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Cadwaladerite

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Formula:
AlCl(OH)2 · 4H2O
Colour:
Yellow
Lustre:
Vitreous
Name:
For Charles Meigs Biddle Cadwalader (1885-1959) President of the Academy of Natural Sciences, Philadelphia, Pennsylvania, USA.
This page provides mineralogical data about Cadwaladerite.

Classification of Cadwaladerite

Questionable/Doubtful 1941
Explanation of status:
Inadequate data
3.BD.05

3 : HALIDES
B : Simple halides, with H2O
D : Simple halides with H2O and additional OH
10.5.1.1

10 : OXYHALIDES AND HYDROXYHALIDES
5 : Am(O,OH)pXq
8.6.3

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
6 : Halides of Al
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First Recorded Occurrence of Cadwaladerite

Year of Discovery:
1941
Associated Minerals at First Recorded Locality:

Physical Properties of Cadwaladerite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Yellow
Fracture:
Conchoidal
Density:
1.66 g/cm3 (Measured)    

Crystallography of Cadwaladerite

Morphology:
Amorphous grains and small masses.

Optical Data of Cadwaladerite

Type:
Isotropic

Chemical Properties of Cadwaladerite

Formula:
AlCl(OH)2 · 4H2O
Essential elements:
All elements listed in formula:

Relationship of Cadwaladerite to other Species

3.BD.10LesukiteAl2Cl(OH)5 · 2H2O
3.BD.15KorshunovskiteMg2Cl(OH)3 · 4H2O
3.BD.20NepskoeiteMg4Cl(OH)7 · 6H2O
3.BD.25KoeneniteNa4Mg9Al4Cl12(OH)22
8.6.1ZharchikhiteAlF(OH)2
8.6.2ChloraluminiteAlCl3 · 6H2O
8.6.4CryolithioniteNa3Li3[AlF6]2
8.6.5CryoliteNa3[AlF6]
8.6.6ChioliteNa5Al3F14
8.6.7ElpasoliteNaK2[AlF6]
8.6.8WeberiteNa2Mg[AlF6]F
8.6.9RalstoniteNaMg[Al(F,OH)6] · H2O
8.6.10KoeneniteNa4Mg9Al4Cl12(OH)22
8.6.11 Chlor-manasseiteMgxAl(OH)2x+2Cl · (x-0.8)H2O x about 1.75
8.6.12GearksutiteCa[Al(F,OH)5(H2O)]
8.6.13ProsopiteCaAl2(F,OH)8
8.6.14YaroslaviteCa3Al2F10(OH)2 · H2O
8.6.15CarlhintzeiteCa2[AlF6]F · H2O
8.6.16ColquiriiteCaLi[AlF6]
8.6.17ThomsenoliteNaCa[AlF6] · H2O
8.6.18PachnoliteNaCa[AlF6] · H2O
8.6.19Zirklerite(Fe,Mg,Ca)9Al4Cl18(OH)12 · 14H2O (?)

Other Names for Cadwaladerite

Name in Other Languages:

Other Information

Other Information:
Weakly hygroscopic.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Cadwaladerite

Reference List:
Gordon (1941) Academy of Natural Science of Philadelphia, Notulae Naturae, no. 80, April, 1941.

American Mineralogist (1942): 27: 144.

Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume II: 77.

Internet Links for Cadwaladerite

Localities for Cadwaladerite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Chile
 
  • Tarapacá Region
    • El Tamarugal Province
      • Pampa del Tamarugal
Notulae Naturae, Acad.Nat.Sci., Philadelphia (1941) no. 80, 4 pp.; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 77.
Iran
 
  • Yazd Province
    • Saghand (Sagand; Saqand)
Vincent Bourgoin
Mineral and/or Locality  
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