Aerugite
A valid IMA mineral species - grandfathered
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About Aerugite
Formula:
Ni8.5(AsO4)2As5+O8
Colour:
Dark grass-green, blue-green, pale brown.
Lustre:
Sub-Adamantine, Sub-Vitreous, Resinous
Hardness:
4
Specific Gravity:
5.85
Crystal System:
Trigonal
Name:
Named by Gilbert-Joseph Adam in 1869 from 'aerugo', which means 'copper rust', alluding to its appearance.
Type Locality:
This page provides mineralogical data about Aerugite.
Unique Identifiers
Mindat ID:
36
Long-form identifier:
mindat:1:1:36:5
Similar Names
| Ehrigite | A valid IMA mineral species | Bi8Te3 |
IMA Classification of Aerugite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Ni2+8.5(As5+O4)2As5+O8
First published:
1858
Type description reference:
Classification of Aerugite
8.BC.15
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
C : With only medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
C : With only medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
41.3.11.
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
3 : (AB)3(XO4)Zq
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
3 : (AB)3(XO4)Zq
20.10.7
20 : Arsenates (also arsenates with phosphate, but without other anions)
10 : Arsenates of Co and Ni
20 : Arsenates (also arsenates with phosphate, but without other anions)
10 : Arsenates of Co and Ni
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 |
|---|---|---|
| Aru | 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 Aerugite
Sub-Adamantine, Sub-Vitreous, Resinous
Transparency:
Transparent
Colour:
Dark grass-green, blue-green, pale brown.
Streak:
Pale green, pale blue-green.
Hardness:
4 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Density:
5.85 g/cm3 (Measured) 5.772 g/cm3 (Calculated)
Chemistry of Aerugite
Mindat Formula:
Ni8.5(AsO4)2As5+O8
Element Weights:
Elements listed:
Crystallography of Aerugite
Crystal System:
Trigonal
Class (H-M):
3m(32/m) - Hexagonal Scalenohedral
Space Group:
R3m
Setting:
R3m
Cell Parameters:
a = 5.9511(5) Å, c = 27.5676(20) Å
Ratio:
a:c = 1 : 4.632
Unit Cell V:
845.52 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Fine-grained crystalline, massive, as crusts, to 2 mm thick.
Comment:
Formerly reported as isometric.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0009828 | Aerugite | Fleet M E, Barbier J (1989) Structure of aerugite (Ni8.5As3O16) and interrelated arsenate and germanate structural series Acta Crystallographica B45 201-205 |  | 1989 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.19 Å | (60) |
| 5.05 Å | (60) |
| 3.76 Å | (80) |
| 2.86 Å | (60) |
| 2.49 Å | (60) |
| 2.33 Å | (70) |
| 1.06 Å | (100) |
| 1.485 Å | (30) |
Comments:
ICDD 18-873
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Geological Setting:
A rare secondary mineral in hydrothermal Ni–As–U ore deposits.
Type Occurrence of Aerugite
Place of Conservation of Type Material:
Natural History Museum, London, England, 32590 and 1907,103.
Geological Setting of Type Material:
Oxidised vein in a nickel arsenic deposit.
Associated Minerals at Type Locality:
Other Language Names for Aerugite
Common Associates
Associations Based on Photo Data:
| 5 photos of Aerugite associated with Xanthiosite | Ni3(AsO4)2 |
| 1 photo of Aerugite associated with Petewilliamsite | (Ni,Co)30(As2O7)15 |
| 1 photo of Aerugite associated with Niasite | Ni2+4.5(AsO4)3 |
| 1 photo of Aerugite associated with Johanngeorgenstadtite | Ni2+4.5(AsO4)3 |
| 1 photo of Aerugite associated with Paganoite | NiBi(AsO4)O |
Related Minerals - Strunz-mindat Grouping
| 8.BC. | Manganrockbridgeite | Mn2+2Fe3+3(PO4)3(OH)4(H2O) |
| 8.BC. | Elaliite | (Fe2+8Fe3+)(PO4)O8 |
| 8.BC. | Elkinstantonite | Fe4(PO4)2O |
| 8.BC.05 | Leybovite-K | KCuNa(MgFe3+)(AsO4)3 |
| 8.BC.05 | Angelellite | Fe3+4(AsO4)2O3 |
| 8.BC.10 | Frondelite | (Mn2+0.5Fe3+0.5)2Fe3+3(PO4)3(OH)5 |
| 8.BC.10 | Rockbridgeite | (Fe2+0.5Fe3+0.5)2Fe3+3(PO4)3(OH)5 |
| 8.BC.10 | Ferrirockbridgeite | (Fe3+0.67◻0.33)2(Fe3+)3(PO4)3(OH)4(H2O) |
| 8.BC.10 | Ferrorockbridgeite | (Fe2+,Mn2+)2(Fe3+)3(PO4)3(OH)4(H2O) |
| 8.BC.10 | Plimerite | ZnFe3+4(PO4)3(OH)5 |
Fluorescence of Aerugite
Not fluorescent
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 Aerugite
mindat.org URL:
https://www.mindat.org/min-36.html
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References for Aerugite
Reference List:
Davis, R. J., Hey, M. H., Kingsbury, A. W. G. (1965) Xanthiosite and aerugite. Mineralogical Magazine and Journal of the Mineralogical Society, 35 (269) 72-83 doi:10.1180/minmag.1965.035.269.10
Fleet, M. E.; Barbier, J. (1989) Structure of aerugite (Ni₈.₅As₃O₁₆) and interrelated arsenate and germanate structural series. Acta Crystallographica Section B Structural Science, 45 (3). 201-205 doi:10.1107/s0108768189002727
Roberts, Andrew C., Burns, Peter C., Gault, Robert A., Criddle, Alan J., Feinglos, Mark N., Stirling, John A.R. (2001) Paganoite, NiBi3+As5+O5, a new mineral from Johanngeorgenstadt, Saxony, Germany: description and crystal structure. European Journal of Mineralogy, 13 (1) 167-175 doi:10.1127/0935-1221/01/0013-0167
Localities for Aerugite
Showing 5 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.
Germany (TL) | |
| Bergemann (1858) +2 other references |
| Hajek (2010) |
| Thalheim et al. (2006) | |
Romania | |
| HÎRTOPANU et al. (2025) |
UK | |
| Davis et al. (1965) +1 other reference |
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Johanngeorgenstadt, Erzgebirgskreis, Saxony, Germany