Ardennite Mineral Data

Ardennite Mineral Data +

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General Ardennite Information

Chemical Formula:

(Mn++,Ca,Mg)4(Al,Mg,Fe)6(SiO4)2(Si3O10)(AsO4,VO4)(OH)6

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

Empirical Formula:

Mn²⁺_2.8Ca_0.8Mg_1.4Al_4.7Fe³⁺_0.4(AsO₄)_0.9(VO₄)_0.1(SiO₄)₂(Si₃O₁₀)(OH)₆

Environment:

In pegmatites and quartz veins in schist and highly oxidized Mn, Al-rich metasediments.

IMA Status:

Valid Species (Pre-IMA) 1872

Locality:

Salmchateau in the Ardennes Mountains, Belgium. Link to MinDat.org Location Data.

Name Origin:

After the locality.

Synonym:

Dewalquite

ICSD 34684

PDF 41-1391

Ardennite Image

Images:

Ardennite

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

Ardennite Crystallography

Axial Ratios:

a:b:c =0.4698:1:0.3141

Cell Dimensions:

a = 8.72, b = 18.56, c = 5.83, Z = 2; V = 943.55 Den(Calc)= 3.65

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnmm

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

By Intensity(I/I_o): 2.574(1), 2.911(0.7), 4.21(0.6),

Crystal Structure:

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Donnay G , Allmann R , Acta Crystallographica, Section B , 24 (1968) p.845-855, Si3O10 groups in the crystal structure of ardennite

Physical Properties of Ardennite

Cleavage:

[010] Perfect, [110] Distinct, [001] Parting

Color:

Yellow, Yellow brown, Dark brown, Orange, Black.

Density:

3.62 - 3.75, Average = 3.68

Diaphaniety:

Nearly opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

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

Hardness:

6-7 - Orthoclase-Quartz

Luster:

Subadamantine

Streak:

pale brownish yellow

Optical Properties of Ardennite

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

Optical Data:

Biaxial (+), b=1.74-1.79, 2V(Meas)=0-70. Dispersion strong, r > v.

Pleochroism (x):

dark brownish yellow.

Pleochroism (y):

golden yellow.

Pleochroism (z):

pale yellow.

Calculated Properties of Ardennite

Electron Density:

r_electron=3.57 gm/cc
note: r_Ardennite=3.65 gm/cc.

Fermion Index

Fermion Index = 0.01033
Boson Index = 0.98967

Photoelectric:

PE_Ardennite= 10.16 barns/electron
U=PE_Ardennite x r_electron= 36.25 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ardennite is Not Radioactive

Ardennite Classification

Dana Class:

58.3.1.1 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

(58.3)with insular single and triple groups (n=1,3)

(58.3.1)Ardennite group

58.3.1.1 Ardennite (Mn,Ca,Mg)4(Al,Mg,Fe)6(SiO4)2(Si3O10)(AsO4,VO4)(OH)6 Pnmm 2/m 2/m 2/m

58.3.1.2 Orientite Ca2MnMn2Si3O10(OH)4 C mcm 2/m 2/m 2/m

Strunz Class:

VIII/C.34-10 VIII - Silicates

VIII/C - Sorosilicates, other group-silicates

VIII/C.34 - Ardennite - Orientite series

VIII/C.34-10 Ardennite (Mn,Ca,Mg)4(Al,Mg,Fe)6(SiO4)2(Si3O10)(AsO4,VO4)(OH)6 Pnmm 2/m 2/m 2/m

VIII/C.34-14 Medaite (Mn,Ca)6(V,As)Si5O18(OH) P 2₁/n 2/m

VIII/C.34-16 Saneroite Na2(Mn,Fe)10Si11VO34(OH)4 P1 1

VIII/C.34-20 Orientite Ca2MnMn2Si3O10(OH)4 C mcm 2/m 2/m 2/m

Other Ardennite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Ardennite

(Mn++,Ca,Mg)4(Al,Mg,Fe)6(SiO4)2(Si3O10)(AsO4,VO4)(OH)6
Dana No: 58.3.1.1 Strunz No: VIII/C.34-10
Locality:

Notes: