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Villyaellenite

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Formula:
MnMn
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
System:MonoclinicColour:Colorless, orange to ...
Hardness:4
Name:Named by H. Sarp in 1984 after Villy Aellen, Director of the Natural History Museum of Geneva (Switzerland).
Isostructural with:Hureaulite


Hureaulite Group.
See also the closely related miguelromeroite.

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

Classification of Villyaellenite

IMA status:Approved 1983
Strunz 8th edition ID:7/C.04-30
Nickel-Strunz 10th (pending) edition ID:8.CB.10

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
Dana 8th edition ID:39.2.1.3

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
Hey's CIM Ref.:20.8.20

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

Type Locality:Ste Marie-aux-Mines (Markirch), Haut-Rhin, Alsace, France
Year of Discovery:1984
Associated Minerals at type locality:
Fluckite

Physical Properties of Villyaellenite

Lustre:Sub-Vitreous, Resinous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Colorless, orange to light pink
Streak:White
Hardness (Mohs):4
Tenacity:Brittle
Cleavage:Distinct/Good
{100} good
Density (measured):3.20 g/cm3
Density (calculated):3.24 g/cm3
Comment:D as high as 3.72, Am Min (1988): 73:1172

Crystallography of Villyaellenite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b {B1 1 2/b} {C2/c} {C1 2/c 1}
Space Group Setting:C2/c
Cell Parameters:a = 18.55Å, b = 9.50Å, c = 9.99Å
β = 96.94°
Ratio:a:b:c = 1.953 : 1 : 1.052
Unit Cell Volume:V 1,747.59 ų (Calculated from Unit Cell)
Z:4
Morphology:Rosettes of prismatic crystals, elongated || [001], tabular || {100}.
X-Ray Powder Diffraction:
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.

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
Maximum Birefringence:δ = 0.016

Chart 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 Villyaellenite

Formula:
MnMn
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
Essential elements:As, Ca, H, Mn, O
All elements listed in formula:As, Ca, H, Mn, O
Common Impurities:Zn,Ca,Fe

Relationship of Villyaellenite to other Species

Structurally related to group(s):
Hureaulite Group
Related Minerals - Nickel-Strunz Grouping):

- +
8.CB.05Serrabrancaite
MnPO
 
4
 · H
 
2
O
8.CB.10Hureaulite
(Mn,Fe)
 
5
(PO
 
4
)
 
2
(HPO
 
4
)
 
2
 · 4H
 
2
O
8.CB.10Sainfeldite
CaCa
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
8.CB.10UM1997-09-AsO:CaHMgZn
(Mg,Ca,Zn)
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
8.CB.10Nyholmite
Cd
 
3
Zn
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
8.CB.10Miguelromeroite
MnMn
 
2
Mn
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
8.CB.15Fluckite
CaMn
2+
 
(HAsO
 
4
)
 
2
 · 2H
 
2
O
8.CB.15Krautite
Mn(HAsO
 
4
) · H
 
2
O
8.CB.20Cobaltkoritnigite
(Co,Zn)(HAsO
 
4
) · H
 
2
O
8.CB.20Koritnigite
Zn(HAsO
 
4
) · H
 
2
O
8.CB.25Yvonite
Cu(HAsO
 
4
) · 2H
 
2
O
8.CB.30Geminite
Cu(HAsO
 
4
) · H
 
2
O
8.CB.35Schubnelite
Fe
3+
 
VO
 
4
 · H
 
2
O
8.CB.40Radovanite
Cu
 
2
Fe
3+
 
(AsO
 
4
)(HAs
3+
 
O
 
3
)
 
2
 · H
 
2
O
8.CB.45Kazakhstanite
Fe
3+
5
V
4+
3
V
5+
12
O
 
39
(OH)
 
9
 · 9H
 
2
O
8.CB.50Kolovratite
Ni
 
x
Zn
 
y
(VO
 
4
)
 
0.67(x+y)
 · nH
 
2
O
8.CB.55Irhtemite
Ca
 
4
Mg(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
8.CB.60Burgessite
Co
 
2
(HAsO
 
4
)
 
2
 · 5H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
20.8.1Sarkinite
Mn
2+
2
(AsO
 
4
)(OH)
20.8.2Eveite
Mn
2+
2
(AsO
 
4
)(OH)
20.8.3Arsenoclasite
Mn
2+
5
(AsO
 
4
)
 
2
(OH)
 
4
20.8.4Flinkite
Mn
2+
2
Mn
3+
 
(AsO
 
4
)(OH)
 
4
20.8.5Jarosewichite
Mn
2+
3
Mn
3+
 
(AsO
 
4
)(OH)
 
6
20.8.6Allactite
Mn
2+
7
(AsO
 
4
)
 
2
(OH)
 
8
20.8.7Krautite
Mn(HAsO
 
4
) · H
 
2
O
20.8.8Synadelphite
Mn
2+
9
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
9
 · 2H
 
2
O
20.8.9Sterlinghillite
Mn
 
3
(AsO
 
4
)
 
2
 · 4H
 
2
O
20.8.10Geigerite
Mn
2+
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 10H
 
2
O
20.8.11Akrochordite
(Mn
2+
 
,Mg)
 
5
(AsO
 
4
)
 
2
(OH)
 
4
 · 4H
 
2
O
20.8.12Manganohörnesite
(Mn,Mg)
 
3
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.8.13Fluckite
CaMn
2+
 
(HAsO
 
4
)
 
2
 · 2H
 
2
O
20.8.14Brandtite
Ca
 
2
(Mn
2+
 
,Mg)(AsO
 
4
)
 
2
 · 2H
 
2
O
20.8.15Parabrandtite
Ca
 
2
Mn
2+
 
(AsO
 
4
)
 
2
 · 2H
 
2
O
20.8.16Wallkilldellite-(Mn)
Ca
 
2
Mn
2+
3
(AsO
 
4
)
 
2
(OH)
 
4
 · 9H
 
2
O
20.8.17Berzeliite
NaCa
 
2
(Mg,Mn
2+
 
)
 
2
(AsO
 
4
)
 
3
20.8.18Manganberzeliite
(Ca,Na)
 
3
(Mn
2+
 
,Mg)
 
2
(AsO
 
4
)
 
3
20.8.19Magnesiochlorophoenicite
(Mg,Mn)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
20.8.21Hematolite
(Mn,Mg,Al)
 
15
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
23
20.8.22Grischunite
NaCa
 
2
Mn
2+
5
Fe
3+
 
(AsO
 
4
)
 
6
 · 2H
 
2
O

Other Names for Villyaellenite

Synonyms:
IMA1983-008a
Other Languages:
German:Villyaellenit
Russian:Виллиэлленит
Spanish:Villyaellenita

Other Information

Fluorescence in UV light:Not fluorescent.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Villyaellenite

Reference List:

- +
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 Villyaellenite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Villyaellenite details from Handbook of Mineralogy (PDF)
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    • Localities for Villyaellenite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Chile
     
    • Atacama Region
      • Copiapó Province
        • Tierra Amarilla
          • Pampa Larga district
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Karlovy Vary Region
        • Krušné Hory Mts (Erzgebirge)
          • Jáchymov (St Joachimsthal) District
    		Lapis 2002(7/8), 63-65
    France
     
    • Alsace
      • Haut-Rhin
    		Sarp (1984); Am.Min.: 71 (1986): 1547 (abst.); 73 (1988):1172.
    Japan
     
    • Honshu Island
      • Tohoku Region
        • Fukushima Prefecture
          • Iwaki
    		Matsubara et al (1996) Mineralogical Journal, 18, #4, 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.
    		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.
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