Xanthiosite
A valid IMA mineral species - grandfathered
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About Xanthiosite
Formula:
Ni3(AsO4)2
Colour:
Golden yellow
Lustre:
Waxy, Dull, Earthy
Hardness:
4
Specific Gravity:
5.37
Crystal System:
Monoclinic
Name:
Named in 1869 by Gilbert Joseph Adam from the Greek "xanthos", yellow, plus "thion", sulphur, alluding to its sulphur yellow color.
Type Locality:
An orthorhombic synthetic polymorph is known.
Unique Identifiers
Mindat ID:
4327
Long-form identifier:
mindat:1:1:4327:0
IMA Classification of Xanthiosite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Ni2+3◻(As5+O4)2
Classification of Xanthiosite
8.AB.25
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
B : With medium-sized cations
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
B : With medium-sized cations
Dana 7th ed.:
38.3.2.1
38.3.2.1
38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
3 : (AB)3(XO4)2
38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
3 : (AB)3(XO4)2
20.10.8
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 |
|---|---|---|
| Xth | 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 Xanthiosite
Waxy, Dull, Earthy
Transparency:
Translucent
Colour:
Golden yellow
Hardness:
4 on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Density:
5.37 g/cm3 (Measured) 5.37 g/cm3 (Calculated)
Chemistry of Xanthiosite
Mindat Formula:
Ni3(AsO4)2
Element Weights:
Elements listed:
Crystallography of Xanthiosite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/a
Cell Parameters:
a = 10.174 Å, b = 9.548 Å, c = 5.766 Å
β = 92.98°
β = 92.98°
Ratio:
a:b:c = 1.066 : 1 : 0.604
Unit Cell V:
559.36 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Powdery
Comment:
Min Mag 35:72 (1965)
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) |
|---|---|---|---|---|---|---|---|
| 0009846 | Xanthiosite | Barbier J, Frampton C (1991) Structures of orthorhombic and monoclinic Ni3(AsO4)2 Acta Crystallographica B47 457-462 |  | 1991 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.32 Å | (60) |
| 3.90 Å | (50) |
| 3.67 Å | (50) |
| 3.46 Å | (80) |
| 2.75 Å | (80) |
| 2.68 Å | (80) |
| 2.62 Å | (60) |
| 2.53 Å | (100) |
Comments:
ICDD 18-874
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] |
Type Occurrence of Xanthiosite
Geological Setting of Type Material:
As-Ni-U ore deposit
Associated Minerals at Type Locality:
Other Language Names for Xanthiosite
Dutch:Xanthiosiet
German:Xanthiosit
Russian:Ксантиозит
Simplified Chinese:黄砷镍矿
Spanish:Xanthiosita
Traditional Chinese:黃砷鎳礦
Common Associates
Associations Based on Photo Data:
| 5 photos of Xanthiosite associated with Aerugite | Ni8.5(AsO4)2As5+O8 |
| 2 photos of Xanthiosite associated with Niasite | Ni2+4.5(AsO4)3 |
| 2 photos of Xanthiosite associated with Johanngeorgenstadtite | Ni2+4.5(AsO4)3 |
| 1 photo of Xanthiosite associated with Petewilliamsite | (Ni,Co)30(As2O7)15 |
Related Minerals - Strunz-mindat Grouping
| 8.AB. | Kryzaite | Na4(MgCr)(PO4)3 |
| 8.AB. | Niasite | Ni2+4.5(AsO4)3 |
| 8.AB. | Johanngeorgenstadtite | Ni2+4.5(AsO4)3 |
| 8.AB. | Rodolicoite | Fe3+PO4 |
| 8.AB. | Karwowskiite | Ca9Mg(Fe2+0.5◻0.5)(PO4)7 |
| 8.AB. | Olsenite | KFe4(PO4)3 |
| 8.AB. | Borisenkoite | Cu3[(V,As)O4]2 |
| 8.AB.05 | Farringtonite | Mg3(PO4)2 |
| 8.AB.10 | Natrophilite | NaMn2+PO4 |
| 8.AB.10 | 'Sicklerite' | Li1-x(Mn3+xMn2+1-x)PO4 |
| 8.AB.10 | Simferite | LiMg(PO4) |
| 8.AB.10 | Heterosite | Fe3+(PO4) |
| 8.AB.10 | Lithiophilite | LiMn2+PO4 |
| 8.AB.10 | Karenwebberite | NaFe2+PO4 |
| 8.AB.10 | Triphylite | LiFe2+PO4 |
| 8.AB.10 | 'Ferrisicklerite' | Li1-x(Fe3+xFe2+1-x)PO4 |
| 8.AB.10 | Purpurite | Mn3+(PO4) |
| 8.AB.15 | Zavalíaite | Mn2+3(PO4)2 |
| 8.AB.15 | Chopinite | Mg3(PO4)2 |
| 8.AB.15 | Sarcopside | Fe2+3(PO4)2 |
| 8.AB.20 | Beusite | Mn2+Mn2+2 (PO4)2 |
| 8.AB.20 | Graftonite-(Ca) | CaFe2+2(PO4)2 |
| 8.AB.20 | Graftonite-(Mn) | MnFe2+2(PO4)2 |
| 8.AB.20 | Graftonite | Fe2+Fe2+2(PO4)2 |
| 8.AB.20 | Beusite-(Ca) | CaMn2+2(PO4)2 |
| 8.AB.30 | Lammerite | Cu3(AsO4)2 |
| 8.AB.30 | Paralammerite | Cu3(AsO4)2 |
| 8.AB.35 | Mcbirneyite | Cu3(VO4)2 |
| 8.AB.35 | Pseudolyonsite | Cu3(VO4)2 |
| 8.AB.35 | Stranskiite | Zn2Cu(AsO4)2 |
| 8.AB.40 | Michalskiite | Fe3+1.33Cu2+2(MgFe3+)2(VO4)6 |
| 8.AB.40 | Lyonsite | Cu3Fe4(VO4)6 |
Fluorescence of Xanthiosite
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 Xanthiosite
mindat.org URL:
https://www.mindat.org/min-4327.html
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References for Xanthiosite
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 [Suspected fraud regarding occurrence]
Localities for Xanthiosite
Showing 4 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) | |
| C. Bergemann (1858) +1 other reference |
Greece | |
| Rieck (1999) |
Iran | |
| Khoshnoodi et al. (2025) |
UK | |
| Davis et al. (1965) +1 other reference |
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Johanngeorgenstadt, Erzgebirgskreis, Saxony, Germany