Hydrocalumite Mineral Data

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)

Environment:

Late-stage hydrothermal mineral in skarns formed from contact metamorphism of limestone

IMA Status:

Valid Species (Pre-IMA) 1934

Locality:

Scawt Hill, near Larne, Co. Antrim, Ireland. Link to MinDat.org Location Data.

Name Origin:

Named for a HYDROus mineral containing CAlcium and ALUMinum.

Name Pronunciation:

Hydrocalumite + Pronunciation

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

Diaphaneity:

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
Ncalc = 1.58 - 1.6

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:

Bulk Density (Electron Density)=2.23 gm/cc
note: Specific Gravity of Hydrocalumite =2.15 gm/cc.

Fermion Index:

Fermion Index = 0.0006324168
Boson Index = 0.9993675832

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hydrocalumite is Not Radioactive

Hydrocalumite Classification

Dana Class:

06.04.04.01 (06)Hydroxides and Oxides Containing Hydroxyl

(06.04)containing multiple cations

(06.04.04)Dana Group

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

Strunz Class:

04.FL.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.F - Hydroxides (without V or U)

04.FL -Hydroxides with H2O ± (OH); sheets of edge-sharing octahedra

04.FL.10 Hydrocalumite Ca2Al(OH)6[Cl1-x(OH)x]•3(H2O) P 2₁ 2

Other Hydrocalumite Information

References:

NAME( AntBidBlaNic3) 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 - 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
15 - WWW-MINCRYST

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Ask about Hydrocalumite here :
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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: 06.04.04.01 Strunz No: 04.FL.10
Locality:

Notes: