Cadwaladerite Mineral Data

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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.

Name Pronunciation:

Cadwaladerite + Pronunciation

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

Diaphaneity:

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
Ncalc = 1.52

Optical Data:

Isotropic, n=1.513.

Calculated Properties of Cadwaladerite

Electron Density:

Bulk Density (Electron Density)=1.73 gm/cc
note: Specific Gravity of Cadwaladerite =1.66 gm/cc.

Fermion Index:

Fermion Index = 0.0002824175
Boson Index = 0.9997175825

Photoelectric:

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

Radioactivity:

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

Cadwaladerite Classification

Dana Class:

10.05.01.01 (10)Oxyhalides and Hydroxyhalides

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

(10.05.01)Dana Group

10.05.01.01 Cadwaladerite Al(OH)2Cl•4(H2O) None

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

Strunz Class:

03.BD.05 03 - HALIDES

03.B - Simple Halides, with H2O

03.BD -Simple Halides with H2O and additional OH

03.BD.05 Cadwaladerite Al(OH)2Cl•4(H2O) None

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 - 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

Search for Cadwaladerite using:

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Ask about Cadwaladerite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Cadwaladerite

Al(OH)2Cl•4(H2O)
Dana No: 10.05.01.01 Strunz No: 03.BD.05
Locality:

Notes: