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Cadwaladerite

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Formula:
AlCl(OH)2 · 4H2O
Colour:
Yellow
Lustre:
Vitreous
Specific Gravity:
1.66
Crystal System:
Amorphous
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.


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Classification of CadwaladeriteHide

Approved, 'Grandfathered' (first described prior to 1959), Questionable
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

Physical Properties of CadwaladeriteHide

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

Optical Data of CadwaladeriteHide

Type:
Isotropic

Chemical Properties of CadwaladeriteHide

Formula:
AlCl(OH)2 · 4H2O

Crystallography of CadwaladeriteHide

Crystal System:
Amorphous
Morphology:
Amorphous grains and small masses.

Type Occurrence of CadwaladeriteHide

Other Language Names for CadwaladeriteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Lesukite1 photo of Cadwaladerite associated with Lesukite on mindat.org.
Jarosite1 photo of Cadwaladerite associated with Jarosite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

3.BD.10LesukiteAl2Cl(OH)5 · 2H2OIso. m3m (4/m 3 2/m) : Im3m
3.BD.15KorshunovskiteMg2Cl(OH)3 · 4H2OTric.
3.BD.20NepskoeiteMg4Cl(OH)7 · 6H2OOrth.
3.BD.25KoeneniteNa4Mg9Al4Cl12(OH)22Trig. 3m (3 2/m) : R3m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.6.1ZharchikhiteAlF(OH)2Mon.
8.6.2ChloraluminiteAlCl3 · 6H2OTrig.
8.6.4CryolithioniteNa3Li3[AlF6]2Iso. m3m (4/m 3 2/m) : Ia3d
8.6.5CryoliteNa2NaAlF6Mon. 2/m
8.6.6ChioliteNa5Al3F14Tet. 4/mmm (4/m 2/m 2/m) : P4/mnc
8.6.7ElpasoliteK2NaAlF6Iso. m3 (2/m 3) : Pa3
8.6.8WeberiteNa2Mg[AlF6]FOrth. mmm (2/m 2/m 2/m) : Immm
8.6.9Hydrokenoralstonite Na0.5(Al,Mg)2(F,OH)6•H2O Iso. m3m (4/m 3 2/m) : Fd3m
8.6.10KoeneniteNa4Mg9Al4Cl12(OH)22Trig. 3m (3 2/m) : R3m
8.6.11 Chlor-manasseiteMgxAl(OH)2x+2Cl · (x-0.8)H2O
x about 1.75
8.6.12GearksutiteCa[Al(F,OH)5(H2O)]Tric. 1 : P1
8.6.13ProsopiteCaAl2F4[(OH)4-xFx], x = 0.0–1.0Mon. 2/m : B2/b
8.6.14YaroslaviteCa3Al2F10(OH)2 · H2OOrth.
8.6.15CarlhintzeiteCa2[AlF6]F · H2OTric.
8.6.16ColquiriiteCaLi[AlF6]Trig.
8.6.17ThomsenoliteNaCa[AlF6] · H2OMon. 2/m : P21/b
8.6.18PachnoliteNaCa[AlF6] · H2OMon. 2/m
8.6.19Zirklerite(Fe,Mg,Ca)9Al4Cl18(OH)12 · 14H2O (?)Trig.

Other InformationHide

Notes:
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 CadwaladeriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 CadwaladeriteHide

Localities for CadwaladeriteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Chile (TL)
 
  • 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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