Alumohydrocalcite Mineral Data

Alumohydrocalcite Mineral Data +

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General Alumohydrocalcite Information

Chemical Formula:

CaAl2(CO3)2(OH)4·3(H2O)

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

Empirical Formula:

CaAl₂(CO₃)₂(OH)₄·3(H₂O)

Environment:

Secondary mineral associated with allophane.

IMA Status:

Valid Species (Pre-IMA) 1926

Locality:

Khakassky district, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after its chemical composition.

Alumohydrocalcite Image

Images:

Alumohydrocalcite

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

Alumohydrocalcite Crystallography

Axial Ratios:

a:b:c =0.4494:1:0.3927

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

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 6.25(1), 6.5(0.7), 3.23(0.6),

Physical Properties of Alumohydrocalcite

Cleavage:

[100] Perfect, [010] Imperfect

Color:

Chalky white, Bluish white, Violet, Light yellow, Gray.

Density:

2.23

Diaphaniety:

Transparent to subtranslucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Alumohydrocalcite

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

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

Electron Density:

r_electron=2.28 gm/cc
note: r_{Alumohydrocalcite}=2.23 gm/cc.

Fermion Index

Fermion Index = 0.00124
Boson Index = 0.99876

Photoelectric:

PE_{Alumohydrocalcite}= 2.07 barns/electron
U=PE_{Alumohydrocalcite} x r_electron= 4.73 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Alumohydrocalcite is Not Radioactive

Alumohydrocalcite Classification

Dana Class:

16b.2.3.1 (16b)Carbonates - Hydroxyl or Halogen

(16b.2)where (A)m (B)n (XO3)p Zq · x(H2O), with (m+n):p=3:2

(16b.2.3)Dana Group

16b.2.3.1 Alumohydrocalcite CaAl2(CO3)2(OH)4·3(H2O) P1 1

16b.2.3.2 Para-alumohydrocalcite CaAl2(CO3)2(OH)4·6(H2O) Tri

Strunz Class:

V/E.04-30 V - Nitrates, Carbonates and Borates

V/E - Water-bearing carbonates with unfamiliar anions

V/E.04 - Scarbroite - Para-alumohydrocalcite series

V/E.04-10 Scarbroite Al5(CO3)(OH)13·5(H2O) P1 or P1 Tri

V/E.04-20 Hydroscarbroite Al14(CO3)3(OH)36·n(H2O) Tri

V/E.04-30 Alumohydrocalcite CaAl2(CO3)2(OH)4·3(H2O) P1 1

V/E.04-40 Para-alumohydrocalcite CaAl2(CO3)2(OH)4·6(H2O) Tri

Other Alumohydrocalcite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Dana8) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Alumohydrocalcite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Print or Cut-and-Paste your Alumohydrocalcite Specimen Label here :

Alumohydrocalcite

CaAl2(CO3)2(OH)4·3(H2O)
Dana No: 16b.2.3.1 Strunz No: V/E.04-30
Locality:

Notes: