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Villyaellenite

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About VillyaelleniteHide

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
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:
Hureaulite Group.
See also the closely related miguelromeroite.

Note: The miguelromeroite samples from the Veta Negra mine, Chile, were originally labeled "villyaellenite".


Classification of VillyaelleniteHide

Approved
Approval Year:
1983
8.CB.10

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
20.8.20

20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn

Physical Properties of VillyaelleniteHide

Sub-Vitreous, Resinous
Transparency:
Transparent, Translucent
Colour:
Colorless, orange to light pink
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
Distinct/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 VillyaelleniteHide

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.
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.

Chemical Properties of VillyaelleniteHide

Formula:
MnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O
IMA Formula:
(Mn,Ca)Mn2Ca2(AsO3OH)2(AsO4)2 · 4H2O
Common Impurities:
Zn,Ca,Fe

Crystallography of VillyaelleniteHide

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°
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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.21 (50)
4.45 (30)
3.24 (50)
3.21 (100)
3.13 (30)
3.06 (70)
2.98 (40)
2.34 (30)
Comments:
ICDD 41-1455, also 37-444.

Type Occurrence of VillyaelleniteHide

Synonyms of VillyaelleniteHide

Other Language Names for VillyaelleniteHide

Relationship of Villyaellenite to other SpeciesHide

Other Members of this group:
ChongiteCa3Mg2(AsO4)2(AsO3OH)2·4H2OMon. 2/m : B2/b
GiftgrubeiteCaMn2Ca2(AsO4)2(AsO3OH)2·4H2OMon. 2/m : B2/b
Hureaulite(Mn,Fe)5(PO4)2(HPO4)2 · 4H2OMon. 2/m : B2/b
MiguelromeroiteMnMn2Mn2(AsO4)2(HAsO4)2 · 4H2OMon. 2/m : B2/b
NyholmiteCd3Zn2(AsO4)2(HAsO4)2 · 4H2OMon. 2/m : B2/b
SainfelditeCa5(AsO4)2(AsO3OH)2 · 4H2OMon. 2/m : B2/b

Common AssociatesHide

Associated Minerals Based on Photo Data:
Siderite1 photo of Villyaellenite associated with Siderite on mindat.org.
Arsenic1 photo of Villyaellenite associated with Arsenic on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.CB.05SerrabrancaiteMnPO4 · H2OMon. 2/m : B2/b
8.CB.10Hureaulite(Mn,Fe)5(PO4)2(HPO4)2 · 4H2OMon. 2/m : B2/b
8.CB.10SainfelditeCa5(AsO4)2(AsO3OH)2 · 4H2OMon. 2/m : B2/b
8.CB.10UM1997-09-AsO:CaHMgZn(Mg,Ca,Zn)5(AsO4)2(HAsO4)2 · 4H2OMon.
8.CB.10NyholmiteCd3Zn2(AsO4)2(HAsO4)2 · 4H2OMon. 2/m : B2/b
8.CB.10MiguelromeroiteMnMn2Mn2(AsO4)2(HAsO4)2 · 4H2OMon. 2/m : B2/b
8.CB.15FluckiteCaMn2+(HAsO4)2 · 2H2OTric. 1 : P1
8.CB.15KrautiteMn(HAsO4) · H2OMon. 2 : P21
8.CB.20Cobaltkoritnigite(Co,Zn)(HAsO4) · H2OTric. 1 : P1
8.CB.20KoritnigiteZn(HAsO4) · H2OTric. 1 : P1
8.CB.25YvoniteCu(HAsO4) · 2H2OTric.
8.CB.30GeminiteCu(HAsO4) · H2OTric.
8.CB.35SchubneliteFe3+VO4 · H2OTric.
8.CB.40RadovaniteCu2Fe3+(AsO4)(HAs3+O3)2 · H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.CB.45KazakhstaniteFe3+5V4+3V5+12O39(OH)9 · 9H2OMon.
8.CB.50KolovratiteNixZny(VO4)0.67(x+y) · nH2O
8.CB.55IrhtemiteCa4Mg(AsO4)2(HAsO4)2 · 4H2OMon.
8.CB.60BurgessiteCo2(H2O)4[AsO3(OH)]2(H2O)Mon. 2/m

Related Minerals - Dana Grouping (8th Ed.)Hide

39.2.1.1Hureaulite(Mn,Fe)5(PO4)2(HPO4)2 · 4H2OMon. 2/m : B2/b
39.2.1.2SainfelditeCa5(AsO4)2(AsO3OH)2 · 4H2OMon. 2/m : B2/b
39.2.1.4UM1997-09-AsO:CaHMgZn(Mg,Ca,Zn)5(AsO4)2(HAsO4)2 · 4H2OMon.
39.2.1.4MiguelromeroiteMnMn2Mn2(AsO4)2(HAsO4)2 · 4H2OMon. 2/m : B2/b
39.2.1.6NyholmiteCd3Zn2(AsO4)2(HAsO4)2 · 4H2OMon. 2/m : B2/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.8.1SarkiniteMn2+2(AsO4)(OH)Mon. 2/m : P2/m
20.8.2EveiteMn2+2(AsO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnnm
20.8.3ArsenoclasiteMn2+5(AsO4)2(OH)4Orth.
20.8.4FlinkiteMn2+2Mn3+(AsO4)(OH)4Orth.
20.8.5JarosewichiteMn2+3Mn3+(AsO4)(OH)6Orth. 2 2 2
20.8.6AllactiteMn2+7(AsO4)2(OH)8Mon. 2/m : P21/b
20.8.7KrautiteMn(HAsO4) · H2OMon. 2 : P21
20.8.8SynadelphiteMn2+9(As5+O4)2(As3+O3)(OH)9 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnma
20.8.9SterlinghilliteMn3(AsO4)2 · 4H2OTric. 1 : P1
20.8.10GeigeriteMn2+5(AsO4)2(HAsO4)2 · 10H2OTric.
20.8.11Akrochordite(Mn2+,Mg)5(AsO4)2(OH)4 · 4H2OMon. 2/m : P21/b
20.8.12Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2OMon. 2/m : P2/m
20.8.13FluckiteCaMn2+(HAsO4)2 · 2H2OTric. 1 : P1
20.8.14BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2OMon. 2/m : P21/b
20.8.15ParabrandtiteCa2Mn2+(AsO4)2 · 2H2OTric.
20.8.16WallkilldelliteCa2Mn2+3(AsO4)2(OH)4 · 9H2OHex.
20.8.17Berzeliite(NaCa2)Mg2(AsO4)3Iso. m3m (4/m 3 2/m) : Ia3d
20.8.18ManganberzeliiteNaCa2Mn2+2(AsO4)3Iso. m3m (4/m 3 2/m) : Ia3d
20.8.19Magnesiochlorophoenicite(Mg,Mn)3Zn2(AsO4)(OH,O)6Mon. 2/m : B2/m
20.8.21Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23Trig. 3 : R3
20.8.22GrischuniteNaCa2Mn2+5Fe3+(AsO4)6 · 2H2OOrth.

Fluorescence of VillyaelleniteHide

Not fluorescent.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for VillyaelleniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Schweizerische mineralogische und petrographische Mitteilungen (1984): 64: 323-328.
American Mineralogist (1988): 73: 1172-1178, structure.
American Mineralogist 94,1535-1540(2009)

Internet Links for VillyaelleniteHide

Localities for VillyaelleniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Chile
 
  • Atacama Region
    • Copiapó Province
      • Tierra Amarilla
        • Pampa Larga district
Kampf, A. R. (2009). Miguelromeroite, the Mn analogue of sainfeldite, and redefinition of villyaellenite as an ordered intermediate in the sainfeldite-miguelromeroite series. American Mineralogist, 94(11-12), 1535-1540.
Czech Republic
 
  • Karlovy Vary Region
    • Krušné Hory Mts (Erzgebirge)
      • Jáchymov District (St Joachimsthal)
Lapis 2002(7/8), 63-65
France (TL)
 
  • Grand Est
    • Haut-Rhin
Sarp (1984); Am.Min.: 71 (1986): 1547 (abst.); 73 (1988):1172.
P&T N°23-24, H. BARI 1982, Minéralogie des filons du Neuenberg à Sainte Marie aux Mines (Haut-Rhin).
          • Sankt Jakob vein
P&T N°23-24, H. BARI 1982, Minéralogie des filons du Neuenberg à Sainte Marie aux Mines (Haut-Rhin).
Japan
 
  • Honshu Island
    • Tohoku Region
      • Fukushima Prefecture
        • Iwaki City
Matsubara, S., Kato, A., Shimizu, M., Sekiuchi, K., and Suzuki, M. (1996) Romeite from the Gozaisho mine, Iwaki, Japan. Mineralogical Journal 18, 155-160.
Mexico
 
  • Durango
    • Mun. de Mapimí
      • Mapimí
Mineralogical Record (2003) 34:5 The Ojuela Mine; American Mineralogist, Volume 73, pages 1172-1 178, 1988
Thomas P. Moore (2008) Lapis, 33, #7-8, 33-40.
Romania
 
  • Hunedoara Co.
    • Deva
Ghegari, L. et al (1994), Studia Univ. Babes-Bolyai 39(1),127-140
USA
 
  • New Jersey
    • Sussex Co.
      • Franklin mining district
        • Ogdensburg
          • Sterling Hill
Kampf, A.R. & Ross, C.R., II: Am.Min.:73:1172-1178 (1988); Dunn(1995):Pt5:684.
Mineral and/or Locality  
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