3(OH)2
11.7.4HydrotalciteMg6Al2(OH)16[CO3] · 4H2O
11.7.5Hydrotalcite-2HMg6Al2(CO3)(OH)16 · 4H2O
11.7.6IndigiriteMg2Al2(CO3)4(OH)2 · 15H2O
11.7.8Para-alumohydrocalciteCaAl2(CO3)2(OH)4 · 6H2O
11.7.9TunisiteNaCa2Al4(CO3)4(OH)8Cl
11.7.10WermlanditeMg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2O
11.7.11MontroyaliteSr4Al8(CO3)3(OH,F)26 · 10-11H2O
11.7.12DresseriteBaAl2(CO3)2(OH)4 · H2O
11.7.13HydrodresseriteBaAl2(CO3)2(OH)4 · 3H2O
11.7.14Strontiodresserite(Sr,Ca)Al2(CO3)2(OH)4 · H2O

Other Names for Alumohydrocalcite

Other Information

Other Information:
Readily soluble in acids. Decomposed by boiling water with separation of calcium carbonate and hydrous aluminum oxide.
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 Alumohydrocalcite

Reference List:
Bilibine (1926) Mineralogicheskoe Obshchestvo, Leningrad, Zapiski: 55: 243.

American Mineralogist (1928): 13: 569.

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: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 280-281.

Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 55: 243-258.

Neues Jahrbuch für Mineralogie, Monatshefte (1969): 130-137.

Stachowicz, M., Parafiniuk, J., Wilson, C., Coles, S. & Woźniak, K. (2015): Applications of Hirshfeld surfaces to mineralogy: An example of alumohydrocalcite, and the classification of the dundasite group minerals. American Mineralogist, 100, 110-119.

Internet Links for Alumohydrocalcite

Localities for Alumohydrocalcite

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.
Argentina
Raúl Jorge Tauber Larry´s collection.
  • Tucumán
Hugo A. Peña (1970). Minerales y rocas de aplicación de la Provincia de Tucumán. Dirección Provincial de Minas. Tucumán.
      • Sierra de La Ramada
Raúl Jorge Tauber Larry´s collection.
Austria
 
  • Carinthia
    • Gailtaler Alpen & Karnische Alpen
      • Kötschach-Mauthen
        • Dellach
G. Blass, A. Pichler: Carinthia II 193./113.:181-188 (2003)
    • Hohe Tauern
      • Reißeck group
        • Gmünd
          • Radlgraben
G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
Belgium
 
  • Liège Province
    • Visé
http://tw.strahlen.org/fotoatlas1/alumohydrocalcite_foto.html
  • Namur Province
    • Namur
Blondieau, M. et al. (2012): Minéralogie de la carrière de Beez, Province de Namur (Belgique). Le Règne Minéral, 104, 5-26.
France
 
  • Languedoc-Roussillon
    • Gard
      • Alzon
Patrice Queneau Collection
      • Mercoirol
G. Favreau communication, AFM annual meeting, Moulins (Allier, France)October 2012
Germany
 
  • North Rhine-Westphalia
    • Bergisches Land
      • Bergisch Gladbach
        • Lückerath
Karl Kautz (1968) Ein Vorkommen von Alumohydrocalcit und Allophan bei Bergisch-Gladbach. N. Jahrbuch f. Mineralogie, Monatshefte: 350-358
    • Sauerland
      • Meschede
Schnorrer-Köhler, G., (1990): Ramsbeck - Neue Minerale aus dem ehemaligen Blei-Zink-Erzrevier des Sauerlandes, Der Aufschluss, Vol. 41 (4), 211-218
  • Rhineland-Palatinate
    • Eifel
      • Gerolstein
        • Birresborn
Hentschel, G., Die Mineralien der Eifelvulkane, Weise Verlag, München (2. Auflage), 1987
      • Hillesheim
Hentschel, G., Die Lavaströme der Graulai: eine neue Fundstelle in der Westeifel, Lapis, Weise Verlag München, 09/1993
      • Laach lake volcanic complex
        • Kruft
Blass, G.; Graf, H.W., Neue mineralogische Erkenntnisse und neue Funde aus Eifel, Schwarzwald und Siegerland, Mineralien-Welt 7/2, 55, 1996
        • Mendig
          • Niedermendig
Blass, G.; Graf, H.W., Neue mineralogische Erkenntnisse und neue Funde aus Eifel, Schwarzwald und Siegerland, Mineralien-Welt 7/2, 55, 1996
Blass, G.; Graf, H.W., Neue mineralogische Erkenntnisse und neue Funde aus Eifel, Schwarzwald und Siegerland, Mineralien-Welt 7/2, 55, 1996
            • Wingertsberg
Blass, G.; Graf, H.W., Neue mineralogische Erkenntnisse und neue Funde aus Eifel, Schwarzwald und Siegerland, Mineralien-Welt 7/2, 55, 1996
Hungary
 
