Arsenocrandallite
A valid IMA mineral species
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About Arsenocrandallite
Formula:
CaAl3(AsO4)(AsO3OH)(OH)6
Colour:
White, creamy yellowish-white, also blue to bluish-green
Lustre:
Sub-Vitreous, Resinous, Waxy, Dull
Hardness:
5½
Specific Gravity:
3.25
Crystal System:
Trigonal
Member of:
Name:
Named by Kurt Walenta in 1981 in allusion to its composition as the ARSENate analogue of Crandallite.
Unique Identifiers
Mindat ID:
365
Long-form identifier:
mindat:1:1:365:0
IMA Classification of Arsenocrandallite
Approved
First published:
1981
Classification of Arsenocrandallite
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
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
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)
20 : Arsenates (also arsenates with phosphate, but without other anions)
4 : Arsenates of Group III metals (Al, rare earths)
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Acdl | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Acr | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Arsenocrandallite
Sub-Vitreous, Resinous, Waxy, Dull
Transparency:
Transparent, Translucent
Comment:
Originally erroneously described as "vitreous"
Colour:
White, creamy yellowish-white, also blue to bluish-green
Streak:
White
Hardness:
5½ on Mohs scale
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.
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)
Optical Data of Arsenocrandallite
Type:
Uniaxial
RI values:
n = 1.625
Birefringence:
The mineral is isotropic or very weakly birefringent.
Max. Birefringence:
δ = 0.000
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Pleochroism:
Non-pleochroic
Comments:
Mean n = 1.625.
Chemistry of Arsenocrandallite
Mindat Formula:
CaAl3(AsO4)(AsO3OH)(OH)6
Element Weights:
Crystallography of Arsenocrandallite
Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Cell Parameters:
a = 7.08 Å, c = 17.27 Å
Ratio:
a:c = 1 : 2.439
Unit Cell 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
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.84 Å | (80) |
| 5.02 Å | (30) |
| 3.55 Å | (90) |
| 2.99 Å | (100) |
| 2.23 Å | (40) |
| 1.919 Å | (50) |
| 1.769 Å | (60) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Geological Setting:
Secondary oxidation zone
Type Occurrence of Arsenocrandallite
General Appearance of Type Material:
Reniform crusts and spherulitic aggregates up to 0.1 mm.
Place of Conservation of Type Material:
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 150251.
Geological Setting of Type Material:
Oxidized veins in a polymetallic hydrothermal deposit.
Associated Minerals at Type Locality:
Synonyms of Arsenocrandallite
Other Language Names for Arsenocrandallite
Relationship of Arsenocrandallite to other Species
Member of:
Other Members of Dussertite Group:
| Arsenoflorencite-(Ce) | CeAl3(AsO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
| Arsenoflorencite-(La) | LaAl3(AsO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
| Arsenoflorencite-(Nd) | NdAl3(AsO4)2(OH)6 | Trig. |
| Arsenogorceixite | BaAl3(AsO4)(AsO3OH)(OH)6 | Trig. 3m (3 2/m) : R3m |
| Arsenogoyazite | SrAl3(AsO4)(AsO3OH)(OH)6 | Trig. 3m (3 2/m) : R3m |
| Arsenowaylandite | BiAl3(AsO4)2(OH)6 | Trig. |
| Dussertite | BaFe3+3(AsO4)(AsO3OH)(OH)6 | Trig. 3m (3 2/m) : R3m |
| Graulichite-(Ce) | CeFe3+3(AsO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
| Graulichite-(La) | LaFe3+3(AsO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
| Karlseifertite | Pb(Ga2Ge)(AsO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
| Philipsbornite | PbAl3(AsO4)(AsO3OH)(OH)6 | Trig. 3m (3 2/m) : R3m |
| Segnitite | PbFe3+3AsO4(AsO3OH)(OH)6 | Trig. 3m (3 2/m) : R3m |
Common Associates
Associated Minerals Based on Photo Data:
| 35 photos of Arsenocrandallite associated with Conichalcite | CaCu(AsO4)(OH) |
| 21 photos of Arsenocrandallite associated with Olivenite | Cu2(AsO4)(OH) |
| 17 photos of Arsenocrandallite associated with Azurite | Cu3(CO3)2(OH)2 |
| 12 photos of Arsenocrandallite associated with Yukonite | Ca3Fe3+(AsO4)2(OH)3 · 5H2O |
| 6 photos of Arsenocrandallite associated with Lavendulan | NaCaCu5(AsO4)4Cl · 5H2O |
| 6 photos of Arsenocrandallite associated with Calcite | CaCO3 |
| 5 photos of Arsenocrandallite associated with Barahonaite-(Fe) | (Ca,Cu,Na,Fe3+,Al)12Fe3+2(AsO4)8(OH,Cl)x · nH2O |
| 5 photos of Arsenocrandallite associated with Cobaltarthurite | CoFe3+2(AsO4)2(OH)2 · 4H2O |
| 4 photos of Arsenocrandallite associated with Arseniosiderite | Ca2Fe3+3(AsO4)3O2 · 3H2O |
| 4 photos of Arsenocrandallite associated with Zincolivenite | CuZn(AsO4)(OH) |
Related Minerals - Strunz-mindat Grouping
| 8.BL. | Kiryuite | NaMnAl(PO4)F3 |
| 8.BL. | Metaheimite | PbCu2(AsO4)(OH)3 |
| 8.BL. | Graulichite-(La) | LaFe3+3(AsO4)2(OH)6 |
| 8.BL. | Cloudite | BaFe3+3(PO4)(SO4)(OH)6 |
| 8.BL. | Oberwolfachite | SrFe3+3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Gallobeudantite | PbGa3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Slottaite | SrFe3+3(PO4)(SO4)(OH)6 |
| 8.BL.05 | Corkite | PbFe3+3(PO4)(SO4)(OH)6 |
| 8.BL.05 | Hidalgoite | PbAl3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Hinsdalite | PbAl3(PO4)(SO4)(OH)6 |
| 8.BL.05 | UM2011-07-POSO:AlBaH | BaAl3(PO4)(SO4)(OH)6 |
| 8.BL.05 | Kemmlitzite | SrAl3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Beudantite | PbFe3+3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Weilerite | BaAl3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Woodhouseite | CaAl3(PO4)(SO4)(OH)6 |
| 8.BL.05 | Svanbergite | SrAl3(PO4)(SO4)(OH)6 |
| 8.BL.10 | Segnitite | PbFe3+3AsO4(AsO3OH)(OH)6 |
| 8.BL.10 | Arsenogoyazite | SrAl3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Arsenogorceixite | BaAl3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Dussertite | BaFe3+3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Galloplumbogummite | Pb(Ga,Al,Ge)3(PO4)2(OH)6 |
| 8.BL.10 | Stibiosegnitite | Pb(Fe3+2.5Sb5+0.5)(AsO4)2(OH)6 |
| 8.BL.10 va | Viséite | |
| 8.BL.10 | Benauite | SrFe3+3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Philipsbornite | PbAl3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Crandallite | CaAl3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Springcreekite | BaV3+3(PO4)2(OH,H2O)6 |
| 8.BL.10 | Eylettersite | Th0.75Al3(PO4)2(OH)6 |
| 8.BL.10 | Kintoreite | PbFe3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Plumbogummite | PbAl3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Gorceixite | BaAl3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Goyazite | SrAl3(PO4)(PO3OH)(OH)6 |
| 8.BL.13 | Florencite-(Ce) | CeAl3(PO4)2(OH)6 |
| 8.BL.13 | Florencite-(La) | LaAl3(PO4)2(OH)6 |
| 8.BL.13 | Florencite-(Nd) | NdAl3(PO4)2(OH)6 |
| 8.BL.13 | Zaïrite | BiFe3+3(PO4)2(OH)6 |
| 8.BL.13 | Arsenoflorencite-(La) | LaAl3(AsO4)2(OH)6 |
| 8.BL.13 | Arsenoflorencite-(Nd) | NdAl3(AsO4)2(OH)6 |
| 8.BL.13 | Unnamed (As-analogue of Zaïrite) | (Bi,Pb)Fe3+3(AsO4)2(OH)6 |
| 8.BL.13 | Arsenoflorencite-(Ce) | CeAl3(AsO4)2(OH)6 |
| 8.BL.13 | Graulichite-(Ce) | CeFe3+3(AsO4)2(OH)6 |
| 8.BL.13 | Arsenowaylandite | BiAl3(AsO4)2(OH)6 |
| 8.BL.13 | Waylandite | BiAl3(PO4)2(OH)6 |
| 8.BL.13 | Florencite-(Sm) | SmAl3(PO4)2(OH)6 |
| 8.BL.15 | Viitaniemiite | Na(Ca,Mn2+)Al(PO4)(F,OH)3 |
| 8.BL.25 | Pattersonite | PbFe3+3(PO4)2(OH)5 · H2O |
Fluorescence of Arsenocrandallite
Not fluorescent in UV
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Arsenocrandallite
mindat.org URL:
https://www.mindat.org/min-365.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
References for Arsenocrandallite
Localities for Arsenocrandallite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
France | |
| www.mine-capgaronne.fr (2003) +1 other reference |
| Favreau (n.d.) | |
Germany | |
| Walenta (1992) |
| American Mineralogist: 67: 854. +3 other references |
| Hajek (2010) |
Greece | |
| Fritz Schreiber collection |
| Chukanov et al. (2007) | |
| |
| Gröbner (2001) | |
| Lapis et al. (1999) |
| Kostas Tzanis collection (EDS analysis of a single aggregate on pharmacosiderite) |
| Seemann et al. (2008) |
Namibia | |
| Bowell et al. (2018) |
Norway | |
| Husdal (2008) |
Spain | |
| Georges FAVREAU collection & EDX ... |
| García Guirado (2016) |
| Calvo (2015) |
USA | |
| Anthony et al. (2000) |
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Lavrion Mining District, Lavreotiki, East Attica, Attica, Greece