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Pecoraite

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Dr. William Thomas Pecora, Director of the USGS. Served from 1965-1971.
Formula:
Ni3(Si2O5)(OH)4
Colour:
Green, blue-green yellow-green
Lustre:
Waxy, Earthy
Specific Gravity:
3.084
Crystal System:
Monoclinic
Name:
For Dr. William Thomas Pecora (1913-1972) Director of USGS and student of nickel silicate deposits.
Dimorph of:
Kaolinite-Serpentine Group


Hide all sections | Show all sections

Classification of PecoraiteHide

Approved
8/H.27-160
9.ED.15

9 : SILICATES (Germanates)
E : Phyllosilicates
D : Phyllosilicates with kaolinite layers composed of tetrahedral and octahedral nets
71.1.2d.4

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
1 : Sheets of 6-membered rings with 1:1 layers
14.26.2

14 : Silicates not Containing Aluminum
26 : Silicates of Ni

Physical Properties of PecoraiteHide

Waxy, Earthy
Transparency:
Translucent
Colour:
Green, blue-green yellow-green
Density:
3.084 g/cm3 (Measured)    3.47 g/cm3 (Calculated)
Comment:
Measured with absorbed water

Optical Data of PecoraiteHide

Type:
Biaxial (+/-)
RI values:
nα = 1.565 nβ = 1.565 - 1.603 nγ = 1.565 - 1.603
Max Birefringence:
δ = 0.000 - 0.038
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v strong

Chemical Properties of PecoraiteHide

Formula:
Ni3(Si2O5)(OH)4
IMA Formula:
Ni3Si2O5(OH)4
Common Impurities:
Al,Fe,Mg,Ca,H2O

Crystallography of PecoraiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 5.26 Å, b = 9.16 Å, c = 14.7 Å
β = 92°
Ratio:
a:b:c = 0.574 : 1 : 1.605
Unit Cell V:
707.84 ų (Calculated from Unit Cell)
Morphology:
Curved plates, spirals, and tubes, granular, massive.

Type Occurrence of PecoraiteHide

Place of Conservation of Type Material:
Smithsonian 128111
Geological Setting of Type Material:
Weathered meteorite

Synonyms of PecoraiteHide

Other Language Names for PecoraiteHide

German:Pecorait
Simplified Chinese:镍纤蛇纹石
Spanish:Pecoraita
Traditional Chinese:鎳纖蛇紋石

Relationship of Pecoraite to other SpeciesHide

Other Members of this group:
AmesiteMg2Al(AlSiO5)(OH)4Tric. 1 : P1
AntigoriteMg3(Si2O5)(OH)4Mon. m : Bm
Baumite(Mg,Al,Mn,Zn,Fe)3(Si,Al)2O5(OH)4
Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4Mon. m : Bm
Brindleyite(Ni,Al)3(Si,Al)2O5(OH)4Mon.
CaryopiliteMn2+3Si2O5(OH)4Mon.
ChrysotileMg3(Si2O5)(OH)4Mon.
CronstedtiteFe2+2Fe3+((Si,Fe3+)2O5)(OH)4Trig. 3m : P3 1m
Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4Mon.
GuidottiiteMn2Fe3+(Fe3+SiO5)(OH)4Hex. 6 : P63
KellyiteMn2+2Al(AlSiO5)(OH)4Hex.
LizarditeMg3(Si2O5)(OH)4
Népouite(Ni,Mg)3(Si2O5)(OH)4Orth.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Nullaginite5 photos of Pecoraite associated with Nullaginite on mindat.org.
Gaspéite5 photos of Pecoraite associated with Gaspéite on mindat.org.
Millerite4 photos of Pecoraite associated with Millerite on mindat.org.
Talc2 photos of Pecoraite associated with Talc on mindat.org.
Serpentine Subgroup2 photos of Pecoraite associated with Serpentine Subgroup on mindat.org.
Rammelsbergite1 photo of Pecoraite associated with Rammelsbergite on mindat.org.
Willemseite1 photo of Pecoraite associated with Willemseite on mindat.org.
Nickeline1 photo of Pecoraite associated with Nickeline on mindat.org.
Silver1 photo of Pecoraite associated with Silver on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.ED.ClinochrysotileMon. 2/m
9.ED.05DickiteAl2(Si2O5)(OH)4Mon. m : Bb
9.ED.05KaoliniteAl2(Si2O5)(OH)4Tric. 1 : P1
9.ED.05NacriteAl2(Si2O5)(OH)4Mon. m : Bb
9.ED.05Odinite(Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4Mon. m : Bm
9.ED.10HalloysiteAl2(Si2O5)(OH)4Mon. m : Bb
9.ED.10HisingeriteFe3+2(Si2O5)(OH)4 · 2H2OMon.
9.ED.10Halloysite-7ÅAl2(Si2O5)(OH)4Mon. m
9.ED.15AmesiteMg2Al(AlSiO5)(OH)4Tric. 1 : P1
9.ED.15AntigoriteMg3(Si2O5)(OH)4Mon. m : Bm
9.ED.15Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4Mon. m : Bm
9.ED.15Brindleyite(Ni,Al)3(Si,Al)2O5(OH)4Mon.
9.ED.15CaryopiliteMn2+3Si2O5(OH)4Mon.
9.ED.15ChrysotileMg3(Si2O5)(OH)4Mon.
9.ED.15CronstedtiteFe2+2Fe3+((Si,Fe3+)2O5)(OH)4Trig. 3m : P3 1m
9.ED.15Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4Mon.
9.ED.15Greenalite(Fe2+,Fe3+)2-3Si2O5(OH)4Mon.
9.ED.15KellyiteMn2+2Al(AlSiO5)(OH)4Hex.
9.ED.15LizarditeMg3(Si2O5)(OH)4
9.ED.15ManandoniteLi2Al4(Si2AlB)O10(OH)8Orth.
9.ED.15Népouite(Ni,Mg)3(Si2O5)(OH)4Orth.
9.ED.15GuidottiiteMn2Fe3+(Fe3+SiO5)(OH)4Hex. 6 : P63
9.ED.20Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2OAmor.
9.ED.20ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2OOrth.
9.ED.20ImogoliteAl2SiO3(OH)4
9.ED.20Neotocite(Mn,Fe,Mg)SiO3 · H2OAmor.
9.ED.25BismutoferriteFe3+2Bi(SiO4)2(OH)Mon. m : Bm
9.ED.25ChapmaniteFe3+2Sb3+(Si2O5)O3(OH)Mon. m : Bm

Related Minerals - Dana Grouping (8th Ed.)Hide

71.1.2d.1ClinochrysotileMon. 2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.26.1Liebenbergite(Ni,Mg)2SiO4Orth.
14.26.3Népouite(Ni,Mg)3(Si2O5)(OH)4Orth.
14.26.4WillemseiteNi3Si4O10(OH)2Mon.
14.26.5Karpinskite(Ni,Mg)2Si2O5(OH)2 (?)
14.26.6Falcondoite(Ni,Mg)4Si6O15(OH)2 · 6H2OOrth.

Other InformationHide

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 PecoraiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1969): 54: 1740.
Neues Jahrbuch für Mineralogie, Monatshefte (1983): 11: 513-523.

Internet Links for PecoraiteHide

Localities for PecoraiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • Tasmania
    • Waratah-Wynyard municipality
      • Heazlewood district
Anderson, P., Bottrill, R. & Davidson, P. (2002): Famous mineral localities: The Lord Brassey mine, Tasmania. Mineralogical Record 33, 321-332
  • Western Australia
    • Coolgardie Shire
      • Kambalda
        • Kambalda Nickel mines
          • Juan complex
Mineralogical Magazine 1981 44 : 333-337.
      • Widgiemooltha
Nickel E H, Robinson B W, Mumme W G (1993) Widgiemoolthalite: the new Ni analogue of hydromagnesite from Western Australia. American Mineralogist 78, 819-821; Clissold, M. E. (2007) Aspects of the Supergene Geochemistry of Copper, Nickel and Bismuth. PhD Thesis University of Sydney, Australia 162pp.
    • East Pilbara Shire
      • Nullagine
Nickel, E. H.; Hallbert, J. A.; Halligan, R. (1979): Unusual nickel mineralization at Nullagine, Western Australia. Journal of the Geological Society of Australia 26, 61-71.
    • Halls Creek Shire
      • Carranya Station
MM 44 (1981), 153; HB2/2 (1995); Song, Y., Moon, H. S., & Chon, H. T. (1995). New occurrence and characterization of Niserpentines in the Kwangcheon area, Korea. Clay Minerals, 30(3), 211-224.
    • Menzies Shire
      • Menangina Station
Mineralogical Magazine 1981 44 : 333-337.; Matthew J. Sciberras, Peter Leverett, Peter A. Williams, David E. Hibbs, Peter J. Downes, Mark D. Welch and Anthony R. Kampf (2013) Paratacamite-(Ni,Cu3(Ni,Cu)Cl2(OH)6, a new mineral from the Carr Boyd Rocks mine, Western Australia. Australian Journal of Mineralogy 17:39-44
Canada
 
  • Québec
    • Estrie
      • Le Val-Saint-François RCM
        • St-Denis-de-Brompton
Tarassoff, P. (1994). "Famous mineral localities: The Orford nickel mine, Québec, Canada." Mineralogical Record, 25(5),pp:327-345.
Dominican Republic
 
  • Monseñor Nouel Province
    • Bonao
M.E. Ciriotti (Steffen Moeckel analysis) 06/09/2007
France
 
  • Provence-Alpes-Côte d'Azur
    • Alpes-Maritimes
      • Guillaumes
        • Daluis
[MinRec 32:312]
Germany
 
  • Saxony
    • Vogtland
      • Plauen
        • Jocketa-Neuensalz District
          • Jocketa
M Adelt collection
          • Röttis
Andreas Gerstenberg collection
      • Reichenbach
        • Limbach
Tröger, S. (2012): Der Steinbruch Reimersgrün im Sächsischen Vogtland. Lapis 37 (10), 32-39.
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Lavrion (Laurion; Laurium)
Möckel, S. (2000): Strashimirit und 11 weitere Neubestimmungen aus Lavrion (GR). Lapis 25 (7-8), 74.
Italy
 
  • Lombardy
    • Sondrio Province
      • Valtellina
Lapis, 19 (10), 15-21+86.
          • Lanterna Valley
            • Lanzada
              • Campo Franscia (Franscia)
Bedognè, F., Montrasio, A., Sciesa, E. (1993) I minerali della provincia di Sondrio: Valmalenco. Bettini, Sondrio, 275 pp.
              • Campo Moro Valley
Bedognè, F., Montrasio, A., Sciesa, E. (1993) I minerali della provincia di Sondrio: Valmalenco. Bettini, Sondrio, 275 pp.
Bedognè, F., Montrasio, A., Sciesa, E. (2006) I minerali della media-alta Valtellina, delle Orobie valtellinesi e della Val Poschiavo. Aggiornamenti sulle altre località della provincia di Sondrio. Bettini, Sondrio, 255 pp.; Bedogné, F., Montrasio, A., Sciesa, E. (1993) I minerali della provincia di Sondrio: Valmalenco. Bettini, Sondrio, 275 pp.
          • Torre di Santa Maria
Guicciardi, G. (1980) Guida ai minerali della Val Malenco. Ed. Calderini, Bologna, 60 pp.
  • Tuscany
    • Lucca Province
      • Apuan Alps
        • Stazzema
          • Ponte Stazzemese
Orlandi, P. (2011): Zibaldone di mineralogia italiana 2010. Micro, 1/2011, 39-42
Morocco
 
  • Drâa-Tafilalet Region
    • Ouarzazate Province
      • Tazenakht
        • Bou Azzer District (Bou Azer District)
Gunnar Farber specimens (with nickeltalmessite)
New Caledonia
 
