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Villyaellenite Mineral Data

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General Villyaellenite Information

Help on Chemical  Formula: Chemical Formula: Mn++5(AsO3OH)2(AsO4)2•4(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mn2+5(AsO3OH)2(AsO4)2•4(H2O)
Help on Environment: Environment: Forms a series with sainfeldite.
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: Ste.-Marie-aux-Mines, Vosges Mountains, Alsace, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Villy Aellen, director of the Natural History Museum of Geneva, Switzerland.
Help on Name Pronunciation: Name Pronunciation: Villyaellenite + Pronunciation Say VILLYAELLENITE
Help on Synonym: Synonym: ICSD 202708
  PDF 41-1455

Villyaellenite Image

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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

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.9452:1:1.0549
Help on Cell Dimensions: Cell Dimensions: a = 18.015, b = 9.261, c = 9.77, Z = 4; beta = 96.24° V = 1,620.34 Den(Calc)= 3.71
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.279(1), 8.476(0.9), 3.132(0.6),

Physical Properties of Villyaellenite

Help on Cleavage: Cleavage: {100} Good
Help on Color: Color: Colorless, Light pink.
Help on Density: Density: 3.2
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Villyaellenite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (-), a=1.713, b=1.723, g=1.729, bire=0.0160, 2V(Calc)=74, 2V(Meas)=70.
Help on Pleochroism (x): Pleochroism (x): very pale orange pink.
Help on Pleochroism (y): Pleochroism (y): very pale orange pink.
Help on Pleochroism (z): Pleochroism (z): pale orange pink.

Calculated Properties of Villyaellenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.50 gm/cc
note: Specific Gravity of Villyaellenite =3.71 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001714934
Boson Index = 0.9998285066
Help on Photoelectric: Photoelectric: PEVillyaellenite = 30.69 barns/electron
U=PEVillyaellenite x rElectron Density= 107.50 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Villyaellenite is Not Radioactive

Villyaellenite Classification

Help on  Dana Class: Dana Class: (39)Hydrated Acid Phosphates, etc
  (39.02)H2 (AB)5 (XO4)4 � x(H2O)
  (39.02.01)Hureaulite Group Hureaulite Mn5(PO3OH)2(PO4)2•4(H2O) C 2/c 2/m Sainfeldite Ca5(AsO3OH)2(AsO4)2•4(H2O) C 2/c 2/m Villyaellenite Mn5(AsO3OH)2(AsO4)2•4(H2O) C 2/c 2/m IMA2008-047! Cd3Zn2(AsO3OH)2(AsO4)24?H2O C 2/c 2/m IMA2008-066! Mn5(H2O)4(AsO3OH)2(AsO4)2 C 2/c 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: 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

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Dana No: Strunz No: 08.CB.10





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