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Ottrélite

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Ottrélite

Ottré, Vielsalm, Stavelot Massif, Luxembourg Province, Belgium
Ottrélite

Ottré, Vielsalm, Stavelot Massif, Luxembourg Province, Belgium
Ottrélite

Ottré, Vielsalm, Stavelot Massif, Luxembourg Province, Belgium
Ottrélite

Ottré, Vielsalm, Stavelot Massif, Luxembourg Province, Belgium
Ottrélite

Ottré, Vielsalm, Stavelot Massif, Luxembourg Province, Belgium
Ottrélite

Ottré, Vielsalm, Stavelot Massif, Luxembourg Province, Belgium
Ottrélite

Ottré, Vielsalm, Stavelot Massif, Luxembourg Province, Belgium
Ottrélite

Ottré, Vielsalm, Stavelot Massif, Luxembourg Province, Belgium
The quarry in 2014

Pagani quarry, Ottré, Vielsalm, Stavelot Massif, Luxembourg Province, Belgium
Formula:
(Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2
System:
Monoclinic
Colour:
Pistachio-green, ...
Hardness:
6 - 7
Name:
Named by A. Descloizeaux and A.A. Damour in 1842 for the type locality of Ottré, Belgium.
Mn analogue of chloritoid. Ottrélite was originally described as a Mn-rich, but not necessarily Mn-dominant chloritoid, consequently many "ottrélites" are in reality Mn-rich chloritoids, see Chloritoid best minerals article and references therein for further details.

Monoclinic and triclinic polytypes are known.


Classification of Ottrélite

IMA status:
Approved, 'Grandfathered' (first described prior to 1959)
Strunz 8th ed.:
8/B.24-30
Nickel-Strunz 10th (pending) ed.:
9.AF.85

9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
Dana 8th ed.:
52.3.3.3

52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
3 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
Hey's CIM Ref.:
16.16.21

16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn

Physical Properties of Ottrélite

Colour:
Pistachio-green, greenish to dark grey
Streak:
Greenish, greyish
Hardness (Mohs):
6 - 7

Optical Data of Ottrélite

Type:
Biaxial (+)
RI values:
nα = 1.709 - 1.725 nβ = 1.712 - 1.726 nγ = 1.716 - 1.732
2V:
Measured: 46° to 70°, Calculated: 46° to 82°
Max Birefringence:
δ = 0.007
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v strong

Chemical Properties of Ottrélite

Formula:
(Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2
IMA Formula:
Mn2+Al2O(SiO4)(OH)2
Elements listed in formula:
Al, H, Mn, O, Si - search for minerals with similar chemistry
Common Impurities:
Ca,H2O

Crystallography of Ottrélite

Crystal System:
Monoclinic
Cell Parameters:
a = 9.505(6) Å, b = 5.484(4) Å, c = 18.214(15) Å
β = 101.77(3)°
Ratio:
a:b:c = 1.733 : 1 : 3.321
Unit Cell Volume:
V 929.45 ų (Calculated from Unit Cell)
Twinning:
Polysynthetic, parallel to [001].
Comment:
Space group Cc or C2/c. Pseudohexagonal.

Type Occurrence of Ottrélite

Type Locality:
ⓘ Ottré, Vielsalm, Stavelot Massif, Luxembourg Province, Belgium

Relationship of Ottrélite to other Species

Member of:
Chloritoid Group
Other Members of Group:
CarboiriteFeAl2(GeO4)O(OH)2
Chloritoid(Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2
MagnesiochloritoidMgAl2(SiO4)O(OH)2
Related Minerals - Nickel-Strunz Grouping):
9.AF.05SillimaniteAl2(SiO4)O
9.AF.10AndalusiteAl2(SiO4)O
9.AF.10KanonaiteMn3+Al(SiO4)O
9.AF.15KyaniteAl2(SiO4)O
9.AF.20MulliteAl4+2xSi2-2xO10-x
9.AF.20Krieselite(Al,Ga)2(GeO4)(OH)2
9.AF.23BoromulliteAl9BSi2O19
9.AF.25YoderiteMg(Al,Fe3+)3(SiO4)2O(OH)
9.AF.30MagnesiostauroliteMg(Mg,Li)3(Al,Mg)18Si8O44(OH)4
9.AF.30StauroliteFe22+Al9Si4O23(OH)
9.AF.30ZincostauroliteZn2Al9Si4O23(OH)
9.AF.35TopazAl2(SiO4)(F,OH)2
9.AF.40NorbergiteMg3(SiO4)(F,OH)2
9.AF.45AlleghanyiteMn52+(SiO4)2(OH)2
9.AF.45Chondrodite(Mg,Fe2+)5(SiO4)2(F,OH)2
9.AF.45ReinhardbraunsiteCa5(SiO4)2(OH,F)2
9.AF.45KumtyubeiteCa5(SiO4)2F2
9.AF.45HydroxylchondroditeMg5(SiO4)2(OH)2
9.AF.50Humite(Mg,Fe2+)7(SiO4)3(F,OH)2
9.AF.50Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2
9.AF.50Unnamed (Ca-analogue of Humite)Ca7(SiO4)4F2
9.AF.55ClinohumiteMg9(SiO4)4F2
9.AF.55SonoliteMn92+(SiO4)4(OH)2
9.AF.55HydroxylclinohumiteMg9(SiO4)4(OH)2
9.AF.60LeucophoeniciteMn72+(SiO4)3(OH)2
9.AF.65Ribbeite(Mn2+,Mg)5(SiO4)2(OH)2
9.AF.70JerrygibbsiteMn92+(SiO4)4(OH)2
9.AF.75FranciscaniteMn62+(V5+,☐)2(SiO4)2(O,OH)6
9.AF.75ÖrebroiteMn32+(Sb5+,Fe3+)(SiO4)(O,OH)3
9.AF.75WeliniteMn62+(W6+,Mg)2(SiO4)2(O,OH)6
9.AF.80EllenbergeriteMg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10
9.AF.85Chloritoid(Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2
9.AF.85MagnesiochloritoidMgAl2(SiO4)O(OH)2
9.AF.90PoldervaartiteCaCa[SiO3(OH)](OH)
9.AF.90OlmiiteCaMn2+[SiO3(OH)](OH)
Related Minerals - Hey's Index Grouping:
16.16.1KanonaiteMn3+Al(SiO4)O
16.16.2SpessartineMn32+Al2(SiO4)3
16.16.3DavreuxiteMnAl6Si4O17(OH)2
16.16.4SursassiteMn22+Al3(SiO4)(Si2O7)(OH)3
16.16.5CarpholiteMn2+Al2(Si2O6)(OH)4
16.16.6KellyiteMn22+Al(AlSiO5)(OH)4
16.16.7PennantiteMn52+Al(AlSi3O10)(OH)8
16.16.8AkatoreiteMn92+Al2Si8O24(OH)8
16.16.9Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
16.16.10Mangano-ferri-eckermannite[Na][Na2][Mn42+(Fe3+)]Si8O22(OH)2
16.16.11Masutomilite(K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2
16.16.13HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13
16.16.14Eggletonite(Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2O
16.16.15Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O
16.16.16Taneyamalite(Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44
16.16.17ZussmaniteK(Fe,Mg,Mn)13(Si,Al)18O42(OH)14
16.16.18CoombsiteK(Mn,Fe,Mg)13(Si,Al)18O42(OH)14
16.16.19HenritermieriteCa3(Mn3+,Al)2(SiO4)2(OH)4
16.16.20MacfalliteCa2Mn33+(SiO4)(Si2O7)(OH)3
16.16.22Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
16.16.23OkhotskiteCa2(Mn,Mg)(Mn3+,Al,Fe3+)2(Si2O7)(SiO4)(OH)2 · H2O
16.16.24Pumpellyite-(Mn2+)Ca2Mn2+Al2(Si2O7)(SiO4)(OH)2 · H2O
16.16.25Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)

Other Names for Ottrélite

Synonyms:

Newportite

Name in Other Languages:
Afrikaans:Ottrélite
Simplified Chinese:粒硬绿泥石

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 Ottrélite

Reference List:
Descloizeaux, A., Damour A.A. (1842) De l'ottrélite. Nouvelle espèce minérale. Annales des Mines: 2: 357-361.

Hutchings, W.M. (1889) On the Occurrence of Ottrelite in the Phyllites of North Cornwall. Geological Magazine (Decade III): 6(5): 214-220.

Spencer, L.J. (1898) Supplementary list of British minerals. Mineralogical Abstracts: 30: 285.

Halferdahl, L.B. (1961) Chloritoid: its composition, X-ray and optical properties, stability and occurrences. Journal of Petrology: 2: 49-135.

Fransolet, A.-M. (1978) Données nouvelles sur l'ottrélite d'Ottré, Belgique. Bulletin de la Société française de Minéralogie et de Cristallographie: 101: 548-557.

Theye, T., Fransolet, A.-M. (1994) Virtually pure ottrelite from the region of Ottré, Belgium. European journal of mineralogy: 6(4): 547-555.

Fransolet, A.-M., Theye, T. (1997) On the Ardennes chloritoids and the ottrelite term (Cambrian, Belgium-French): A comment.
Neues Jahrbuch fur Mineralogie Monatshefte: 328-331.