  • Fejér Co.
    • Bicske-Zsámbéki Basin
      • Bicske-Csordakút
      • Mány
Sajó, I.E. & Szakáll, S. (2007): Canadian Mineralogist 45, 479-483.
Italy
 
  • Tuscany
    • Grosseto Province
      • Massa Marittima
Sabelli C., Olmi F., Brizzi G., Meli R., 1996. Serrabottini (GR): recenti ritrovamenti nelle antiche discariche. Riv. Mineral. Ital., 19: 9-28.
    • Livorno Province
      • Campiglia Marittima
http://www.comune.pisa.it/apsn/Articoli/Scorie/Capattoli.htm
      • Piombino
Muenchener Micromounter-Lithothek
    • Massa-Carrara Province
      • Apuan Alps
Orlandi, P. & Criscuolo, A. (2009). Minerali del marmo delle Alpi Apuane. Pacini editore, Pisa, 180 pp.
Japan
 
  • Honshu Island
    • Kanto Region
      • Gunma Prefecture
        • Fujioka
American Mineralogist (1986): 71, 1022-1027.
    • Kinki region
      • Mie Prefecture
        • Taki-cho
Alfredo Petrov specimens
      • Osaka Prefecture
The Mineral Species of Japan (5th ed) Matsubara
Kyrgyzstan
 
  • Batken Oblast
Canadian Mineralogist: 43: 1511-1519.; Atali A. Agakhanov et al (2005) New Data on Minerals Vol 40 pp23-28
Poland
 
  • Lower Silesia (Dolnośląskie)
    • Kłodzko District
      • Nowa Ruda (Neurode)
Eligiusz Szełęg private collection; Stachowicz, M., Parafiniuk, J., Wilson, C., Coles, S. & Woźniak, K. (2015): Applications of Hirshfeld surfaces to mineralogy: An example of alumohydrocalcite, and the classification of the dundasite group minerals. American Mineralogist, 100, 110-119.
        • Przygórze
Hoehne K. 1953: Ein neues Vorkommen von chromhaltigen Alumohydrocalcit im niederschlesischen Bergbaugebiet. Neues Jb. Miner. Monatsh. H. 1
Russia
 
  • Eastern-Siberian Region
    • Khakassia Republic (Khakassy Republic; Khakassiya Republic)
      • Sorsk
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: 281.; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Slovakia
 
  • Košice Region
    • Rožňava Co.
      • Kečovo
Cílek V., 1999: Mineralogické výskumy v jeskyni Domica. Aragonit, 4, 9 – 11
  • Prešov Region
    • Bardejov Co.
Bačo,P.,Pacindová,M., 1993: Whewellit a dawsonit - epigenetická mineralizácia v puklinách pieskovca pri Cígeľke. Min.Slovaca,Bratislava, 4,277-281p
    • Snina Co.
Pauliš,P.,Ďuďa,R.,2002: Nejzajímavejší mineralogická naletište Slovenska. Kuttna,K.Hora, 136p
Spain
 
  • Catalonia
    • Barcelona
      • Baix Llobregat
        • Gavà
          • Bruguers
Bareche, E (2005) "Els minerals de Catalunya. Segle XX" Ed. Grup Mineralògic Català, Barcelona, 269 p.
      • Vallès Occidental
        • Montcada i Reixac
Mineralogistes de Catalunya (1997), VII (1): 34-55
Turkmenistan
 
  • Lebap Province
    • Chardzhou
Evseev, A. A. (1995) Kazaknstan and Middle Asia. A brief Mineralogical Guide. World of Stone 8:24-30
UK
 
  • England
    • North Yorkshire
Ryback G. "Alumohydrocalcite from Scarborough, North Yorkshire, and Weston Favell, Northamptonshire" Journal of the Russell Society Vol. 2 Part 1
    • Somerset
      • Cranmore
Turner, R.W. and Rumsey, M.S. (2010): Mineral Relationships in the Mendip Hills. Journal of the Russell Society, vol 13, pp 3-46; Turner R.W. and Rumsey, M.S. (2007) Merehead Mineralogy - an Update. Russell Soc Newsletter, No 50, pp 17-18 (March 2007)
    • South Gloucestershire (Bristol; Avon)
      • Tytherington Quarries
BMS Database
USA
 
  • California
    • Santa Clara Co.
      • Diablo Range
        • Mount Hamilton
[var: Chromian Alumohydrocalcite] Dunning, G.E., J.F. Cooper, and J.S. White (1975) Chromian alumohydrocalcite from California and knipovichite discredited. Mineralogical Record: 6: 180-183; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 198.
    • Stanislaus Co.
      • Diablo Range
        • Orestimba District
          • Rooster Comb
[var: Chromian Alumohydrocalcite] Dunning, G. E. (2000): Chromian dawsonite and chromian alumohydrocalcite from Orestimba Creek, Stanislaus County, California. Mineralogical Record 31, 333-338.
  • Nevada
    • Nye Co.
      • Paradise Range
        • Gabbs District
NBMG Spec. Pub. 31 Minerals of Nevada
Mineral and/or Locality  
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