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Ardennite-(As)

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Formula:
Mn42+Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6
System:
Orthorhombic
Colour:
Yellow to Brown
Hardness:
6 - 7
Name:
For the type locality in the Ardennes Mountains, Belgium.
Ardennite Group.

The AsO4-analogue of (the less common) Ardennite-(V).
Prior to an IMA redefinition in 2007, the name ardennite was used for ardennite-(As).

Classification of Ardennite-(As)

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.BJ.40

9 : SILICATES (Germanates)
B : Sorosilicates
J : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] and greater coordination
58.3.1.1

58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
3 : Insular, Mixed, Single, and Larger Tetrahedral Groups with insular single and triple groups (n=1, 3)
17.7.4

17 : Silicates Containing other Anions
7 : Silicates with vanadate, arsenate or antimonate
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First Recorded Occurrence of Ardennite-(As)

Year of Discovery:
1872
Geological Setting of First Recorded Material:
Pegmatites and quartz veins in schist

Occurrences of Ardennite-(As)

Geological Setting:
Highly oxidized, Mn, Al metasediments.

Physical Properties of Ardennite-(As)

Sub-Adamantine
Diaphaneity (Transparency):
Opaque
Colour:
Yellow to Brown
Hardness (Mohs):
6 - 7
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {010}, distinct on {110}
Parting:
On {001}
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
3.69 - 3.75 g/cm3 (Measured)    3.74 g/cm3 (Calculated)

Crystallography of Ardennite-(As)

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 8.7126(8) Å, b = 18.5124(11) Å, c = 5.8108(8) Å
Ratio:
a:b:c = 0.471 : 1 : 0.314
Unit Cell Volume:
V 937.23 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Prismatic, radiating fibrous groups.

Crystallographic forms of Ardennite-(As)

Crystal Atlas:
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Ardennite no.1 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Optical Data of Ardennite-(As)

Type:
Biaxial (+)
Dispersion:
strong
Pleochroism:
Strong
Comments:
X= dark brownish yellow
Y= golden yellow
X= pale yellow

Chemical Properties of Ardennite-(As)

Formula:
Mn42+Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Cu

Relationship of Ardennite-(As) to other Species

9.BJ.05OrientiteCa2Mn2+Mn23+(Si3O10)(OH)4
9.BJ.10RosenhahniteHCa3[Si3O9(OH)]
9.BJ.15TrabzoniteCa4(Si3O10) · 2H2O
9.BJ.20Thalénite-(Y)Y3Si3O10F
9.BJ.25TiragalloiteMn42+(HAsSi3O13)
9.BJ.30Medaite(Mn,Ca)6(V,As)Si5O18OH
9.BJ.35RuiziteCa2Mn23+[(OH)2|H2Si4O13] · 2H2O
9.BJ.40Ardennite-(V)Mn42+Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6
9.BJ.45KilchoaniteCa6(SiO4)(Si3O10)
9.BJ.50KornerupineMg3Al6(Si,Al,B)5O21(OH)
9.BJ.50Prismatine(◻,Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22
9.BJ.55ZunyiteAl13Si5O20(OH,F)18Cl
9.BJ.60HubeiteCa2Mn2+Fe3+[HSi4O13] · 2H2O
9.BJ.65Cassagnaite(Ca,Mn2+)4(Fe3+,Mn3+,Al)4(V3+,Mg,Al)2(Si3O10)(SiO4)2(OH,O)8
17.7.1SuzukiiteBaVSi2O7
17.7.2FranciscaniteMn62+(V5+,☐)2(SiO4)2(O,OH)6
17.7.3Kurumsakite(Zn,Ni,Cu)8Al8V25+Si5O35 · 27H2O (?)
17.7.5Medaite(Mn,Ca)6(V,As)Si5O18OH
17.7.6JohninnesiteNa2Mn92+Mg7(OH)8[AsO4]2[Si6O17]2
17.7.7TiragalloiteMn42+(HAsSi3O13)
17.7.8DixeniteCuMn142+Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6
17.7.9AsbecasiteCa3(Ti,Sn4+)Be2(AsO3)6(SiO4)2
17.7.10McgoverniteMn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21
17.7.11KraissliteZn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16
17.7.12Schallerite(Mn,Fe)16Si12As3O36(OH)17
17.7.13Nelenite(Mn,Fe)16(Si12O30)(OH)14[As33+O6(OH)3]
17.7.14KoliciteMn72+Zn4(AsO4)2(SiO4)2(OH)8
17.7.15YeatmaniteZn6Mn92+Sb25+(SiO4)4O12
17.7.16WelshiteCa4Mg9Sb3O4[Si6Be3AlFe2O36]
17.7.17Katoptrite(Mn2+,Mg)13(Al,Fe3+)4Sb25+(SiO4)2O20
17.7.18ParweliteMn10Sb2As2Si2O24
17.7.19Långbanite(Mn2+,Ca)4(Mn3+,Fe3+)9Sb5+(SiO4)2O16
17.7.20ChapmaniteFe23+Sb3+(Si2O5)O3(OH)
17.7.21Cervandonite-(Ce)(Ce,Nd,La)(Fe3+,Fe2+,Ti,Al)3O2(Si2O7)(As3+O3)(OH)

