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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Visit our Advertisers for Cadwaladerite :

Dakota Matrix Minerals Google Search for Cadwaladerite
Excalibur Mineral Corp. Google Search for Cadwaladerite
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Mineral News Website Link
Mineral of the Month Club Google Search for Cadwaladerite
Rock and Mineral Shows Google Search for Cadwaladerite
Weinrich Minerals, Inc. Google Search for Cadwaladerite

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: