General Pecoraite Information
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Chemical Formula: |
Ni3Si2O5(OH)4 |
Composition: |
Molecular Weight = 380.27 gm |
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Silicon 14.77 % Si 31.60 % SiO2 |
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Nickel 46.30 % Ni 58.92 % NiO |
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Hydrogen 1.06 % H 9.48 % H2O |
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Oxygen 37.87 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Ni3SI2O5(OH)4 |
IMA Status: |
Approved IMA 1969 |
Locality: |
Link to MinDat.org Location Data. |
Synonym: |
Chrysotile(Ni) |
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Images:
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Pecoraite Crystallography
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Axial Ratios: |
a:b:c =0.5742:1:1.6048 |
Cell Dimensions: |
a = 5.26, b = 9.16, c = 14.7, Z = 4; beta = 92° V = 707.84 Den(Calc)= 3.57 |
Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m |
X Ray Diffraction: |
By Intensity(I/Io): 7.43(1), 1.529(0.8), 3.66(0.8), |
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Physical Properties of Pecoraite
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Color: |
Dark green. |
Density: |
3.84 - 3.084, Average = 3.46 |
Diaphaniety: |
Translucent |
Hardness: |
2.5 - Finger Nail |
Streak: |
light green |
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Optical Properties of Pecoraite
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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 |
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. |
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Calculated Properties of Pecoraite
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Electron Density: |
relectron=3.42 gm/cc note: rPecoraite =3.46 gm/cc. |
Fermion Index |
Fermion Index = 0.01231 Boson Index = 0.98769 |
Photoelectric: |
PEPecoraite = 18.77 barns/electron U=PEPecoraite x relectron= 64.27 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Pecoraite is Not Radioactive |
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Pecoraite Classification
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Dana Class: |
71.1.2d.4 (71)Phyllosilicate Sheets of Six-Membered Rings |
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(71.1)with 1:1 layers |
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(71.1.2d)Serpentine group (Chrysotile subgroup) |
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71.1.2d.0 Chrysotile! Mg3Si2O5(OH)4 A2/m 2/m |
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71.1.2d.1 Clinochrysotile Mg3Si2O5(OH)4 Cc, C 2/m Mono |
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71.1.2d.2 Orthochrysotile Mg3Si2O5(OH)4 Unk Ortho |
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71.1.2d.3 Parachrysotile Mg3Si2O5(OH)4 Unk Ortho |
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71.1.2d.4 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m |
Strunz Class: |
VIII/H.27-160 VIII - Silicates |
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VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups |
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VIII/H.27 - Serpentine group |
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VIII/H.27-10 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m |
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VIII/H.27-20 Lizardite Mg3Si2O5(OH)4 P1 1 |
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VIII/H.27-30 Clinochrysotile Mg3Si2O5(OH)4 Cc, C 2/m Mono |
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VIII/H.27-40 Orthochrysotile Mg3Si2O5(OH)4 Unk Ortho |
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VIII/H.27-50 Parachrysotile Mg3Si2O5(OH)4 Unk Ortho |
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VIII/H.27-55 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono |
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VIII/H.27-60 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono |
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VIII/H.27-70 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m |
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VIII/H.27-80 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m |
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VIII/H.27-90 Zinalsite Zn2AlSi2O5(OH)4·2(H2O)(?) Mono |
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VIII/H.27-95 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m |
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VIII/H.27-100 Amesite Mg2Al(SiAl)O5(OH)4 C1 1 |
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VIII/H.27-110 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 63 6 |
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VIII/H.27-120 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 31m 3m |
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VIII/H.27-140 Karpinskite (Mg,Ni)2Si2O5(OH)2(?) Unk Mono |
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VIII/H.27-150 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2 |
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VIII/H.27-160 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m |
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VIII/H.27-170 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2 |
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VIII/H.27-180 Maufite (Mg,Ni)Al4Si3O13·4(H2O)(?) Mono ? Mono |
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VIII/H.27-190 Carlosturanite (Mg,Fe,Ti,Mn)21(Si,Al)12O28(OH)34 Cm m |
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Other Pecoraite Information
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References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Pecoraite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - Crocoite.com Mineral Locations
4 - EUROmin Project
5 -Google Images
6 -Google Scholar
7 -Handbook of Mineralogy (MinSocAm)
8 -Handbook of Mineralogy (UofA)
9 -MinDAT
10 -MinMax(Deutsch)
11 -MinMax(English)
12 -Mineralienatlas (Deutsch)
13 -QUT Mineral Atlas
14 -École des Mines de Paris
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Print or Cut-and-Paste your Pecoraite Specimen Label here :
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Pecoraite
Ni3Si2O5(OH)4
Dana No: 71.1.2d.4 Strunz No: VIII/H.27-160
Locality:
Notes:
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