Mineralogy Database

Pimelite Mineral Data

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General Pimelite Information

Help on Chemical  Formula: Chemical Formula: Ni3Si4O10(OH)2•4(H2O)
Help on Composition: Composition: Molecular Weight = 554.48 gm
   Silicon   20.26 %  Si   43.34 % SiO2
   Nickel    31.75 %  Ni   40.41 % NiO
   Hydrogen   1.82 %  H    16.25 % H2O
   Oxygen    46.17 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ni3Si4O10(OH)2•4(H2O)
Help on Environment: Environment: Found in lateritic profiles above serpentinites or dunites. Pimelite (1800) = probably willemseite or kerolite
Help on IMA Status: IMA Status: Discredited IMA 2006 - Valid Species (Pre-IMA) 1800
Help on Locality: Locality: Kosemutz, near Frankenstein, Upper Silseia, Poland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the Greek word for "fat", in allusion to the mineral's appearance.
Help on Synonym: Synonym: Desaulsite

Pimelite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.82001
Help on Cell Dimensions: Cell Dimensions: a = 5.256, c = 14.822, Z = 1; V = 354.61 Den(Calc)= 2.60
Help on Crystal System: Crystal System: Hexagonal Space Group: Unk.
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 15.1(1), 1.52(0.8), 2.66(0.4),4.56(0.4), 2.27(0.2), 3.34(0.2), 1.72(0.1),

Physical Properties of Pimelite

Help on Cleavage: Cleavage: None
Help on Color: Color: Bright green, Apple green, Yellowish green, Emerald green, Greenish white.
Help on Density: Density: 2.5
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Waxy
Help on Streak: Streak: white

Optical Properties of Pimelite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.115 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.072 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2321,KPDmeas= 0.2414,KC= 0.2165
Ncalc = 1.54 - 1.56
Help on Optical Data: Optical Data: Biaxial (-), a=1.592, g=1.615, bire=0.0230, 2V(Meas)=30-80.
Help on Pleochroism (x): Pleochroism (x): colorless or pale green.
Help on Pleochroism (y): Pleochroism (y): light yellowish green or light yellowish green.
Help on Pleochroism (z): Pleochroism (z): light yellowish green or light yellowish green.

Calculated Properties of Pimelite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.61 gm/cc
note: Specific Gravity of Pimelite =2.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEPimelite = 13.12 barns/electron
U=PEPimelite x rElectron Density= 34.21 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pimelite is Not Radioactive

Pimelite Classification

Help on  Dana Class: Dana Class: 71.03.01b.05 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.03)with 2:1 clays
  (71.03.01b)Smectite group (Trioctahedral Smectites)
71.03.01b.01 Sobotkite? (K,Ca0.5)0.33(Mg,Al)3(Si3Al)O10(OH)2•1-5(H2O) Unk. Mono
71.03.01b.02 Saponite (Ca/2,Na)0,3(Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
71.03.01b.02a Ferrosaponite! Ca0.3(Fe,Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C? Mono
71.03.01b.03 Sauconite Na0,3Zn3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
71.03.01b.04 Hectorite Na0,3(Mg,Li)3Si4O10(OH)2 C 2/m 2/m
71.03.01b.05 Pimelite? Ni3Si4O10(OH)2•4(H2O) Unk. Hex
71.03.01b.06 Stevensite (Ca0.5,Na)0.33(Mg,Fe)3Si4O10(OH)2•n(H2O) Unk (ORTH ?) Mono
71.03.01b.07 Yakhontovite (Ca,K)0.5(Cu,Fe,Mg)2Si4O10(OH)2•3(H2O) C 2/m 2/m
71.03.01b.08 Zincsilite Zn3Si4O10(OH)2•4(H2O)(?) C 2/m ? 2/m
Help on  Strunz Class: Strunz Class: 09.BX.00 09 - SILICATES (Germanates)
  09.B - Unclassified Strunz Phyllosilicates
  09.BX -Smectite Group
09.BX.00 Spodiophyllite? (Na,K)4(Mg,Fe)3(Fe,Al)2(Si8O24) Mono
09.BX.00 Pimelite? Ni3Si4O10(OH)2•4(H2O) Unk. Hex
09.BX.00 Zinalsite Zn2AlSi2O5(OH)4•2(H2O)(?) Mono
09.BX.00 Voloshinite Rb(LiAl1.5[]0.5)(Al0.5Si3.5)O10F2 C 2/c 2/m
09.BX.00 Shlykovite KCa[Si4O9(OH)]•3H2O P 21/c 2/m
09.BX.00 Orlovite KLi2TiSi4O11F C 2 2
09.BX.00 IMA2009-011 Ba3Na(Fe,Mn)8Ti4(Si2O7)4O4(OH,F)7 C1 1

Other Pimelite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Pimelite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Ecole des Mines de Paris
4 - Franklin Minerals(Dunn)
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: 71.03.01b.05 Strunz No: 09.BX.00





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