Other Names for Ardennite-(As)

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ardennite-(As)

Reference List:
Nayak, V. K. (1967): Ardennite from Kajlidongri, India. New locality. Neues Jahrbuch für Mineralogie, Abhandlungen 1967, 295-304.

Donnay, G. & Allmann, R. (1968): Si3O10 groups in the crystal structure of ardennite. Acta Crystallographica, B24, 845-855.

Pasero M., Reinecke T., Fransolet A. M.(1994) : Crystal structure refinements and compositional control of Mn-Mg-Ca ardennites from the Belgian Ardennes, Greece, and the Western Alps: Neues Jahrbuch für Mineralogie, Monatshefte und Abhandlungen: 166, 137-167.

Pasero, M. & Reinecke, T. (1991): Crystal chemistry, HRTEM analysis, and polytypic behavior of ardennite. Eur. J. Mineral. 3, 819-830.

Barresi, A., Orlandi, P. & Pasero, M. (2007): History of ardennite and the new mineral ardennite-(V). European Journal of Mineralogy, 19, 581-587.

Internet Links for Ardennite-(As)

Localities for Ardennite-(As)

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Belgium
 
  • Luxembourg Province
    • Stavelot Massif
      • Vielsalm
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
Ann.Mines, 4th ser. (1842) 2, 357
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Nagashima, M. and Armbruster, T. (2010): Ardennite, tiragalloite and medaite: structural control of (As5+,V5+,Si4+)O4 tetrahedra in silicates. Mineralogical Magazine 74, 55-71
France
 
  • Rhône-Alpes
    • Savoie
      • Maurienne valley
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
Greece
 
  • Aegean Islands Department (Aiyaíon)
    • Kykládes Prefecture
      • Cyclade Islands (Cyclades; Kikladhes; Nomos Kikladhon)
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
  • Sterea Hellas Department
    • Évvoia Prefecture
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
India
 
  • Madhya Pradesh
    • Jhabua District
Nayak, V. K. (1967): Ardennite from Kajlidongri, India. New locality. Neues Jahrbuch für Mineralogie, Abhandlungen 1967, 295-304.
Italy
 
  • Aosta Valley
    • Nus
      • Saint-Barthélemy
Pelloux, A. (1946): Mineralogy of Aosta Valley. Rend. soc. mineral. ital. 3, 188-206. ; Barresi, A.A., Kolitsch, U., Ciriotti, M.E., Ambrino, P., Bracco, R., Bonacina, E. (2005): La miniera di manganese di Varenche (Aosta, Italia nord-occidentale): ardennite, arseniopleite, manganberzeliite, pirofanite, sarkinite, thortveitite, nuovo As-Sc-analogo della metavariscite e altre specie. Micro (località), 2/2005, 81-122.
  • Lombardy
    • Sondrio Province
      • Valtellina
        • Malenco Valley
          • Torre di Santa Maria
- Bedognè, F., Montrasio, A., Sciesa, E. (1993): I minerali della provincia di Sondrio: Valmalenco. Bettini, Sondrio, 275 pp. - Barresi, A.A., Orlandi, P., Pasero, M. (2007): History of ardennite and the new mineral ardennite-(V). Eur. J. Mineral., 19, 581-587.
  • Piedmont
    • Torino Province
      • Balangero - Corio area
Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
      • Lanzo Valleys
        • Ceres
Maccario,G.& Meda,F.(1970):Il giacimento manganesifero di Vernetto,Ceres.Notiziario del Gruppo Mineralogico Piemontese,2(2),9-10; Nagashima, M. and Armbruster, T. (2010): Ardennite, tiragalloite and medaite: structural control of (As5+,V5+,Si4+)O4 tetrahedra in silicates. Mineralogical Magazine 74, 55-71
Japan
 
  • Honshu Island
    • Kanto Region
      • Gunma Prefecture
        • Tano-gun
          • Oniishi-machi (Onishi-machi)
The Mineral Species of Japan (5th ed) Matsubara
  • Kyushu Region
    • Nagasaki Prefecture
      • Nagasaki City
        • Kinkai-Tone-machi
Sasaki, N., Yano, M. & Matsuyama, F. (2002): Ardennite from the Tone mine, Nagasaki Prefecture, Japan. Chigaku Kenkyu 51, 67-72. (in Japanese)
  • Shikoku Island
    • Kochi Prefecture
Masaki Enami (1986) Mineralogical Journal, 13, 151-160.
      • Nagaoka-gun
The Mineral Species of Japan (5th ed) Matsubara
Minakawa, T., & Momoi, H. (1987). Occurrences of ardennite and sursassite from the metamorphic manganese deposits in the Sanbagawa belt, Shikoku. Japan. Journal of the Mineralogical Society of Japan, 18, 87-98.
    • Tokushima prefecture
Joe Cilen collection No. 21,034
New Zealand
 
  • South Island
    • Otago
      • Queenstown
C. Lemanski, Jr. collection (6782CL).
Republic of Macedonia
 
  • Veles
Schweiz. mineral. petrogr. Mitt. (1994) 74, 321-328; Can.Min.(1996) 34, 1287-1297
Russia
 
  • Northern Region
    • Komi Republic
      • Prepolar Ural
        • Kozhim River Basin
          • Maldynyrd range (Maldy-nyrd range)
            • Grubependity Lake
Pavel M. Kartashov data
Switzerland
 
  • Grischun (Grisons; Graubünden)
    • Albula Valley
      • Oberhalbstein (Surses; Sursass)
        • Tinizong (Tinzen)
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Verlag Wepf & Co. (Basel), p. 49
Geiger T. & Cabalzar W. Ardennit - Ein Neufund von der Alp Parsettens, Val d'Err GR. Schweizer Strahler Nr.5, S. 201 - 211, (1989)
    • Bregaglia Valley (Bergell)
      • Maroz Valley
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Verlag Wepf & Co. (Basel), p. 49; Brugger J. (1996): The Fe, Mn, (V, Sb, As, Be, W) deposits of Val Ferrera (Graubünden, Switzerland). Unpublished PhD Thesis, Univ. Basel. 188 p.
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Verlag Wepf & Co. (Basel), p. 49
    • Engadin
      • Piz Corvatsch
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Verlag Wepf & Co. (Basel), p. 49
UK
 
  • England
    • Somerset
      • Cranmore
Turner, R. (2006): A mechanism for the formation of the mineralized Mn deposits at Merehead Quarry, Cranmore, Somerset, England. Mineralogical Magazine 70, 629-653; Turner R.W. and Rumsey, M.S. (2007) Merehead Mineralogy - an Update. Russell Soc Newsletter, No 50, pp 17-18 (March 2007); Turner, R.W. and Rumsey, M.S. (2010): Mineral Relationships in the Mendip Hills. Journal of the Russell Society, vol 13, pp 3-46.
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