Internet Links for Ottrélite

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    Localities for Ottrélite

    This 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
     
    • Liège Province
      • Stavelot Massif
        • Lienne valley
          • Stoumont
    • Luxembourg Province
      • Bastogne
      • Stavelot Massif
    		Michel Bloindieau
    Hatert, F., Deliens, M., Fransolet, A.-M. & van der Meersche, E. (2002): Les minéraux de Belgique. 2ème édition, Muséum des Sciences Naturelles, Bruxelles, Ed., 304 p.
          • Cahai (Cahay)
    		Frank de Wit collection
    Descloizeux & Damour (1842): De l'Ottrelite. Nouvelle espèce minérale. Annales des Mines. 4eme Serie, Tome II, 357-361
    Canada
     
    • Québec
      • Abitibi-Témiscamingue
        • Abitibi-Ouest RCM
          • Normetal
    		Sabina, A.P. (2003): Rocks & Minerals for the collector; Kirkland Lake - Rouyn-Noranda - Val d'Or, Ontario & Quebec. GSC Misc. Report 77, 92p.
        • Rouyn-Noranda TE
    		Sabina (2003) 66.
      • Chaudière-Appalaches
        • Broughton
    		Système d'information géominière du Québec:
        • Les Appalaches RCM
    		Harvard Museum of Natural History
    France
     
    • Occitanie
      • Gard
        • Trèves
          • Mas Aubert
    		R.C. Maury and P. Picot : "Conditions d'Apparition du Fer Natif dans une Enclave de Schistes Graphiteux d'une Basanite des Cévennes", Bulletin de Minéralogie, 1979, Vol. 102, N° 4, 326-332
    Germany
     
    • Bavaria
      • Upper Palatinate
        • Lam
    		Geotopkataster database, Bayerisches Landesamt für Umwelt
    • Saxony-Anhalt
      • Harz
    		Lapis 15(7/8), 59-60 (1990)
    Italy
     
    • Piedmont
      • Torino Province
        • Susa Valley
          • Bussoleno
            • Tignai
    		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.
    • Tuscany
      • Massa-Carrara Province
        • Apuan Alps
          • Massa
    Mexico
     
    • Michoacan
      • Mun. de Coalcomám
    		Ref.: Revista Mexicana de Ciencias Geológicas, volumen 17, número 2, p.143-153 (2000)
    Sweden
     
    • Dalarna
      • Smedjebacken
    		GFF 20, 50
    • Skåne
      • Bromölla
        • Näsum
    		Sandstöm, F. (2007): Västanåfeltets geologi och mineralogi. Litiofilen 24 (2): 14-38
      • Kristianstad
        • Vånga
    		Swedish Nat.Musuem ( O.Gabrielson)
    • Värmland
      • Munkfors
        • Ransäter
    		No reference listed
    USA
     
    • California
      • Inyo Co.
        • Panamint Mts (Panamint Range)
          • South Park District
    		Murphy, Franklin Mac (1932), Geology of a part of the Panamint Range, California Calif. Min Bureau Report 28: 347; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 137; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 436.
      • Siskiyou Co.
        • Yreka
    		Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 137.
    • Maryland
      • Frederick Co.
        • Libertytown
    		Dana 6:1071.
    • Massachusetts
      • Worcester Co.
        • Sterling
    		Emerson, 1917. Geology of Mass. & Rhode Island, p.61
    • New Mexico
      • Sierra Co.
    		Minerals of New Mexico 3rd ed.
    • North Carolina
        • Marble
    		Wilson,W.F and McKenzie, B.J.,1978, Mineral Collecting Sites in North Carolina,Information Circular 24
      • Moore Co.
        • Glendon District
    		Rocks & Min.: 60: 92.
        • Robbins District
          • Cabin Creek
    		Rocks & Min.: 60:92.
      • Randolph Co.
    		Wilson,W.F and McKenZie,B.J,1978,Mineral Collecting Sites in North Carolina, Information Circular 24
        • Staley
    		Rocks & Min.:60:93.
    • Rhode Island
      • Newport Co.
    		AmMin 12:427-436 (1927)
    Fisher, L.W. and Doll, C.G. (1927) Notes on the mineral localities of Rhode Island. American Mineralogist, 12, 427-436
    Miller, 1971. RI Minerals & Their Locations
    AmMin 12:427-436
      • Providence Co.
        • Cranston
          • Arlington
        • Providence
    		Museum of Natural History, Roger Williams Park, Providence, R.I. G4196 6395
    • South Carolina
      • Cherokee Co.
        • Kings Mountain District
    		U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    • South Dakota
      • Lawrence Co.
    		SDSMT Bull 18 Roberts and Rapp "Mineralogy of the Black Hills"
    • Virginia
      • Bedford Co.
    		Minerals of Virginia 1990 by R. V. Dietrich
    Mineral and/or Locality  
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