Para-alumohydrocalcite Mineral Data

Para-alumohydrocalcite Mineral Data

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General Para-alumohydrocalcite Information

Chemical Formula:

CaAl2(CO3)2(OH)4·6(H2O)

Composition:

Molecular Weight = 390.18 gm

Calcium 10.27 % Ca 14.37 % CaO

Aluminum 13.83 % Al 26.13 % Al₂O₃

Hydrogen 4.13 % H 36.94 % H₂O

Carbon 6.16 % C 22.56 % CO₂

Oxygen 65.61 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaAl₂(CO₃)₂(OH)₄·6(H₂O)

Environment:

Oxidized zone of sulfur deposits with gypsum and calcite.

IMA Status:

Approved IMA 1977

Locality:

Vodinsk, Ukraine, and Gaurdok, Turkmenistan. Link to MinDat.org Location Data.

Name Origin:

Named after its relationship with alumohydrocalcite.

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Para-alumohydrocalcite Crystallography

Crystal System:

Triclinic

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

By Intensity(I/I_o): 7.9(1), 2.64(0.32), 6.2(0.3),

Physical Properties of Para-alumohydrocalcite

Color:

White, Colorless.

Density:

Diaphaniety:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

1.5-2 - Talc-Gypsum

Streak:

white

Optical Properties of Para-alumohydrocalcite

Gladstone-Dale:

CI meas= 0.05 (Good) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2445,KC= 0.2575

Optical Data:

Biaxial (-), a=1.473, b=1.492, g=1.502, bire=0.0290, 2V(Calc)=70, 2V(Meas)=69.

Pleochroism (x):

none.

Pleochroism (y):

none.

Pleochroism (z):

none.

Calculated Properties of Para-alumohydrocalcite

Electron Density:

r_electron=2.07 gm/cc
note: r_{Para-alumohydrocalcite}=2.00 gm/cc.

Fermion Index

Fermion Index = 0.00113
Boson Index = 0.99887

Photoelectric:

PE_{Para-alumohydrocalcite}= 1.82 barns/electron
U=PE_{Para-alumohydrocalcite} x r_electron= 3.76 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Para-alumohydrocalcite is Not Radioactive

Para-alumohydrocalcite Classification

Dana Class:

16b.2.3.2 (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.04-40 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 Para-alumohydrocalcite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Para-alumohydrocalcite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas 10 -École des Mines de Paris

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Print or Cut-and-Paste your Para-alumohydrocalcite Specimen Label here :

Para-alumohydrocalcite

CaAl2(CO3)2(OH)4·6(H2O)
Dana No: 16b.2.3.2 Strunz No: V/E.04-40
Locality:

Notes: