Villyaellenite Mineral Data

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.

Name Pronunciation:

Villyaellenite + Pronunciation

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

Diaphaneity:

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
Ncalc = 1.62 - 1.72

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:

Bulk Density (Electron Density)=3.50 gm/cc
note: Specific Gravity of Villyaellenite =3.71 gm/cc.

Fermion Index:

Fermion Index = 0.0001714934
Boson Index = 0.9998285066

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Villyaellenite is Not Radioactive

Villyaellenite Classification

Dana Class:

39.02.01.03 (39)Hydrated Acid Phosphates, etc

(39.02)H2 (AB)5 (XO4)4 · x(H2O)

(39.02.01)Hureaulite Group

39.02.01.01 Hureaulite Mn5(PO3OH)2(PO4)2•4(H2O) C 2/c 2/m

39.02.01.02 Sainfeldite Ca5(AsO3OH)2(AsO4)2•4(H2O) C 2/c 2/m

39.02.01.03 Villyaellenite Mn5(AsO3OH)2(AsO4)2•4(H2O) C 2/c 2/m

39.02.01.04 IMA2008-047! Cd3Zn2(AsO3OH)2(AsO4)24?H2O C 2/c 2/m

39.02.01.05 IMA2008-066! Mn5(H2O)4(AsO3OH)2(AsO4)2 C 2/c 2/m

Strunz Class:

08.CB.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CB -With only medium-sized cations, RO4:H2O = 1:1

08.CB.10 Hureaulite Mn5(PO3OH)2(PO4)2•4(H2O) C 2/c 2/m

08.CB.10 Sainfeldite Ca5(AsO3OH)2(AsO4)2•4(H2O) C 2/c 2/m

08.CB.10 IMA2008-066! Mn5(H2O)4(AsO3OH)2(AsO4)2 C 2/c 2/m

08.CB.10 Villyaellenite Mn5(AsO3OH)2(AsO4)2•4(H2O) C 2/c 2/m

08.CB.10 IMA2008-047! Cd3Zn2(AsO3OH)2(AsO4)24?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 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Ask about Villyaellenite here :
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Print or Cut-and-Paste your Villyaellenite Specimen Label here :

Villyaellenite

Mn++5(AsO3OH)2(AsO4)2•4(H2O)
Dana No: 39.02.01.03 Strunz No: 08.CB.10
Locality:

Notes: