Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery


This page is currently not sponsored. Click here to sponsor this page.
CaAl2(CO3)2(OH)4 · 3H2O
Chalky white to pale ...
In allusion to the composition, containing ALUMinium, water (HYDRated) and a calcium carbonate (CALCITE) component.

Classification of Alumohydrocalcite

Approved, 'Grandfathered' (first described prior to 1959)

D : Carbonates with additional anions, with H2O
B : With large and medium-sized cations

2 : AmBn(XO3)pZqxH2O & with (m+n):p = 3:2

11 : Carbonates
7 : Carbonates of Al

Physical Properties of Alumohydrocalcite

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

Optical Data of Alumohydrocalcite

Biaxial (-)
RI values:
nα = 1.485 - 1.502 nβ = 1.553 - 1.562 nγ = 1.570 - 1.585
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:
r > v strong

Chemical Properties of Alumohydrocalcite

IMA Formula:
CaAl2(CO3)2(OH)4 · 3H2O Formula:
CaAl2(CO3)2(OH)4 · 4H2O

Previously assumed to have only three water molecules per formula unit.
Elements listed in formula:
Common Impurities:

Crystallography of Alumohydrocalcite

Crystal System:
Class (H-M):
1 - Pinacoidal
Space Group:
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)°
a:b:c = 0.873 : 1 : 2.232
Unit Cell Volume:
V 537 ų
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:
7.21 (30)
6.50 (70)
6.25 (100)
3.23 (60)
2.860 (30)
2.519 (40)
2.039 (50)

Occurrences of Alumohydrocalcite

Type Occurrence of Alumohydrocalcite

Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia,
Associated Minerals at Type Locality:

Relationship of Alumohydrocalcite to other Species

Other Members of Group:
DresseriteBaAl2(CO3)2(OH)4 · H2O
DundasitePbAl2(CO3)2(OH)4 · H2O
HydrodresseriteBaAl2(CO3)2(OH)4 · 3H2O
KochsándoriteCaAl2(CO3)2(OH)4 · H2O
PetterditePbCr23+(CO3)2(OH)4 · H2O
StrontiodresseriteSrAl2(CO3)2(OH)4 · H2O
Unnamed (Ca-analogue of Petterdite)CaCr23+(CO3)2(OH)4 · H2O
5.DB.05NasledovitePbMn32+Al4O5(SO4)(CO3)4 · 5H2O
5.DB.05Para-alumohydrocalciteCaAl2(CO3)2(OH)4 · 6H2O
5.DB.05UM1977-02-CO:AlCaHCa6Al2(CO3)3O6 · 32H2O
5.DB.10DresseriteBa2Al4(CO3)4(OH)8 · 3H2O
5.DB.10DundasitePbAl2(CO3)2(OH)4 · H2O
5.DB.10MontroyaliteSr4Al8(CO3)3(OH)26 · 10H2O
5.DB.10StrontiodresseriteSrAl2(CO3)2(OH)4 · H2O
5.DB.10PetterditePbCr2(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)CuPbNd(CO3)3(OH) · 1.5H2O
5.DB.25SergeeviteCa2Mg11(CO3)9(HCO3)4(OH)4 · 6H2O
5.DB.30SzymańskiiteHg16Ni6(CO3)12(OH)12(H3O)8 · 3H2O
11.7.1ScarbroiteAl5(CO3)(OH)13 · 5H2O
11.7.2HydroscarbroiteAl14(CO3)3(OH)36 · nH2O
11.7.4HydrotalciteMg6Al2CO3(OH)16 · 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
11.7.10WermlanditeMg8Al2(OH)18(SO4)2 · 12H2O
11.7.11MontroyaliteSr4Al8(CO3)3(OH)26 · 10H2O
11.7.12DresseriteBa2Al4(CO3)4(OH)8 · 3H2O
11.7.13HydrodresseriteBaAl2(CO3)2(OH)4 · 3H2O
11.7.14StrontiodresseriteSrAl2(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, G. (1926) Alumohydrocalcite - a new species. Zapiski Rossiiskogo Mineralogicheskogo Obshchetstva: 55: 243-258.

Foshag, W.F. (1928) New mineral names. American Mineralogist: 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.

Kautz, K. (1969) Elektronenbeugung und Infrarot-Untersuchungen an Alumohydrocalcit. Neues Jahrbuch für Mineralogie, Monatshefte: 1969: 130-137.

Paar, W., Ruscha, B.S. (1977) Ein Vorkommen von Alumohydrocalcit von Chitral, Westpakistan, and neue Beobachtungen an chromhaltigem Alumohydrocalcit von Nowej Rudy, Polen (= Neurode, Schlesien). Aufschluss: 28: 269-272.

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 URL:
Please feel free to link to this page.
The following Alumohydrocalcite specimens are currently listed for sale on

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.
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.
  • 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
  • Liège Province
    • Visé
  • Namur Province
    • Namur
Blondieau, M. et al. (2012): Minéralogie de la carrière de Beez, Province de Namur (Belgique). Le Règne Minéral, 104, 5-26.
  • Occitanie
    • Gard
      • Alzon
Patrice Queneau Collection Georges Favreau collection
      • Mercoirol
G. Favreau communication, AFM annual meeting, Moulins (Allier, France)October 2012
  • 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
  • Fejér Co.
    • Bicske-Zsámbéki Basin
      • Bicske-Csordakút
      • Mány
Sajó, I.E. & Szakáll, S. (2007): Canadian Mineralogist 45, 479-483.
  • 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
      • Campigliese (Campiglia Mountains; Campiglia Ridge)
        • Campiglia Marittima
          • Madonna di Fucinaia (Madonna della Fucinaia) slag heaps
      • 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.
  • Veneto
    • Vicenza Province
      • Valli del Pasubio
        • Staro
Daleffe, A., Boscardin, M. & Rocchetti, I (2012): Alumoidrocalcite di Fonte Virgiliana, Valli del Pasubio, Vicenza .
  • Honshu Island
    • Kanto Region
      • Gunma Prefecture
        • Fujioka
American Mineralogist (1986): 71, 1022-1027.
    • Kinki Region
      • Hyogo Prefecture
        • Yabu City
          • Oya-cho
Handbook of Mineralogy
      • Mie Prefecture
        • Taki-cho
Alfredo Petrov specimens
      • Osaka Prefecture
The Mineral Species of Japan (5th ed) Matsubara
  • Shikoku Island
    • Tokushima prefecture
      • Miyoshi City
Ohe Rikosya specimens (Kyoto)
  • Batken Oblast
Canadian Mineralogist: 43: 1511-1519.; Atali A. Agakhanov et al (2005) New Data on Minerals Vol 40 pp23-28
  • Khyber Pakhtunkhwa (North-West Frontier Province)
Handbook of Mineralogy
  • Lower Silesia (Dolnośląskie)
    • Kłodzko District
      • Nowa Ruda (Neurode)
        • Kolno (Kohlendorf; Groß Köllen)
Handbook of Mineralogy
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 (TL)
  • 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
  • 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
  • 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
  • Lebap Province
    • Chardzhou
Evseev, A. A. (1995) Kazaknstan and Middle Asia. A brief Mineralogical Guide. World of Stone 8:24-30
  • England
    • North Yorkshire
Ryback G. "Alumohydrocalcite from Scarborough, North Yorkshire, and Weston Favell, Northamptonshire" Journal of the Russell Society Vol. 2 Part 1
    • Northamptonshire
Handbook of Mineralogy
    • 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
      • Tytherington Quarries
BMS Database
  • California
    • Santa Clara Co.
      • Diablo Range
        • Mount Hamilton
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
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 is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2017, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: June 24, 2017 19:57:43 Page generated: May 2, 2017 12:03:42
Go to top of page