Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Chat Now! (2 online) Mindat Auctions

Crandallite

Big Photo

Azcárate Quarry, Eugui, Esteribar, Navarre, Spain
© Carlos Pareja

Show Crandallite Photos (36)
Formula:
CaAl
 
3
[(OH)
 
5
|(PO
 
4
)
 
2
] · H
 
2
O
System:TrigonalColour:Yellow, white, grey; ...
Lustre:Vitreous, DullHardness:5
Name:For engineer, Milan L. Crandall, Jr., of Knight Syndicate, Provo, Utah, USA


Alunite Supergroup, Crandallite Subgroup.
The calcium analogue of Plumbogummite and the phosphate analogue of Arsenocrandallite.

Classification of Crandallite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/B.36-10
Nickel-Strunz 10th (pending) edition ID:8.BL.10

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
L : With medium-sized and large cations, (OH, etc.):RO4 = 3:1
Dana 8th edition ID:42.7.3.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
Hey's CIM Ref.:19.8.16

19 : Phosphates
8 : Phosphates of Al and other metals
mindat.org URL:http://www.mindat.org/min-1147.html
Please feel free to link to this page.

Type Occurrence of Crandallite

Type Locality:Brooklyn Mine, Silver City, Tintic District, East Tintic Mts, Juab Co., Utah, USA
Year of Discovery:1917
Geological Setting of type material:Cavities in a quartz-baryte aggregate
Associated Minerals at type locality:
QuartzBaryte

Physical Properties of Crandallite

Lustre:Vitreous, Dull
Comment:Massive material grades from vitreous to dull and chalky.
Colour:Yellow, white, grey; colourless in transmitted light.
Hardness (Mohs):5
Cleavage:Perfect
On {0001}, perfect.
Density (measured):2.78 - 2.92 g/cm3

Crystallography of Crandallite

Crystal System:Trigonal
Cell Parameters:a = 7Å, c = 16.19Å
Ratio:a:c = 1 : 2.313
Unit Cell Volume:V 687.03 ų (Calculated from Unit Cell)
Morphology:Crystals rare, minute, as trigonal prisms terminated by {0001}; as rosettes of fibers elongated perpendicular to [0001]. Commonly massive, nodular aggregates having concentric layering with layers comprised of sub-parallel or matted fibers. May be fine-granular and grading to a dense, agate-like or chalcedonic forms; also as banded spherules with a radial-fibrous structure.

Optical Data of Crandallite

Type:Uniaxial (+)
RI values: nω = 1.618 nε = 1.623
Maximum Birefringence:δ = 0.005

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Crandallite

Formula:
CaAl
 
3
[(OH)
 
5
|(PO
 
4
)
 
2
] · H
 
2
O
Essential elements:Al, Ca, H, O, P
All elements listed in formula:Al, Ca, H, O, P
Common Impurities:Sr,Ba,Fe

Relationship of Crandallite to other Species

Series:Forms a series with Goyazite (see here)
Member of Group:
Alunite Supergroup:
A
1+
 
B
3
3
(SO
 
4
)
 
2
(OH)
 
6
Crandallite Subgroup:
Related Minerals - Nickel-Strunz Grouping):

- +
8.BL.05Beudantite
PbFe
 
3
[(OH)
 
6
|SO
 
4
|AsO
 
4
]
8.BL.05Corkite
PbFe
 
3
[(OH)
 
6
|SO
 
4
|PO
 
4
]
8.BL.05Hidalgoite
PbAl
 
3
[(OH)
 
6
|SO
 
4
|AsO
 
4
]
8.BL.05Hinsdalite
PbAl
 
3
[(OH)
 
6
|SO
 
4
|PO
 
4
]
8.BL.05Kemmlitzite
(Sr,Ce)Al
 
3
[(OH)
 
6
|SO
 
4
|AsO
 
4
]
8.BL.05Orpheite
PbAl
 
3
[(OH)
 
6
|(PO
 
4
,SO
 
4
)
 
2
] (?)
8.BL.05Svanbergite
SrAl
 
3
[(OH)
 
6
|SO
 
4
|PO
 
4
]
8.BL.05Weilerite
8.BL.05Woodhouseite
CaAl
 
3
[(OH)
 
6
|SO
 
4
|PO
 
4
]
8.BL.05Gallobeudantite
PbGa
 
3
[(OH)
 
6
|SO
 
4
|AsO
 
4
]
8.BL.10Arsenogoyazite
SrAl
 
3
[(OH)
 
5
|(AsO
 
4
)
 
2
] · H
 
2
O
8.BL.10Arsenogorceixite
BaAl
 
3
[(OH)
 
5
|(AsO
 
4
)
 
2
] · H
 
2
O
8.BL.10Arsenocrandallite
(Ca,Sr)Al
 
3
[(OH)
 
5
|(AsO
 
4
,PO
 
4
)
 
2
] · H
 
2
O
8.BL.10Benauite
SrFe
3+
3
[(OH)
 
6
|(HPO
 
4
,PO
 
4
)|(PO
 
4
,SO
 
4
)]
8.BL.10Dussertite
BaFe
3+
3
[(OH)
 
5
|(AsO
 
4
)
 
2
]
8.BL.10Eylettersite
(Th,Pb)Al
 
3
[(OH)
 
6
|(PO
 
4
,SiO
 
4
)
 
2
] ?
8.BL.10Gorceixite
BaAl
 
3
[(OH)
 
5
|(PO
 
4
)
 
2
] · H
 
2
O
8.BL.10Goyazite
SrAl
 
3
[(OH)
 
5
|(PO
 
4
)
 
2
] · H
 
2
O
8.BL.10Kintoreite
PbFe
3+
3
[(OH,H
 
2
O)
 
6
|(PO
 
4
)
 
2
]
8.BL.10Philipsbornite
PbAl
 
3
[(OH)
 
5
|(AsO
 
4
)
 
2
] · H
 
2
O
8.BL.10Plumbogummite
PbAl
 
3
[(OH)
 
5
|(PO
 
4
)
 
2
] · H
 
2
O
8.BL.10Segnitite
PbFe
3+
3
[(OH,H
 
2
O)
 
6
|(AsO
 
4
)
 
2
]
8.BL.10Springcreekite
BaV
3+
3
[(OH,H
 
2
O)
 
6
|(PO
 
4
)
 
2
]
8.BL.13Arsenoflorencite-(La)
LaAl
 
3
[(OH)
 
6
|(AsO
 
4
)
 
2
]
8.BL.13Arsenoflorencite-(Nd)
NdAl
 
3
[(OH)
 
6
|(AsO
 
4
)
 
2
]
8.BL.13Arsenoflorencite-(Ce)
CeAl
 
3
[(OH)
 
6
|(AsO
 
4
)
 
2
]
8.BL.13Florencite-(Ce)
CeAl
 
3
[(OH)
 
6
|(PO
 
4
)
 
2
]
8.BL.13Florencite-(La)
LaAl
 
3
[(OH)
 
6
|(PO
 
4
)
 
2
]
8.BL.13Florencite-(Nd)
NdAl
 
3
[(OH)
 
6
|(PO
 
4
)
 
2
]
8.BL.13Waylandite
(Bi,Ca)Al
 
3
[(OH)
 
6
|(PO
 
4
,SiO
 
4
)
 
2
]
8.BL.13Zaïrite
Bi(Fe
3+
 
,Al)
 
3
[(OH)
 
6
|(PO
 
4
)
 
2
]
8.BL.13Arsenowaylandite
BiAl
 
3
(AsO
 
4
)
 
2
(OH)
 
6
8.BL.13Graulichite-(Ce)
CeFe
3+
3
[(OH)
 
6
|(AsO
 
4
)
 
2
]
8.BL.15Viitaniemiite
Na(Ca,Mn
2+
 
)Al[(F,OH)
 
3
|PO
 
4
]
8.BL.25Pattersonite
PbFe
3+
3
(PO
 
4
)
 
2
(OH)
 
4
{(H
 
2
O)
 
0.5
(OH)
 
0.5
}
 
2
Related Minerals - Hey's Index Grouping:

- +
19.8.1Montebrasite
LiAl[(OH,F)|PO
 
4
]
19.8.2Brazilianite
NaAl
 
3
[(OH)
 
2
|PO
 
4
]
 
2
19.8.3Wardite
NaAl
 
3
[(OH)
 
2
|PO
 
4
]
 
2
 · 2H
 
2
O
19.8.4Tancoite
LiNa
 
2
Al[OH|HPO
 
4
|PO
 
4
]
19.8.5Bertossaite
(Li,Na)
 
2
(Ca,Fe
2+
 
,Mn
2+
 
)Al
 
4
[(OH,F)|PO
 
4
]
 
4
19.8.6Tinsleyite
KAl
 
2
[OH|(PO
 
4
)
 
2
] · 2H
 
2
O
19.8.7Taranakite
(K,NH
 
4
)Al
 
3
(PO
 
4
)
 
3
OH·9H
 
2
O
19.8.8Francoanellite
K
 
3
Al
 
5
[(HPO
 
4
)
 
3
|PO
 
4
]
 
2
 · 12H
 
2
O
19.8.9Gordonite
MgAl
 
2
[OH|PO
 
4
]
 
2
 · 8H
 
2
O
19.8.10Aldermanite
Mg
 
5
Al
 
12
[(OH)
 
11
|(PO
 
4
)
 
4
]
 
2
 · 32H
 
2
O
19.8.11Overite
CaMgAl[OH|(PO
 
4
)
 
2
] · 4H
 
2
O
19.8.12Montgomeryite
Ca
 
4
MgAl
 
4
[(OH)
 
2
|(PO
 
4
)
 
3
]
 
2
 · 12H
 
2
O
19.8.14Foggite
CaAl[(OH)
 
2
|PO
 
4
] · H
 
2
O
19.8.15Gatumbaite
CaAl
 
2
[OH|PO
 
4
]
 
2
 · H
 
2
O
19.8.17Matulaite
CaAl
 
18
[(OH)
 
5
|(PO
 
4
)
 
3
]
 
4
 · 28H
 
2
O
19.8.19Lehiite
19.8.20Millisite
(Na,K)CaAl
 
6
[(OH)
 
9
|(PO
 
4
)
 
4
] · 3H
 
2
O
19.8.21Englishite
K
 
3
Na
 
2
Ca
 
10
Al
 
15
[OH|(PO
 
4
)
 
3
]
 
7
 · 26H
 
2
O
19.8.22Kleemanite
ZnAl
 
2
[OH|PO
 
4
]
 
2
 · 3H
 
2
O
19.8.23Mantienneite
KMg
 
2
Al
 
2
Ti[(OH)
 
3
|(PO
 
4
)
 
4
] · 15H
 
2
O
19.8.24Paulkerrite
K(Mg,Mn
2+
 
)
 
2
(Fe
3+
 
,Al,Ti,Mg)
 
2
Ti(PO
 
4
)
 
4
(OH)
 
3
 · 15H
 
2
O

Other Names for Crandallite

Synonyms:
Calcio-wavelliteLehiiteLime-wavellitePseudowavellite
Other Languages:
German:Crandallit
Kalkwavellit
Russian:Крандаллит
Spanish:Crandallita
Varieties:
Strontian Crandallite

Other Information

Other Information:Soluble with difficulty in acids.

May be pseudomorphic after Gordonite.
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 Crandallite

Reference List:Kosmann (1869) Zeitschrift der Deutsche geologische Gesellschaft, Berlin: 21: 799 (as Kalkwavellit).

Loughlin and Schaller (1917) American Journal of Science: 43: 69.

Laubmann (1922) Berichte deutsche chemische Gesellschaft: 55B: 3016 (as Pseudowavellite).

Laubmann (1922) Geognost. Jahrehefte, München: 35: 203.

Larsen and Shannon (1930a) American Mineralogist: 15: 303.

Larsen and Shannon (1930b) American Mineralogist: 15: 307.

Larsen (1942) American Mineralogist: 27: 288.

Gordon (1944) Proceedings of the Academy of Science, Philadelphia: 96: 336.

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. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 835.

American Mineralogist (1974): 59: 41-47.

Internet Links for Crandallite

Search Engines:
  • Look for Crandallite on Google
  • Look for Crandallite images on Google
    • External Links:
  • Look for Crandallite on Webmineral
  • Look for Crandallite on Athena Mineralogy
  • Look for Crandallite on Wikipedia
  • Look for Crandallite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Crandallite in the Natural History Museum (London) online catalogue
  • Crandallite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • SpiriferMinerals.com - high quality specimens
  • Edwards Minerals - Fine Specimens
  • Wendel Minerals - Auktion & Shop
  • Buy minerals from Mineralium.com
  • The Arkenstone - Fine Minerals
  • Buy fine minerals and gemstones from Pala International
  • rare and unusual minerals mainly crystallized
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Fabre Minerals - search for Crandallite specimens
  • Buy Fine Minerals from mineralsweb.com
  • High-end worldwide specimens & outstanding customer service
  • Buy Minerals and Crystals from Crystalarium.com
    • Jobs:
  • Mining & Geology Jobs

    • Page Sponsor

    Sponsorship:This page is currently not sponsored. Click here to sponsor this page.

    Localities for Crandallite

    Show Locality List (214 Items)
    The 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.
    Mineral and/or Locality
    Google
     
    www.mindat.org Web
    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 19th Nov 2009 19:34:58