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Pecoraite

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Nullagine, Western Australia, Australia
© Martin Patus

Show Pecoraite Photos (2)
Formula:
Ni
 
3
[(OH)
 
4
|Si
 
2
O
 
5
]
System:MonoclinicColour:Green, blue-green ...
Name:
For Dr. William Thomas Pecora (1913-1972) Director of USGS and student of nickel silicate deposits.
Dimorph of:Népouite


Kaolinite-Serpentine Group

Classification of Pecoraite

IMA status:Approved
Strunz 8th edition ID:8/H.27-160
Nickel-Strunz 10th (pending) edition ID:9.ED.15

9 : SILICATES (Germanates)
E : Phyllosilicates
D : Phyllosilicates with kaolinite layers composed of tetrahedral and octahedral nets
Dana 8th edition ID:71.1.2d.4

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
1 : Sheets of 6-membered rings with 1:1 layers
Hey's CIM Ref.:14.26.2

14 : Silicates not Containing Aluminum
26 : Silicates of Ni
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Type Occurrence of Pecoraite

Type Locality:Wolf Creek meteorite crater, Western Australia, Australia
Place of Conservation of Type Material:Smithsonian 128111
Year of Discovery:1969
Geological Setting of type material:Weathered meteorite

Occurrences of Pecoraite

Geological Setting:Shears in ultramafic rocks, weathering product of millerite in geodes.

Physical Properties of Pecoraite

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

Crystallography of Pecoraite

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

Optical Data of Pecoraite

Type:Biaxial (+/-)
RI values: nα = 1.565 nβ = 1.565 - 1.603 nγ = 1.565 - 1.603
Maximum Birefringence:δ = 0.000 - 0.038

Chart 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 Pecoraite

Formula:
Ni
 
3
[(OH)
 
4
|Si
 
2
O
 
5
]
Essential elements:H, Ni, O, Si
All elements listed in formula:H, Ni, O, Si
Common Impurities:Al,Fe,Mg,Ca,H2O

Relationship of Pecoraite to other Species

Member of:Serpentine Group
Related Minerals - Nickel-Strunz Grouping):

- +
9.ED.05Dickite
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
9.ED.05Kaolinite
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
9.ED.05Nacrite
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
9.ED.05Odinite
(Fe,Mg,Al,Fe,Ti,Mn)
 
2.4
(Si,Al)
 
2
O
 
5
(OH)
 
4
9.ED.10Halloysite
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
9.ED.10Hisingerite
Fe
3+
2
Si
 
2
O
 
5
(OH)
 
4
·2H
 
2
O
9.ED.10Halloysite-7Å
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
9.ED.15Amesite
Mg
 
2
Al[(OH)
 
4
|AlSiO
 
5
]
9.ED.15Antigorite
(Mg,Fe
2+
 
)
 
3
[(OH)
 
4
|Si
 
2
O
 
5
]
9.ED.15Berthierine
(Fe,Fe,Mg)
 
2-3
(Si,Al)
 
2
O
 
5
(OH)
 
4
9.ED.15Brindleyite
(Ni,Mg,Fe)
 
2
Al(Si,Al)O
 
5
(OH)
 
4
9.ED.15Caryopilite
(Mn,Mg)
 
3
Si
 
2
O
 
5
(OH)
 
4
9.ED.15Chrysotile
Mg
 
3
Si
 
2
O
 
5
(OH)
 
4
9.ED.15Cronstedtite
Fe
2+
2
Fe
3+
 
[(Si,Fe
3+
 
)
 
2
O
 
5
](OH)
 
4
9.ED.15Fraipontite
(Zn,Al)
 
3
[(OH)
 
4
|(Si,Al)
 
2
O
 
5
]
9.ED.15Greenalite
Fe
 
2-3
Si
 
2
O
 
5
(OH)
 
4
9.ED.15Kellyite
Mn
2+
2
Al[(OH)
 
4
|AlSiO
 
5
]
9.ED.15Lizardite
Mg
 
3
[(OH)
 
4
|Si
 
2
O
 
5
]
9.ED.15Manandonite
LiAl
 
4
Si
 
3
BO
 
10
(OH)
 
6
9.ED.15Népouite
(Ni,Mg)
 
3
Si
 
2
O
 
5
(OH)
 
4
9.ED.20Allophane
(Al
 
2
O
 
3
)(SiO
 
2
)
 
1.3-2
·2.5-3H
 
2
O
9.ED.20Chrysocolla
(Cu,Al)
 
2
H
 
2
Si
 
2
O
 
5
(OH)
 
4
·nH
 
2
O
9.ED.20Imogolite
Al
 
2
SiO
 
3
(OH)
 
4
9.ED.20Neotocite
(Mn,Fe,Mg)SiO
 
3
·H
 
2
O
9.ED.25Bismutoferrite
Fe
3+
2
Bi[OH|(SiO
 
4
)
 
2
]
9.ED.25Chapmanite
Fe
3+
2
Sb
3+
 
[OH|(SiO
 
4
)
 
2
]
Related Minerals - Hey's Index Grouping:

- +
14.26.1Liebenbergite
(Ni,Mg)
 
2
[SiO
 
4
]
14.26.3Népouite
(Ni,Mg)
 
3
Si
 
2
O
 
5
(OH)
 
4
14.26.4Willemseite
(Ni,Mg)
 
3
Si
 
4
O
 
10
(OH)
 
2
14.26.5Karpinskite
(Ni,Mg)
 
2
Si
 
2
O
 
5
(OH)
 
2
14.26.6Falcondoite
(Ni,Mg)
 
4
Si
 
6
O
 
15
(OH)
 
2
·6H
 
2
O

Other Names for Pecoraite

Synonyms:
IMA1969-005
Other Languages:
German:Pecorait
Spanish:Pecoraita

Other Information

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

References for Pecoraite

Reference List:American Mineralogist (1969): 54: 1740.

Neues Jahrbuch für Mineralogie, Monatshefte (1983): 11: 513-523.

Internet Links for Pecoraite

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  • Raman and XRD data at RRUFF project
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    Localities for Pecoraite

    Hide Locality List
    The 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. ? 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.
    Australia
     
    • Tasmania
      • 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 deposit
            • Otter Juan mine
    		Mineralogical Magazine 1981 44 : 333-337.
      • Goldfields-Esperance region
        • Kalgoorlie-Boulder City
          • Goongarrie
    		Mineralogical Magazine 1981 44 : 333-337.
      • Pilbara Region
        • 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.
      • Widgiemooltha
    		No reference listed
    MM 44 (1981), 153; HB2/2 (1995)
    Canada
     
    • Québec
      • Estrie
        • Le Val-Saint-François RCM
          • St-Denis-de-Brompton
    		No reference listed
    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
    		M Adelt collection
    Italy
     
    • Lombardy
      • Sondrio Province
    		Lapis, 19 (10), 15-21+86.
    Korea
     
    • Kwancheon
    		[AmMin 84:687]
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
        • Tazenakht
          • Bou Azzer District
    		Gunnar Farber specimens (with nickeltalmessite)
    Russia
     
    www.minsocam.org/msa/Handbook/Pecoraite.PDF.
      • Middle Urals
        • Ekaterinburgskaya (Sverdlovskaya) Oblast'
          • Rezh District
    		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 (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.
    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
      • Barberton District
        • Kaapsche Hoop (Kaapsehoop)
    		Minerals of South Africa
    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
    		Mineralogical Record: 36(4): 337-363.
            • Idria
    		No reference listed
      • Sonoma Co.
        • Cloverdale
    • 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.
      • St Lawrence Co.
        • Antwerp
    • 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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