Hydrocalumite Mineral Data

Hydrocalumite Mineral Data +

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General Hydrocalumite Information

Chemical Formula:

Ca2Al(OH)6[Cl1-x(OH)x]·3(H2O)

Composition:

Molecular Weight = 289.46 gm

Calcium 27.69 % Ca 38.75 % CaO

Aluminum 9.32 % Al 17.61 % Al₂O₃

Hydrogen 4.35 % H 38.90 % H₂O

Chlorine 6.12 % Cl 6.12 % Cl

- % Cl -1.38 % -O=Cl₂

Oxygen 52.51 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Al(OH)_6.5Cl_0.5·3(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1934

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 63250

PDF 31-245

Hydrocalumite Image

Images:

Hydrocalumite

Comments: Bright white platy crystal aggregate of hydrocalumite.
Location: Boissejour, Puy-de-Dome, France. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hydrocalumite Crystallography

Axial Ratios:

a:b:c =0.8421:1:1.4771

Cell Dimensions:

a = 9.6, b = 11.4, c = 16.84, Z = 8; beta = 111° V = 1,720.56 Den(Calc)= 2.23

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 2₁

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

By Intensity(I/I_o): 7.86(1), 3.93(0.6), 2.89(0.5),

Crystal Structure:

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Sacerdoti M , Passaglia E , Neues Jahrbuch fur Mineralogie, Monatshefte , 1988 (1988) p.462-475, Hydrocalumite from Latium, Italy: its crystal structure and relationship, with related synthetic phases, Locality: Montalto di Castro, Viterbo, Latium, Italy

View Additional jPOWD Structure files for Hydrocalumite
[1]

Physical Properties of Hydrocalumite

Cleavage:

[001] Perfect

Color:

Colorless, Light green.

Density:

2.15

Diaphaniety:

Transparent

Hardness:

3 - Calcite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Hydrocalumite

Gladstone-Dale:

CI meas= 0.053 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.087 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2459,KPDmeas= 0.255,KC= 0.2694

Optical Data:

Biaxial (-), a=1.535, b=1.553, g=1.557, bire=0.0220, 2V(Calc)=50, 2V(Meas)=24.

Calculated Properties of Hydrocalumite

Electron Density:

r_electron=2.23 gm/cc
note: r_{Hydrocalumite}=2.15 gm/cc.

Fermion Index

Fermion Index = 0.00063
Boson Index = 0.99937

Photoelectric:

PE_{Hydrocalumite}= 4.05 barns/electron
U=PE_{Hydrocalumite} x r_electron= 9.02 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hydrocalumite is Not Radioactive

Hydrocalumite Classification

Dana Class:

6.4.4.1 (6)Hydroxides and Oxides Containing Hydroxyl

(6.4)containing multiple cations

(6.4.4)Dana Group

6.4.4.1 Hydrocalumite Ca2Al(OH)6[Cl1-x(OH)x]·3(H2O) P 2₁ 2

Strunz Class:

IV/F.10-10 IV - Oxides

IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure

IV/F.10 - Hydrokalumite series

IV/F.10-10 Hydrocalumite Ca2Al(OH)6[Cl1-x(OH)x]·3(H2O) P 2₁ 2

IV/F.10-20 Kuzelite! Ca4Al2.4(OH)12.8(SO4)·6(H2O) R 3 3

Other Hydrocalumite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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

Hydrocalumite

Ca2Al(OH)6[Cl1-x(OH)x]·3(H2O)
Dana No: 6.4.4.1 Strunz No: IV/F.10-10
Locality:

Notes: