Villyaellenite
A valid IMA mineral species
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About Villyaellenite
Villy Aellen
Formula:
MnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O
Colour:
Colorless, orange to light pink
Lustre:
Sub-Vitreous, Resinous
Hardness:
4
Specific Gravity:
3.20
Crystal System:
Monoclinic
Member of:
Name:
Named by H. Sarp in 1984 after Villy Aellen, (1926, Neuchâtel, Switzerland - 2000), zoologist and former Director of the Natural History Museum of Geneva (Switzerland).
Isostructural with:
Compare giftgrubeite, the ordered (Ca:Mn = 3:2) intermediate member between villyaellenite and sainfeldite.
See also the closely related miguelromeroite. Note: The miguelromeroite samples from the Veta Negra mine, Chile, were originally labeled "villyaellenite".
See also the closely related miguelromeroite. Note: The miguelromeroite samples from the Veta Negra mine, Chile, were originally labeled "villyaellenite".
Unique Identifiers
Mindat ID:
4182
Long-form identifier:
mindat:1:1:4182:5
GUID
(UUID V4):
(UUID V4):
f98aed92-aec9-42f3-a031-e91c191da93f
IMA Classification of Villyaellenite
Approved
IMA Formula:
(Mn,Ca)Mn2Ca2(AsO3OH)2(AsO4)2 · 4H2O
Approval year:
1983
First published:
1984
Classification of Villyaellenite
8.CB.10
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
39.2.1.3
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
20.8.20
20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn
20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn
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 |
|---|---|---|
| Vy | 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 Villyaellenite
Sub-Vitreous, Resinous
Transparency:
Transparent, Translucent
Colour:
Colorless, orange to light pink
Streak:
White
Hardness:
4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
{100} good
{100} good
Density:
3.20 g/cm3 (Measured) 3.24 g/cm3 (Calculated)
Comment:
D as high as 3.72, Am Min (1988): 73:1172
Optical Data of Villyaellenite
Type:
Biaxial (-)
RI values:
nα = 1.660 - 1.713 nβ = 1.670 - 1.723 nγ = 1.676 - 1.729
2V:
Measured: 70.5° to 76°, Calculated: 75° to 75.6°
Birefringence:
0.016
Max Birefringence:
δ = 0.016
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
weak
Optical Extinction:
Y ^ c = 30°-40°.
Pleochroism:
Visible
Comments:
X=very pale orange pink, Y=exceedingly pale pink, Z=pale orange pink; Z>>X>Y.
Comments:
Higher optics may represent closeness to end-member.
Chemistry of Villyaellenite
Mindat Formula:
MnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O
Common Impurities:
Zn,Ca,Fe
Crystallography of Villyaellenite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 18.55 Å, b = 9.50 Å, c = 9.99 Å
β = 96.94°
β = 96.94°
Ratio:
a:b:c = 1.953 : 1 : 1.052
Unit Cell V:
1,747.59 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Rosettes of prismatic crystals, elongated || [001], tabular || {100}.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.21 Å | (50) |
| 4.45 Å | (30) |
| 3.24 Å | (50) |
| 3.21 Å | (100) |
| 3.13 Å | (30) |
| 3.06 Å | (70) |
| 2.98 Å | (40) |
| 2.34 Å | (30) |
Comments:
ICDD 41-1455, also 37-444.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Villyaellenite
Associated Minerals at Type Locality:
Reference:
Sarp, H. (1984) Villyaellenite, H2(Mn,Ca)5(AsO4)4·4H2O un nouveau minéral de Saint-Marie aux Mines (France). Schweizerische Mineralogische und Petrographische Mitteilungen: 64: 323-328.
Synonyms of Villyaellenite
Other Language Names for Villyaellenite
Relationship of Villyaellenite to other Species
Member of:
Other Members of this group:
| Chongite | Ca3Mg2(AsO4)2(AsO3OH)2 · 4H2O | Mon. 2/m : B2/b |
| Giftgrubeite | CaMn2Ca2(AsO4)2(AsO3OH)2 · 4H2O | Mon. 2/m : B2/b |
| Hureaulite | Mn2+5(PO3OH)2(PO4)2 · 4H2O | Mon. 2/m : B2/b |
| Miguelromeroite | MnMn2Mn2(AsO4)2(HAsO4)2 · 4H2O | Mon. 2/m : B2/b |
| Nyholmite | Cd3Zn2(AsO4)2(HAsO4)2 · 4H2O | Mon. 2/m : B2/b |
| Sainfeldite | Ca5(AsO4)2(AsO3OH)2 · 4H2O | Mon. 2/m : B2/b |
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 8.CB. | Krupičkaite | Cu6[AsO3(OH)]6 · 8H2O |
| 8.CB. | Ermeloite | Al(PO4) · H2O |
| 8.CB.05 | Serrabrancaite | MnPO4 · H2O |
| 8.CB.10 | Hureaulite | Mn2+5(PO3OH)2(PO4)2 · 4H2O |
| 8.CB.10 | UM1997-09-AsO:CaHMgZn | (Mg,Ca,Zn)5(AsO4)2(HAsO4)2 · 4H2O |
| 8.CB.10 | Nyholmite | Cd3Zn2(AsO4)2(HAsO4)2 · 4H2O |
| 8.CB.10 | Miguelromeroite | MnMn2Mn2(AsO4)2(HAsO4)2 · 4H2O |
| 8.CB.10 | Giftgrubeite | CaMn2Ca2(AsO4)2(AsO3OH)2 · 4H2O |
| 8.CB.15 | Krautite | Mn(HAsO4) · H2O |
| 8.CB.20 | Cobaltkoritnigite | Co(AsO3OH) · H2O |
| 8.CB.20 | Koritnigite | Zn(AsO3OH) · H2O |
| 8.CB.20 | Magnesiokoritnigite | Mg(AsO3OH) · H2O |
| 8.CB.25 | Yvonite | Cu(HAsO4) · 2H2O |
| 8.CB.30 | Geminite | Cu2+(AsO3OH) · H2O |
| 8.CB.35 | Schubnelite | Fe3+VO4 · H2O |
| 8.CB.40 | Radovanite | Cu2Fe3+(AsO4)(HAs3+O3)2 · H2O |
| 8.CB.45 | Kazakhstanite | Fe3+5V4+3V5+12O39(OH)9 · 9H2O |
| 8.CB.50 | Kolovratite | NixZny(VO4)0.67(x+y) · nH2O |
| 8.CB.60 | Burgessite | Co2(H2O)4[AsO3(OH)]2(H2O) |
| 8.CB.60 | Honzaite | Ni2(AsO3OH)2 · 5H2O |
| 8.CB.65 | Cardite | Zn5.5(AsO4)2(AsO3OH)(OH)3 · 3H2O |
Fluorescence of Villyaellenite
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 Villyaellenite
mindat.org URL:
https://www.mindat.org/min-4182.html
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Please feel free to link to this page.
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References for Villyaellenite
Localities for Villyaellenite
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.
Chile | |
| Kampf (2009) |
Czech Republic | |
| Lapis 2002 (7/8) |
France (TL) | |
| Sarp (1984) +2 other references |
| P&T N°23-24 et al. (Haut-Rhin) | |
| Bari (1982) |
Italy | |
| Campostrini et al. (2014) |
Japan | |
| Matsubara et al. (1996) |
Mexico | |
| descriptive mineralogy et al. (9-10) +3 other references |
| Thomas P. Moore (2008) | |
Romania | |
| Ghergari et al. (1994) |
USA | |
| Kampf et al. (1988) +1 other reference |
Quick NavTopAbout VillyaelleniteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Săcărâmb, Certeju de Sus, Hunedoara County, Romania