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Arsenocrandallite

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Formula:
CaAl
 
3
(AsO
 
4
)
 
2
(OH)
 
5
· H
 
2
O
System:TrigonalColour:White, creamy ...
Lustre:Sub-Vitreous, Resinous, Waxy, DullHardness:
Member of:Dussertite Group > Alunite Supergroup
Name:Named by Kurt Walenta in 1981 in allusion to its composition as the ARSENate analogue of Crandallite.


The arsenate analogue of Crandallite.

Classification of Arsenocrandallite

IMA status:Approved
Strunz 8th edition ID:7/B.36-20
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 7th edition ID:42.7.4.1
Dana 8th edition ID:42.7.4.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
Hey's CIM Ref.:20.4.6

20 : Arsenates (also arsenates with phosphate, but without other anions)
4 : Arsenates of Group III metals (Al, rare earths)
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Type Occurrence of Arsenocrandallite

Type Locality:Neubulach, Calw, Black Forest, Baden-Württemberg, Germany
Place of Conservation of Type Material:Smithsonian Institution
Year of Discovery:1981
Geological Setting of type material:Oxidized veins in a polymetallic hydrothermal deposit
Associated Minerals at type locality:
Tennantite-Tetrahedrite SeriesQuartzMansfielditeMansfielditeMalachite
GoethiteChalcophylliteBulachiteBrochantiteBaryte
BariopharmacosideriteAzuriteArseniosiderite

Occurrences of Arsenocrandallite

Geological Setting:Secondary oxidation zone

Physical Properties of Arsenocrandallite

Lustre:Sub-Vitreous, Resinous, Waxy, Dull
Diaphaneity (Transparency):Transparent, Translucent
Comment:Originally erroneously described as "vitreous"
Colour:White, creamy yellowish-white, also blue to bluish-green
Streak:white
Hardness (Mohs):
Tenacity:Brittle
Cleavage:None Observed
Probably has a perfect cleavage as in other members of the group, but not observed because of small grain size.
Density (measured):3.25(1) g/cm3
Density (calculated):3.30 g/cm3

Crystallography of Arsenocrandallite

Crystal System:Trigonal
Class (H-M):3m (3 2/m) - Hexagonal Scalenohedral
Cell Parameters:a = 7.08Å, c = 17.27Å
Ratio:a:c = 1 : 2.439
Unit Cell Volume:V 749.70 ų (Calculated from Unit Cell)
Z:3
Morphology:Spherulitic aggregates, reniform crusts. Minute somewhat spiky crystals in small dense crusts.
Comment:Possible 3m space group
X-Ray Powder Diffraction:
d-spacingIntensity
5.84 (80)
5.02 (30)
3.55 (90)
2.99 (100)
2.23 (40)
1.919 (50)
1.769 (60)

Optical Data of Arsenocrandallite

Type:Uniaxial
RI values: n = 1.625
Birefringence:0.000
Maximum Birefringence:δ = 0.000

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:Mean n = 1.625. The mineral is isotropic or very weakly birefringent.
Pleochroism:Non-pleochroic

Chemical Properties of Arsenocrandallite

Formula:
CaAl
 
3
(AsO
 
4
)
 
2
(OH)
 
5
· H
 
2
O
Simplified for copy/paste:CaAl3(AsO4)2(OH)5·H2O
Essential elements:Al, As, Ca, H, O
All elements listed in formula:Al, As, Ca, H, O

Relationship of Arsenocrandallite to other Species

Member of:Dussertite Group > Alunite Supergroup
Other Members of Group:

- +
Arsenoflorencite-(Ce)
CeAl
 
3
(AsO
 
4
)
 
2
(OH)
 
6
Arsenoflorencite-(La)
(La,Ce,Nd)(Al,Fe
3+
 
)
 
3
(AsO
 
4
,PO
 
4
)
 
2
(OH)
 
6
Arsenoflorencite-(Nd)
NdAl
 
3
(AsO
 
4
)
 
2
(OH)
 
6
Arsenogorceixite
BaAl
 
3
(AsO
 
4
)
 
2
(OH)
 
5
· H
 
2
O
Arsenogoyazite
SrAl
 
3
(AsO
 
4
)
 
2
(OH)
 
5
· H
 
2
O
Arsenowaylandite
BiAl
 
3
(AsO
 
4
)
 
2
(OH)
 
6
Dussertite
BaFe
3+
3
(AsO
 
4
)
 
2
(OH)
 
5
Graulichite-(Ce)
CeFe
3+
3
(AsO
 
4
)
 
2
(OH)
 
6
Philipsbornite
PbAl
 
3
(AsO
 
4
)
 
2
(OH)
 
5
· H
 
2
O
Segnitite
PbFe
3+
3
(AsO
 
4
)
 
2
(OH,H
 
2
O)
 
6
Related Minerals - Nickel-Strunz Grouping):

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

- +
20.4.1Mansfieldite
AlAsO
 
4
· 2H
 
2
O
20.4.2Bulachite
Al
 
2
(AsO
 
4
)(OH)
 
3
· 3H
 
2
O
20.4.3Pharmacoalumite
KAl
 
4
(AsO
 
4
)
 
3
(OH)
 
4
· 6.5H
 
2
O
20.4.4Luetheite
Cu
 
2
Al
 
2
(AsO
 
4
)
 
2
(OH)
 
4
20.4.5Arsenogoyazite
SrAl
 
3
(AsO
 
4
)
 
2
(OH)
 
5
· H
 
2
O
20.4.7Arsenoflorencite-(Ce)
CeAl
 
3
(AsO
 
4
)
 
2
(OH)
 
6
20.4.8Arsenoflorencite-(La)
(La,Ce,Nd)(Al,Fe
3+
 
)
 
3
(AsO
 
4
,PO
 
4
)
 
2
(OH)
 
6
20.4.9Arsenoflorencite-(Nd)
NdAl
 
3
(AsO
 
4
)
 
2
(OH)
 
6
20.4.10Gerdtremmelite
(Zn,Fe)(Al,Fe)
 
2
(AsO
 
4
)(OH)
 
5
20.4.11Gasparite-(Ce)
(Ce,REE)(AsO
 
4
)
20.4.12Chernovite-(Y)
Y(AsO
 
4
)
20.4.13Agardite-(Y)
(Y,Ca)Cu
 
6
(AsO
 
4
)
 
2
(AsO
 
4
,HAsO
 
4
)(OH)
 
6
· 3H
 
2
O
20.4.14Agardite-(La)
(La,Ce)Cu
 
6
(AsO
 
4
)
 
3
(OH)
 
6
· 3H
 
2
O
20.4.15Goudeyite
(Al,Y)Cu
 
6
(AsO
 
4
)
 
3
(OH)
 
6
· 3H
 
2
O
20.4.16Retzian-(Ce)
Mn
2+
2
Ce(AsO
 
4
)(OH)
 
4
20.4.17Retzian-(La)
(Mn
2+
 
,Mg)
 
2
(La,Ce,Nd)(AsO
 
4
)(OH)
 
4
20.4.18Retzian-(Nd)
Mn
2+
2
(Nd,Ce,La)(AsO
 
4
)(OH)
 
4
Related Minerals - Dana Grouping):

- +
42.7.4.1Wavellite
Al
 
3
(PO
 
4
)
 
2
(OH,F)
 
3
· 5H
 
2
O
42.7.4.5Arsenogorceixite
BaAl
 
3
(AsO
 
4
)
 
2
(OH)
 
5
· H
 
2
O
42.7.4.6Benauite
SrFe
3+
3
(HPO
 
4
,PO
 
4
)
 
2
(OH)
 
6

Other Names for Arsenocrandallite

Synonyms:
IMA1980-060
Other Languages:
German:Arsenocrandallit
Spanish:Arsenocrandallita

Other Information

Fluorescence in UV light:Not fluorescent in UV
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 Arsenocrandallite

Reference List:

- +
Walenta, K. (1981) Mineralien der Beudantit-Crandallitgruppe aus dem Schwarzwald: Arsenocrandallit und sulfatfreier Weilerit. Schweizerische mineralogische und petrographische Mitteilungen: 61, 23-35. (in German).

American Mineralogist: 67: 854.

Internet Links for Arsenocrandallite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Arsenocrandallite details from Handbook of Mineralogy (PDF)
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  • Localities for Arsenocrandallite

    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.
    (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.
    Belgium
     
    • Luxembourg Province
      • Stavelot Massif
        • Vielsalm
          • Grand Halleux
    Loeber, A. (2005). "La carrière de Hourt, Grand Halleux, Province de Luxembourg, Belgique." Magazine du 4M, 26(255), 5-7; Dehove, J. and Hubert, F. (2006). "Nouvelles découvertes à Hourt." Magazine du 4M, 27(263), 9-11.
    France
     
    • Provence-Alpes-Côte d'Azur
      • Var
        • Le Pradet
    http://www.mine-capgaronne.fr/site/Mineraux/ListeMineraux.html
    Georges FAVREAU collection
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Calw
    American Mineralogist: 67: 854.; American Mineralogist: 70: 214
        • Wolfach
          • Oberwolfach
            • Rankach valley
    Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German)
    • Saxony
      • Erzgebirge
        • Marienberg District
          • Lauta
    Hajek, W. (2010): Kristallwelten Marienberg. Weise Verlag, München.
    Greece
     
    • Attikí Prefecture (Attica; Attika)
      • Lavrion District (Laurion; Laurium)
        • Lavrion District Mines
          • Agios Konstantinos [St Constantine] (Kamariza)
            • Kamariza Mines (Kamareza Mines)
    No reference listed
    GRÖBNER, J. (2001): Roter Skorodit und weitere ungewöhnliche Arsenate: Die Mineralien des Abbaus 132 der Grube Christiana, Lavrion/Griechenland. Lapis, 26 (11), 13-21.
              • Hilarion area
    Fritz Schreiber collection
          • Elafos area
    Lapis, 24, 7/8 (1999)
    • Macedonia Department
      • Serres Prefecture
        • Alistrati
    Seemann, R., Niedermayr, G. & Brandstätter, F. (2008): Mineralien aus dem Eisen- und Farberdebergbau von Livadista bei Alistrati. Mineralien-Welt 19 (2), 34-54.
    Norway
     
    • Nordland
      • Sørfold
    Husdal, T. (2008): The minerals of the pegmatites within the Tysfjord granite, northern Norway. Norsk Bergverksmuseum, skrift 38, 5-28.
    Spain
     
    • Murcia
      • Mazarrón-Águilas
        • Pastrana
    Jordi Fabre
    USA
     
    • Utah
      • Juab Co.
        • East Tintic Mts
          • Tintic District
            • Eureka
    Anthony, Bideaux, Bladh, Nichols: Handbook of Mineralogy, Vol. IV
    Mineral and/or Locality  
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