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Arsenocrandallite

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Formula:
CaAl3(AsO4)2(OH)5 · H2O
System:
Trigonal
Colour:
White, creamy ...
Lustre:
Sub-Vitreous, Resinous, Waxy, Dull
Hardness:
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

Approved
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 ed.:
42.7.4.1
42.7.4.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
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

Place of Conservation of Type Material:
Smithsonian Institution
Year of Discovery:
1981
Geological Setting of Type Material:
Oxidized veins in a polymetallic hydrothermal deposit

Occurrences of Arsenocrandallite

Geological Setting:
Secondary oxidation zone

Physical Properties of Arsenocrandallite

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:
3.25(1) g/cm3 (Measured)    3.30 g/cm3 (Calculated)

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 Data:
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
Max Birefringence:
δ = 0.000
Image 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:
CaAl3(AsO4)2(OH)5 · H2O
Essential elements:
All elements listed in formula:

Relationship of Arsenocrandallite to other Species

Other Members of Group:
Arsenoflorencite-(Ce)CeAl3(AsO4)2(OH)6
Arsenoflorencite-(La)LaAl3(AsO4)2(OH)6
Arsenoflorencite-(Nd)NdAl3(AsO4)2(OH)6
ArsenogorceixiteBaAl3(AsO4)2(OH)5 · H2O
ArsenogoyaziteSrAl3(AsO4)2(OH)5 · H2O
ArsenowaylanditeBiAl3(AsO4)2(OH)6
DussertiteBaFe33+(AsO4)2(OH)5
Graulichite-(Ce)CeFe33+(AsO4)2(OH)6
PhilipsbornitePbAl3(AsO4)2(OH)5 · H2O
SegnititePbFe33+(AsO4)2(OH,H2O)6
8.BL.05BeudantitePbFe3(AsO4)(SO4)(OH)6
8.BL.05CorkitePbFe3(PO4)(SO4)(OH)6
8.BL.05HidalgoitePbAl3(AsO4)(SO4)(OH)6
8.BL.05HinsdalitePbAl3(PO4)(SO4)(OH)6
8.BL.05KemmlitziteSrAl3(AsO4)(SO4)(OH)6
8.BL.05SvanbergiteSrAl3(PO4)(SO4)(OH)6
8.BL.05WoodhouseiteCaAl3(PO4)(SO4)(OH)6
8.BL.05GallobeudantitePbGa3(AsO4)(SO4)(OH)6
8.BL.10ArsenogoyaziteSrAl3(AsO4)2(OH)5 · H2O
8.BL.10ArsenogorceixiteBaAl3(AsO4)2(OH)5 · H2O
8.BL.10BenauiteSrFe33+(HPO4,PO4)2(OH)6
8.BL.10CrandalliteCaAl3(PO4)2(OH)5 · H2O
8.BL.10DussertiteBaFe33+(AsO4)2(OH)5
8.BL.10EylettersiteTh0.75Al3(PO4)2(OH)6
8.BL.10GorceixiteBaAl3(PO4)2(OH)5 · H2O
8.BL.10GoyaziteSrAl3(PO4)2(OH)5 · H2O
8.BL.10KintoreitePbFe3(PO4)(PO3OH)(OH)6
8.BL.10PhilipsbornitePbAl3(AsO4)2(OH)5 · H2O
8.BL.10PlumbogummitePbAl3(PO4)2(OH)5 · H2O
8.BL.10SegnititePbFe33+(AsO4)2(OH,H2O)6
8.BL.10SpringcreekiteBaV33+(PO4)2(OH,H2O)6
8.BL.13Arsenoflorencite-(La)LaAl3(AsO4)2(OH)6
8.BL.13Arsenoflorencite-(Nd)NdAl3(AsO4)2(OH)6
8.BL.13Arsenoflorencite-(Ce)CeAl3(AsO4)2(OH)6
8.BL.13Florencite-(Ce)CeAl3(PO4)2(OH)6
8.BL.13Florencite-(La)LaAl3(PO4)2(OH)6
8.BL.13Florencite-(Nd)(Nd,La,Ce)Al3(PO4)2(OH)6
8.BL.13WaylanditeBiAl3(PO4)2(OH)6
8.BL.13ZaïriteBiFe33+(PO4)2(OH)6
8.BL.13ArsenowaylanditeBiAl3(AsO4)2(OH)6
8.BL.13Graulichite-(Ce)CeFe33+(AsO4)2(OH)6
8.BL.13Florencite-(Sm)(Sm,Nd)Al3(PO4)2(OH)6
8.BL.15ViitaniemiiteNa(Ca,Mn2+)Al(PO4)(F,OH)3
8.BL.25PattersonitePbFe33+(PO4)2(OH)5 · H2O
20.4.1MansfielditeAlAsO4 · 2H2O
20.4.2BulachiteAl2(AsO4)(OH)3 · 3H2O
20.4.3PharmacoalumiteKAl4(AsO4)3(OH)4 · 6.5H2O
20.4.4LuetheiteCu2Al2(AsO4)2(OH)4
20.4.5ArsenogoyaziteSrAl3(AsO4)2(OH)5 · H2O
20.4.7Arsenoflorencite-(Ce)CeAl3(AsO4)2(OH)6
20.4.8Arsenoflorencite-(La)LaAl3(AsO4)2(OH)6
20.4.9Arsenoflorencite-(Nd)NdAl3(AsO4)2(OH)6
20.4.10Gerdtremmelite(Zn,Fe)(Al,Fe)2(AsO4)(OH)5
20.4.11Gasparite-(Ce)(Ce,REE)(AsO4)
20.4.12Chernovite-(Y)Y(AsO4)
20.4.13Agardite-(Y)YCu6(AsO4)3(OH)6 · 3H2O
20.4.14Agardite-(La)LaCu6(AsO4)3(OH)6 · 3H2O
20.4.15GoudeyiteAlCu6(AsO4)3(OH)6 · 3H2O
20.4.16Retzian-(Ce)Mn22+Ce(AsO4)(OH)4
20.4.17Retzian-(La)(Mn2+,Mg)2(La,Ce,Nd)(AsO4)(OH)4
20.4.18Retzian-(Nd)Mn22+(Nd,Ce,La)(AsO4)(OH)4
42.7.4.1WavelliteAl3(PO4)2(OH,F)3 · 5H2O
42.7.4.5ArsenogorceixiteBaAl3(AsO4)2(OH)5 · H2O
42.7.4.6BenauiteSrFe33+(HPO4,PO4)2(OH)6

Other Names for Arsenocrandallite

Name in Other Languages:

Other Information

Not fluorescent in UV
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 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

Localities for Arsenocrandallite

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.
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 (TL)
 
  • 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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