  • Northern Province
    • Houaïlou Commune
Berger, V.I., Singer, D.A., Bliss, J.D., and Moring, B.C., 2011, Ni-Co laterite deposits of the world; database and grade and tonnage models: U.S. Geological Survey Open-File Report 2011-1058.
    • Poya North Commune
Berger, V.I., Singer, D.A., Bliss, J.D., and Moring, B.C., 2011, Ni-Co laterite deposits of the world; database and grade and tonnage models: U.S. Geological Survey Open-File Report 2011-1058.
Russia
 
www.minsocam.org/msa/Handbook/Pecoraite.PDF.
    • Middle Urals
      • Sverdlovskaya Oblast'
        • Rezh District
          • Lipovka pegmatite field
P.M. Kartashov data
        • Serov District
          • Kola massif
Talovina, I.V., Lazarenkov, V.G., Ryzhkova, S.O., Ugol'kov, V.L., and Vorontsova, N.I. (2008): Lithology and Mineral Resources 43(6), 588-595.
    • Southern Urals
      • Chelyabinsk Oblast'
        • Ufaley District (Ufalei District)
Talovina, I.V., Lazarenkov, V.G., Ryzhkova, S.O., Ugol'kov, V.L., and Vorontsova, N.I. (2008): Lithology and Mineral Resources 43(6), 588-595.; Berger, V.I., Singer, D.A., Bliss, J.D., and Moring, B.C., 2011, Ni-Co laterite deposits of the world; database and grade and tonnage models: U.S. Geological Survey Open-File Report 2011-1058.
Talovina, I.V., Lazarenkov, V.G., Ryzhkova, S.O., Ugol'kov, V.L., and Vorontsova, N.I. (2008): Lithology and Mineral Resources 43(6), 588-595.
Talovina, I.V., Lazarenkov, V.G., and Vorontsova, N.I. (2003): Lithology and Mineral Resources 38(5), 403-415.
South Africa
 
  • Mpumalanga Province
    • Ehlanzeni District
      • Barberton
        • Kaapsche Hoop (Kaapsehoop)
Minerals of South Africa
South Korea
 
  • Gyeonggi-do (Kyonggi-do)
    • Gwancheon city (Kwancheon)
[AmMin 84:687]; Song, Y., Moon, H. S., & Chon, H. T. (1995). New occurrence and characterization of Niserpentines in the Kwangcheon area, Korea. Clay Minerals, 30(3), 211-224.
Song, Y., Moon, H. S., & Chon, H. T. (1995). New occurrence and characterization of Niserpentines in the Kwangcheon area, Korea. Clay Minerals, 30(3), 211-224.
USA
 
  • Arizona
    • Cochise Co.
      • Dragoon Mts
        • Turquoise District (Courtland-Gleeson District)
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 323.
  • California
    • San Benito Co.
      • Diablo Range
        • New Idria District
          • Idria (New Idria)
No reference listed
          • Picacho Peak
Mineralogical Record: 36(4): 337-363.
    • Sonoma Co.
      • Mayacmas Mts (Mayacamas Mts)
        • West Mayacmas District
          • Cloverdale
            • North Fork Little Sulphur Creek
Tim Greenland (2011) Trip to the Culver-Baer mine, N fork of Sulphur creek, Cloverdale, Mayacmas mts, Sonoma Co., CA, USA. http://www.minresco.com/links/field%20trips/field_trip_info/Culver%20Baer%20Trip.pdf
  • Michigan
    • Marquette Co.
George W. Robinson and S.M. Carlson (2009) What's New in Michigan Minerals. Presentation at The 36th Rochester Mineralogical Symposium, April 23-26, 2009.
  • Missouri
www.gswweb.org/minutes/GSW1980.htm
R&M 73:2 pp 98-117
R&M 73:2 pp 98-117
  • New York
    • Jefferson Co.
      • Antwerp
George Robinson & Steven Chamberlain (2007) Gazetteer of major New York State mineral localities. Rocks & Minerals, 82, #6, 472-483.; George Robinson & Steven Chamberlain (2007) Gazetteer of major New York State mineral localities. Rocks & Minerals, 82, #6, 472-483.
  • Oregon
    • Douglas Co.
      • Riddle District
        • Riddle
www.minsocam.org/msa/Handbook/Pecoraite.PDF.
  • Vermont
    • Orleans & Lamoille Cos.
      • Lowell & Eden
Rocks & Min. Vol. 71, (1996)
Mineral and/or Locality  
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