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Cadwaladerite

Formula:
Al(OH)
 
2
Cl·4H
 
2
O
Colour:YellowLustre: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

IMA status:Questionable/Doubtful 1941
Explanation of status:Inadequate data
Strunz 8th edition ID:3/A.13-10
Nickel-Strunz 10th (pending) edition ID:3.BD.05

3 : HALIDES
B : Simple halides, with H2O
D : Simple halides with H2O and additional OH
Dana 8th edition ID:10.5.1.1

10 : OXYHALIDES AND HYDROXYHALIDES
5 : Am(O,OH)pXq
Hey's CIM Ref.:8.6.3

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

Type Locality:Cerros Pintados ("Cerro Pintados"), Pampa del Tamarugal, Iquique Province, Tarapacá Region, Chile
Year of Discovery:1941
Associated Minerals at type locality:
Halite

Physical Properties of Cadwaladerite

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

Crystallography of Cadwaladerite

Morphology:Amorphous grains and small masses.

Optical Data of Cadwaladerite

Type:Isotropic

Chemical Properties of Cadwaladerite

Formula:
Al(OH)
 
2
Cl·4H
 
2
O
Essential elements:Al, Cl, H, O
All elements listed in formula:Al, Cl, H, O

Relationship of Cadwaladerite to other Species

Related Minerals - Nickel-Strunz Grouping):
3.BD.10Lesukite
Al
 
2
(OH)
 
5
Cl·2H
 
2
O
3.BD.15Korshunovskite
Mg
 
2
[(OH)
 
3
|Cl] · 4H
 
2
O
3.BD.20Nepskoeite
Mg
 
4
[(OH)
 
7
|Cl] · 6H
 
2
O
3.BD.25Koenenite
Na
 
4
Mg
 
9
Al
 
4
Cl
 
12
(OH)
 
22
Related Minerals - Hey's Index Grouping:
8.6.1Zharchikhite
AlF(OH)
 
2
8.6.2Chloraluminite
AlCl
 
3
·6H
 
2
O
8.6.4Cryolithionite
Na
 
3
Li
 
3
[AlF
 
6
]
 
2
8.6.5Cryolite
Na
 
3
[AlF
 
6
]
8.6.6Chiolite
Na
 
3
Al
 
3
F
 
14
8.6.7Elpasolite
NaK
 
2
[AlF
 
6
]
8.6.8Weberite
Na
 
2
Mg[F|AlF
 
6
]
8.6.9Ralstonite
NaMgAl(F,OH)
 
6
·H
 
2
O
8.6.10Koenenite
Na
 
4
Mg
 
9
Al
 
4
Cl
 
12
(OH)
 
22
8.6.11 Chlor-manasseite
Mg
 
x
Al(OH)
 
2x+2
Cl·(x-0.8)H
 
2
O x about 1.75
8.6.12Gearksutite
Ca[Al(F,OH)
 
5
(H
 
2
O)]
8.6.13Prosopite
CaAl
 
2
(F,OH)
 
8
8.6.14Yaroslavite
Ca
 
3
Al
 
2
F
 
10
(OH)
 
2
·H
 
2
O
8.6.15Carlhintzeite
Ca
 
2
[F|AlF
 
6
] · H
 
2
O
8.6.16Colquiriite
CaLi[AlF
 
6
]
8.6.17Thomsenolite
NaCaAlF
 
6
·H
 
2
O
8.6.18Pachnolite
NaCaAlF
 
6
·H
 
2
O
8.6.19Zirklerite
(Fe,Mg,Ca)
 
9
Al
 
4
Cl
 
18
(OH)
 
12
·14H
 
2
O (?)

Other Names for Cadwaladerite

German names:
Cadwaladerit
Spanish names:
Cadwaladerita

Other Information

Other Information:Weakly hygroscopic.
Health Warning: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

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    Localities for Cadwaladerite

    (TL) indicates type locality. ? 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
      • Iquique 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.
    Mineral and/or Locality
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