Arsenogoyazite
A valid IMA mineral species
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About Arsenogoyazite
Formula:
SrAl3(AsO4)(AsO3OH)(OH)6
Colour:
White to colorless, pale yellow, pale green, grayish-green
Lustre:
Sub-Vitreous, Resinous, Waxy, Greasy, Dull
Hardness:
4
Specific Gravity:
3.355
Crystal System:
Trigonal
Member of:
Name:
Named by Kurt Walenta and Pete J. Dunn in 1984 in allusion to its composition, being the ARSENate analogue of goyazite.
The strontium analogue of philipsbornite and arsenocrandallite, and the arsenate analogue of goyazite.
Unique Identifiers
Mindat ID:
292
Long-form identifier:
mindat:1:1:292:5
IMA Classification of Arsenogoyazite
Approved
IMA Formula:
SrAl3(As5+O4)(As5+O3OH)(OH)6
Approval year:
1983
First published:
1984
Classification of Arsenogoyazite
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
42.7.4.3
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
20.4.5
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.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Agoy | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Arsenogoyazite
Sub-Vitreous, Resinous, Waxy, Greasy, Dull
Transparency:
Transparent, Translucent
Colour:
White to colorless, pale yellow, pale green, grayish-green
Streak:
White
Hardness:
4 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Probably perfect {0001} as in other members of the group
Probably perfect {0001} as in other members of the group
Fracture:
Conchoidal
Density:
3.355 g/cm3 (Measured) 3.33 g/cm3 (Calculated)
Optical Data of Arsenogoyazite
Type:
Uniaxial (-)
RI values:
nα = 1.643 nβ = 1.643 nω = 1.698 nε = 1.688
Birefringence:
0.000
Max. Birefringence:
δ = 0.010
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Optical Extinction:
Parallel. It is not certain that the higher refractive indices were measured on true arsenogoyazite.
Pleochroism:
Non-pleochroic
Chemistry of Arsenogoyazite
Mindat Formula:
SrAl3(AsO4)(AsO3OH)(OH)6
Element Weights:
Crystallography of Arsenogoyazite
Crystal System:
Trigonal
Class (H-M):
3m(32/m) - Hexagonal Scalenohedral
Space Group:
R3m
Cell Parameters:
a = 7.10 Å, c = 17.16 Å
Ratio:
a:c = 1 : 2.417
Unit Cell V:
749.14 ų (Calculated from Unit Cell)
Z:
3
Morphology:
Rhombohedral to platy
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.84 Å | (70) |
| 3.56 Å | (80) |
| 3.03 Å | (100) |
| 2.31 Å | (40) |
| 2.27 Å | (40) |
| 1.933 Å | (50) |
| 1.777 Å | (40) |
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] | |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 48 : Soil leaching zone minerals | <0.6 |
Type Occurrence of Arsenogoyazite
General Appearance of Type Material:
Aggregates and crusts of pale green to white minute rhombohedral crystals.
Place of Conservation of Type Material:
University of Stuttgart, Stuttgart, Germany.
National Museum of Natural History, Washington, D.C., USA, 150232.
National Museum of Natural History, Washington, D.C., USA, 150232.
Geological Setting of Type Material:
Oxidized veins of a hydrothermal polymetallic deposit.
Associated Minerals at Type Locality:
Synonyms of Arsenogoyazite
Other Language Names for Arsenogoyazite
Dutch:Arsenogoyaziet
French:Arsénogoyazite
German:Arsenogoyazit
Norwegian:Arsenogoyazitt
Russian:Арсеногойяцит
Spanish:Arsenogoyazita
Relationship of Arsenogoyazite to other Species
Member of:
Other Members of Dussertite Group:
| Arsenocrandallite | CaAl3(AsO4)(AsO3OH)(OH)6 | Trig. 3m(32/m) |
| Arsenoflorencite-(Ce) | CeAl3(AsO4)2(OH)6 | Trig. 3m(32/m) : R3m |
| Arsenoflorencite-(La) | LaAl3(AsO4)2(OH)6 | Trig. 3m(32/m) : R3m |
| 'Arsenoflorencite-(Nd)' | NdAl3(AsO4)2(OH)6 | Trig. |
| Arsenogorceixite | BaAl3(AsO4)(AsO3OH)(OH)6 | Trig. 3m(32/m) : R3m |
| 'Arsenowaylandite' | BiAl3(AsO4)2(OH)6 | Trig. |
| Dussertite | BaFe3+3(AsO4)(AsO3OH)(OH)6 | Trig. 3m(32/m) : R3m |
| Graulichite-(Ce) | CeFe3+3(AsO4)2(OH)6 | Trig. 3m(32/m) : R3m |
| Graulichite-(La) | LaFe3+3(AsO4)2(OH)6 | Trig. 3m(32/m) : R3m |
| Karlseifertite | Pb(Ga2Ge)(AsO4)2(OH)6 | Trig. 3m(32/m) : R3m |
| Philipsbornite | PbAl3(AsO4)(AsO3OH)(OH)6 | Trig. 3m(32/m) : R3m |
| Segnitite | PbFe3+3AsO4(AsO3OH)(OH)6 | Trig. 3m(32/m) : R3m |
Forms a series with:
Common Associates
Associations Based on Photo Data:
| 5 photos of Arsenogoyazite associated with Conichalcite | CaCu(AsO4)(OH) |
| 4 photos of Arsenogoyazite associated with Arseniopleite | NaCaMnMn2(AsO4)3 |
| 4 photos of Arsenogoyazite associated with Olivenite | Cu2(AsO4)(OH) |
| 4 photos of Arsenogoyazite associated with Quartz | SiO2 |
| 3 photos of Arsenogoyazite associated with Cobaltarthurite | CoFe3+2(AsO4)2(OH)2 · 4H2O |
| 3 photos of Arsenogoyazite associated with Arseniosiderite | Ca2Fe3+3(AsO4)3O2 · 3H2O |
| 2 photos of Arsenogoyazite associated with Adamite | Zn2(AsO4)(OH) |
| 2 photos of Arsenogoyazite associated with Azurite | Cu3(CO3)2(OH)2 |
| 2 photos of Arsenogoyazite associated with 'Copper-bearing Adamite' | (Zn,Cu)2AsO4OH |
| 2 photos of Arsenogoyazite associated with Yukonite | Ca3Fe3+(AsO4)2(OH)3 · 5H2O |
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. | Arsenobenauite | SrFe3+3(AsO4)(AsO3OH)(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 | 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 | Arsenocrandallite | CaAl3(AsO4)(AsO3OH)(OH)6 |
| 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 Arsenogoyazite
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 Arsenogoyazite
mindat.org URL:
https://www.mindat.org/min-292.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Arsenogoyazite
Localities for Arsenogoyazite
Showing 28 localities.
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.
Austria | |
| Kolitsch et al. (2025) |
| Bernhard et al. (2010) |
Belgium | |
| Blondieau et al. (2017) |
China | |
| Rubo Zhang et al. (1987) | |
Czech Republic | |
| Scharm +7 other references |
France | |
| Pélisson (1989) |
| |
| Gourault et al. (2021) |
| Kuntz et al. (2025) |
Germany (TL) | |
| Walenta et al. (1984) +2 other references |
| SEM-EDS by Joy Desor and Gerhard Möhn |
| Gerhard Möhn Collection. Identified by ... |
| Gröbner et al. (2011) |
Greece | |
| Chukanov et al. (2007) |
| Schneider V. (2001) | |
| |
| Gröbner (2001) | |
Italy | |
| Armellino et al. (2019) |
Namibia | |
| Keller et al. (1986) +1 other reference |
Spain | |
| C. MENOR-SALVÁN (2012) |
| Calvo Rebollar et al. (2022) |
| Borja Sainz de Baranda et al. (2003) |
Switzerland | |
| Uwe Kolitsch (unpublished crystal-structure refinement, confirmed by SEM-EDS analyses) +2 other references |
UK | |
| Lapis 33 (2) |
| Belson et al. (2005) |
USA | |
| R&M 77:5 p298-305 +1 other reference |
| |
| Anthony et al. (2000) |
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Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany