Villyaellenite (original) (raw)

A valid IMA mineral species

About VillyaelleniteHide

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Formula:

MnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O

Colour:

Colorless, orange to light pink

Lustre:

Sub-Vitreous, Resinous

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).

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".

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:4182:5

f98aed92-aec9-42f3-a031-e91c191da93f

IMA Classification of VillyaelleniteHide

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IMA Formula:

(Mn,Ca)Mn2Ca2(AsO3OH)2(AsO4)2 · 4H2O

Type description reference:

Classification of VillyaelleniteHide

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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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of VillyaelleniteHide

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Transparency:

Transparent, Translucent

Colour:

Colorless, orange to light pink

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

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RI values:

_n_α = 1.660 - 1.713 _n_β = 1.670 - 1.723 _n_γ = 1.676 - 1.729

2V:

Measured: 70.5° to 76°, Calculated: 75° to 75.6°

δ = 0.016

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Optical Extinction:

Y ^ c = 30°-40°.

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 VillyaelleniteHide

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Mindat Formula:

MnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O

Common Impurities:

Zn,Ca,Fe

Crystallography of VillyaelleniteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

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)

Morphology:

Rosettes of prismatic crystals, elongated || [001], tabular || {100}.

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

ICDD 41-1455, also 37-444.

Geological EnvironmentHide

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Type Occurrence of VillyaelleniteHide

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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 VillyaelleniteHide

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Other Language Names for VillyaelleniteHide

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Relationship of Villyaellenite to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of VillyaelleniteHide

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Other InformationHide

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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 VillyaelleniteHide

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References for VillyaelleniteHide

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Reference List:

Hawthorne, F.C., Bladh, K.W., Burke, E.A.J., Ercit, S., Grew, E.S., Grice, J.D., Puziewicz, J., Roberts, A.C., Schedler, R.A., Shigley, J.E. (1986) New mineral names. American Mineralogist: 71: 1543-1548.

Localities for VillyaelleniteHide

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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

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- 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). 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.