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Pecoraite Mineral Data

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General Pecoraite Information

Help on Chemical  Formula: Chemical Formula: Ni3Si2O5(OH)4
Help on Composition: Composition: Molecular Weight = 380.27 gm
   Silicon   14.77 %  Si   31.60 % SiO2
   Nickel    46.30 %  Ni   58.92 % NiO
   Hydrogen   1.06 %  H     9.48 % H2O
   Oxygen    37.87 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ni3SI2O5(OH)4
Help on Environment: Environment: Formed by weathering of Ni-Fe meteorite fragments in a desert environment.
Help on IMA Status: IMA Status: Approved IMA 1969
Help on Locality: Locality: In the Wolf Creek meteorite. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for William Thomas Pecora (1913-1972), Director of the U.S. Geological Survey, geologist and student of nickel silicate deposits.
Help on Name Pronunciation: Name Pronunciation: Pecoraite + Pronunciation Say PECORAITE
Help on Synonym: Synonym: Chrysotile - (Ni bearing)
 

Pecoraite Image

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  Pecoraite

Comments: Dark green massive pecoraite in matrix.
Location: Nullagin, Western Australia, Australia. Scale: Specimen Size 2x2.5 cm.
© Diederik Visser

Pecoraite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5742:1:1.6048
Help on Cell Dimensions: Cell Dimensions: a = 5.26, b = 9.16, c = 14.7, Z = 4; beta = 92° V = 707.84 Den(Calc)= 3.57
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.43(1), 1.529(0.8), 3.66(0.8),
 

Physical Properties of Pecoraite

Help on Color: Color: Dark green.
Help on Density: Density: 3.84 - 3.084, Average = 3.46
Help on Diaphaneity: Diaphaneity: Translucent
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Streak: Streak: light green
 

Optical Properties of Pecoraite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.173 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.198 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1618,KPDmeas= 0.1669,KC= 0.2017
Ncalc = 1.62 - 1.77
Help on Optical Data: Optical Data: Biaxial (+/-), a=1.565, b=1.565-1.603, g=1.565-1.603, bire=0.0000-0.0380, 2V(Calc)=0, 2V(Meas)=0.
 

Calculated Properties of Pecoraite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.42 gm/cc
note: Specific Gravity of Pecoraite =3.46 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEPecoraite = 18.77 barns/electron
U=PEPecoraite x rElectron Density= 64.27 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pecoraite is Not Radioactive
 

Pecoraite Classification

Help on  Dana Class: Dana Class: 71.01.02d.04 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.01)with 1:1 layers
  (71.01.02d)Serpentine group (Chrysotile subgroup)
 
71.01.02d.00 Chrysotile! Mg3Si2O5(OH)4 A2/m 2/m
 
71.01.02d.01 Clinochrysotile? Mg3Si2O5(OH)4 Cc, C 2/m Mono
 
71.01.02d.02 Orthochrysotile? Mg3Si2O5(OH)4 Unk Ortho
 
71.01.02d.03 Parachrysotile? Mg3Si2O5(OH)4 Unk Ortho
 
71.01.02d.04 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.ED.15 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.ED -Phyllosilicates with kaolinite layers
 
09.ED.15 Clinochrysotile? Mg3Si2O5(OH)4 Cc, C 2/m Mono
 
09.ED.15 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m
 
09.ED.15 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2
 
09.ED.15 Amesite Mg2Al(SiAl)O5(OH)4 C1 1
 
09.ED.15 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m
 
09.ED.15 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono
 
09.ED.15 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m
 
09.ED.15 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 31m 3m
 
09.ED.15 Chrysotile Mg3Si2O5(OH)4 A2/m 2/m
 
09.ED.15 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2
 
09.ED.15 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono
 
09.ED.15 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 63 6
 
09.ED.15 Maufite? (Mg,Ni)Al4Si3O13•4(H2O)(?) Mono ? Mono
 
09.ED.15 Lizardite Mg3Si2O5(OH)4 P1 1
 
09.ED.15 Orthochrysotile? Mg3Si2O5(OH)4 Unk Ortho
 
09.ED.15 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1
 
09.ED.15 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m
 
09.ED.15 Parachrysotile? Mg3Si2O5(OH)4 Unk Ortho
 

Other Pecoraite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Pecoraite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Pecoraite Specimen Label here :

Pecoraite

Ni3Si2O5(OH)4
Dana No: 71.01.02d.04 Strunz No: 09.ED.15
Locality:

 

Notes:

 

 
   
 


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