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Ardennite-(As) Mineral Data

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General Ardennite-(As) Information

Help on Chemical  Formula: Chemical Formula: (Mn++,Ca,Mg)4(Al,Mg,Fe)6(SiO4)2(Si3O10)(AsO4,VO4)(OH)6
Help on Composition: Composition: Molecular Weight = 1,036.05 gm
   Calcium     3.09 %  Ca    4.33 % CaO
   Magnesium   3.28 %  Mg    5.45 % MgO
   Manganese  14.85 %  Mn   19.17 % MnO
   Aluminum   12.24 %  Al   23.13 % Al2O3
   Vanadium    0.49 %  V     0.88 % V2O5
   Iron        2.16 %  Fe    3.08 % Fe2O3
   Silicon    13.55 %  Si   29.00 % SiO2
   Arsenic     6.51 %  As    9.98 % As2O5
   Hydrogen    0.58 %  H     5.22 % H2O
   Oxygen     43.24 %  O
             ______        ______ 
             100.00 %      100.23 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+2.8Ca0.8Mg1.4Al4.7Fe3+0.4(AsO4)0.9(VO4)0.1(SiO4)2(Si3O10)(OH)6
Help on Environment: Environment: In pegmatites and quartz veins in schist and highly oxidized Mn, Al-rich metasediments. Forms a series with ardennite-(V).
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1872, Renamed 2007 to Adrennite-(As)
Help on Locality: Locality: Salmchateau in the Ardennes Mountains, Belgium. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: After the locality. Renamed to ardennite-(As) with the discovery of ardennite-(V).
Help on Name Pronunciation: Name Pronunciation: Ardennite-(As) + Pronunciation Say ARDENNITE-(AS)
Help on Synonym: Synonym: Ardennite
  Dewalquite
 

Ardennite-(As) Image

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  Ardennite-(As)

Comments: Yellow ardennite crystals in white quartz matrix.
Location: Salmch√Ęteau, Vielsalm, Stavelot Massif, Ardennes, Luxembourg Province, Belgium. Scale: 30x20x17 mm.
© John Betts - Fine Minerals

Ardennite-(As) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4698:1:0.3141
Help on Cell Dimensions: Cell Dimensions: a = 8.72, b = 18.56, c = 5.83, Z = 2; V = 943.55 Den(Calc)= 3.65
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.574(1), 2.911(0.7), 4.21(0.6),
 

Physical Properties of Ardennite-(As)

Help on Cleavage: Cleavage: {010} Perfect, {110} Distinct, {001} Parting
Help on Color: Color: Yellow, Yellow brown, Dark brown, Orange, Black.
Help on Density: Density: 3.62 - 3.75, Average = 3.68
Help on Diaphaneity: Diaphaneity: Nearly opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 6-7 - Orthoclase-Quartz
Help on Luster: Luster: Subadamantine
Help on Streak: Streak: pale brownish yellow
 

Optical Properties of Ardennite-(As)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.023 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2096,KPDmeas= 0.2076,KC= 0.2125
Ncalc = 1.77 - 1.8
Help on Optical Data: Optical Data: Biaxial (+), b=1.74-1.79, 2V(Meas)=0-70. Dispersion strong, r > v.
Help on Pleochroism (x): Pleochroism (x): dark brownish yellow.
Help on Pleochroism (y): Pleochroism (y): golden yellow.
Help on Pleochroism (z): Pleochroism (z): pale yellow.
 

Calculated Properties of Ardennite-(As)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.57 gm/cc
note: Specific Gravity of Ardennite-(As) =3.65 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEArdennite-(As) = 10.16 barns/electron
U=PEArdennite-(As) x rElectron Density= 36.25 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ardennite-(As) is Not Radioactive
 

Ardennite-(As) Classification

Help on  Dana Class: Dana Class: 58.03.01.01 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
  (58.03)with insular single and triple groups (n=1,3)
  (58.03.01)Ardennite group
 
58.03.01.01 Ardennite-(As) (Mn,Ca,Mg)4(Al,Mg,Fe)6(SiO4)2(Si3O10)(AsO4,VO4)(OH)6 Pnmm 2/m 2/m 2/m
 
58.03.01.02 Orientite Ca2MnMn2Si3O10(OH)4 C mcm 2/m 2/m 2/m
 
58.03.01.03 Ardennite-(V)! Mn4[Al4(Mg,Al,Fe,Mn)2][Si5(V,Si)]O22(OH)6 Pnmm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.BJ.40 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BJ -Sorosilicates with Si3O10, Si4O11, etc
 
09.BJ.40 Ardennite-(As) (Mn,Ca,Mg)4(Al,Mg,Fe)6(SiO4)2(Si3O10)(AsO4,VO4)(OH)6 Pnmm 2/m 2/m 2/m
 
09.BJ.40 Ardennite-(V)! Mn4[Al4(Mg,Al,Fe,Mn)2][Si5(V,Si)]O22(OH)6 Pnmm 2/m 2/m 2/m
 

Other Ardennite-(As) Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Ardennite-(As) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Ardennite-(As)

(Mn++,Ca,Mg)4(Al,Mg,Fe)6(SiO4)2(Si3O10)(AsO4,VO4)(OH)6
Dana No: 58.03.01.01 Strunz No: 09.BJ.40
Locality:

 

Notes:

 

 
   
 


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