Villyaellenite Mineral Data

Villyaellenite Mineral Data +

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General Villyaellenite Information

Chemical Formula:

Mn++5(AsO3OH)2(AsO4)2·4(H2O)

Composition:

Molecular Weight = 904.44 gm

Manganese 30.37 % Mn 39.22 % MnO

Arsenic 33.13 % As 50.82 % As₂O₅

Hydrogen 1.11 % H 9.96 % H₂O

Oxygen 35.38 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₅(AsO₃OH)₂(AsO₄)₂·4(H₂O)

Environment:

Forms a series with sainfeldite.

IMA Status:

Approved IMA 1984

Locality:

Ste.-Marie-aux-Mines, Vosges Mountains, Alsace, France. Link to MinDat.org Location Data.

Name Origin:

Named for Villy Aellen, director of the Natural History Museum of Geneva, Switzerland.

Synonym:

ICSD 202708

PDF 41-1455

Villyaellenite Image

Images:

Villyaellenite

Comments: Bright rose red crystals of villyaellenite to 2.5 mm on gossan.
Location: Veta Negra Mine, Tierra Amarilla, Chile. Scale: Picture size 1.5 cm.
© John Veevaert

Images:

Villyaellenite

Comments: Peach colored radial sprays of villyaellenite 2 to 3mm in size.
Location: Veta Negra mine, Pampa Larga, Copiapo, Atacama Province, Chile. Scale: Picture size 1.5 cm.
© Tom Loomis / Dakota Matrix

Villyaellenite Crystallography

Axial Ratios:

a:b:c =1.9452:1:1.0549

Cell Dimensions:

a = 18.015, b = 9.261, c = 9.77, Z = 4; beta = 96.24° V = 1,620.34 Den(Calc)= 3.71

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.279(1), 8.476(0.9), 3.132(0.6),

Crystal Structure:

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Kampf A R , Ross C R , American Mineralogist , 73 (1988) p.1172-1178, End-member Villyaellenite from Mapimi, Durango, Mexico: Descriptive mineralogy,, crystal structure, and implications for the ordering of Mn and Ca in type, villyaellenite

Physical Properties of Villyaellenite

Cleavage:

[100] Good

Color:

Colorless, Light pink.

Density:

3.2

Diaphaniety:

Transparent

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Villyaellenite

Gladstone-Dale:

CI meas= -0.166 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1945,KPDmeas= 0.2255,KC= 0.1935

Optical Data:

Biaxial (-), a=1.713, b=1.723, g=1.729, bire=0.0160, 2V(Calc)=74, 2V(Meas)=70.

Pleochroism (x):

very pale orange pink.

Pleochroism (y):

very pale orange pink.

Pleochroism (z):

pale orange pink.

Calculated Properties of Villyaellenite

Electron Density:

r_electron=3.50 gm/cc
note: r_{Villyaellenite}=3.71 gm/cc.

Fermion Index

Fermion Index = 0.00017
Boson Index = 0.99983

Photoelectric:

PE_{Villyaellenite}= 30.69 barns/electron
U=PE_{Villyaellenite} x r_electron= 107.50 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Villyaellenite is Not Radioactive

Villyaellenite Classification

Dana Class:

39.2.1.3 (39)Hydrated Acid Phosphates, etc

(39.2)H2 (AB)5 (XO4)4 · x(H2O)

(39.2.1)Dana Group

39.2.1.1 Hureaulite Mn5(PO3OH)2(PO4)2·4(H2O) C 2/c 2/m

39.2.1.2 Sainfeldite Ca5(AsO3OH)2(AsO4)2·4(H2O) C 2/c 2/m

39.2.1.3 Villyaellenite Mn5(AsO3OH)2(AsO4)2·4(H2O) C 2/c 2/m

Strunz Class:

VII/C.04-30 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.04 - Hureaulite - Villyaellenite series

VII/C.04-10 Hureaulite Mn5(PO3OH)2(PO4)2·4(H2O) C 2/c 2/m

VII/C.04-20 Sainfeldite Ca5(AsO3OH)2(AsO4)2·4(H2O) C 2/c 2/m

VII/C.04-30 Villyaellenite Mn5(AsO3OH)2(AsO4)2·4(H2O) C 2/c 2/m

Other Villyaellenite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Villyaellenite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 - Franklin Minerals(Dunn) 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Villyaellenite

Mn++5(AsO3OH)2(AsO4)2·4(H2O)
Dana No: 39.2.1.3 Strunz No: VII/C.04-30
Locality:

Notes: