Cadwaladerite Mineral Data

Cadwaladerite Mineral Data +

General Cadwaladerite Information

Chemical Formula:

Al(OH)2Cl·4(H2O)

Composition:

Molecular Weight = 168.51 gm

Aluminum 16.01 % Al 30.25 % Al₂O₃

Hydrogen 5.98 % H 53.45 % H₂O

Chlorine 21.04 % Cl 21.04 % Cl

- % Cl -4.75 % -O=Cl₂

Oxygen 56.97 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al(OH)₂Cl·4(H₂O)

Environment:

In a sulfate deposit, embedded in halite.

IMA Status:

Valid Species (Pre-IMA) 1941

Locality:

On mine dumps at Cerro Pintados, 80 km southeast of Iquique, Tarapaca, Chile. Link to MinDat.org Location Data.

Name Origin:

For Charles Meigs Biddle Cadwalader, formerly President of the Academy of Natural Sciences, Philadelphia, Pennsylvania, USA.

Cadwaladerite Image

Images:

Cadwaladerite

Comments: Yellow crystalline grain of cadwaladerite, somewhat deliquescent.
Location: Cerro Pintados, south east of Iquique, Tarapaca, Chile. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Cadwaladerite Crystallography

Crystal System:

Amorphous- No Crystals

Physical Properties of Cadwaladerite

Cleavage:

None

Color:

Lemon.

Density:

1.66

Diaphaniety:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Luster:

Vitreous (Glassy)

Optical Properties of Cadwaladerite

Gladstone-Dale:

CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.309,KC= 0.3109

Optical Data:

Isotropic, n=1.513.

Calculated Properties of Cadwaladerite

Electron Density:

r_electron=1.73 gm/cc
note: r_{Cadwaladerite}=1.66 gm/cc.

Fermion Index

Fermion Index = 0.00028
Boson Index = 0.99972

Photoelectric:

PE_{Cadwaladerite}= 1.92 barns/electron
U=PE_{Cadwaladerite} x r_electron= 3.33 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cadwaladerite is Not Radioactive

Cadwaladerite Classification

Dana Class:

10.5.1.1 (10)Oxyhalides and Hydroxyhalides

(10.5)where Am (O,OH)p Xq

(10.5.1)Dana Group

10.5.1.1 Cadwaladerite Al(OH)2Cl·4(H2O) None

10.5.1.2 Lesukite! Al2(OH)5Cl·2(H2O) I m3m 4/m 3 2/m

Strunz Class:

III/A.13-10 III - Halogenides

III/A - Simple Halogenides, with water Metal : Halogen = 1 : 1 to 1 : 3

III/A.13 - Cadwaladerite - Hydromolysite series

III/A.13-05 Lesukite! Al2(OH)5Cl·2(H2O) I m3m 4/m 3 2/m

III/A.13-10 Cadwaladerite Al(OH)2Cl·4(H2O) None

III/A.13-20 Chloraluminite AlCl3·6(H2O) R 3c 3 2/m

III/A.13-30 Hydromolysite? FeCl3·6(H2O) C 2/m 2/m

Other Cadwaladerite 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 Cadwaladerite :
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 -École des Mines de Paris

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

Cadwaladerite

Al(OH)2Cl·4(H2O)
Dana No: 10.5.1.1 Strunz No: III/A.13-10
Locality:

Notes: