Mineralogy Database

Alumohydrocalcite Mineral Data

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General Alumohydrocalcite Information

Help on Chemical  Formula: Chemical Formula: CaAl2(CO3)2(OH)4•3(H2O)
Help on Composition: Composition: Molecular Weight = 336.13 gm
   Calcium   11.92 %  Ca   16.68 % CaO
   Aluminum  16.05 %  Al   30.33 % Al2O3
   Hydrogen   3.00 %  H    26.80 % H2O
   Carbon     7.15 %  C    26.19 % CO2
   Oxygen    61.88 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaAl2(CO3)2(OH)4•3(H2O)
Help on Environment: Environment: Secondary mineral associated with allophane.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1926
Help on Locality: Locality: Khakassky district, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its chemical composition.
Help on Name Pronunciation: Name Pronunciation: Alumohydrocalcite Say ALUMOHYDROCALCITE

Alumohydrocalcite Image

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Comments: Pinkish-white globular aggregates of alumohydrocalcite.
Location: Carriere de Richelle, Vise, Belgium. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Alumohydrocalcite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4494:1:0.3927
Help on Cell Dimensions: Cell Dimensions: a = 6.498, b = 14.457, c = 5.678, Z = 2; alpha = 95.83°, beta = 93.23°, gamma = 82.24° V = 524.95 Den(Calc)= 2.13
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.25(1), 6.5(0.7), 3.23(0.6),

Physical Properties of Alumohydrocalcite

Help on Cleavage: Cleavage: {100} Perfect, {010} Imperfect
Help on Color: Color: Chalky white, Bluish white, Violet, Light yellow, Gray.
Help on Density: Density: 2.23
Help on Diaphaneity: Diaphaneity: Transparent to subtranslucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms.
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Alumohydrocalcite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2549,KPDmeas= 0.2434,KC= 0.2442
Ncalc = 1.52 - 1.54
Help on Optical Data: Optical Data: Biaxial (-), a=1.485-1.502, b=1.553-1.562, g=1.57-1.585, bire=0.0830-0.0850, 2V(Calc)=50-60, 2V(Meas)=64.

Calculated Properties of Alumohydrocalcite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.28 gm/cc
note: Specific Gravity of Alumohydrocalcite =2.23 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0012485932
Boson Index = 0.9987514068
Help on Photoelectric: Photoelectric: PEAlumohydrocalcite = 2.07 barns/electron
U=PEAlumohydrocalcite x rElectron Density= 4.73 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Alumohydrocalcite is Not Radioactive

Alumohydrocalcite Classification

Help on  Dana Class: Dana Class: 16b.02.03.01 (16b)Carbonates - Hydroxyl or Halogen
  (16b.02)where (A)m (B)n (XO3)p Zq � x(H2O), with (m+n):p=3:2
  (16b.02.03)Dana Group
16b.02.03.01 Alumohydrocalcite CaAl2(CO3)2(OH)4•3(H2O) P1 1
16b.02.03.02 Para-alumohydrocalcite CaAl2(CO3)2(OH)4•6(H2O) Tri
Help on  Strunz Class: Strunz Class: 05.DB.05 05 - CARBONATES (NITRATES)
  05.D - Carbonates with Additional Anions, with H2O
  05.DB -With large and medium-sized cations
05.DB.05 Alumohydrocalcite CaAl2(CO3)2(OH)4•3(H2O) P1 1
05.DB.05 Nasledovite PbMn3Al4(CO3)4(SO4)O5•5(H2O) Tri
05.DB.05 Para-alumohydrocalcite CaAl2(CO3)2(OH)4•6(H2O) Tri

Other Alumohydrocalcite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Dana8) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Alumohydrocalcite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: 16b.02.03.01 Strunz No: 05.DB.05





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