Pimelite Mineral Data

General Pimelite Information

Chemical Formula:

Ni3Si4O10(OH)2•4(H2O)

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

Empirical Formula:

Ni₃Si₄O₁₀(OH)₂•4(H₂O)

Environment:

Found in lateritic profiles above serpentinites or dunites. Pimelite (1800) = probably willemseite or kerolite

IMA Status:

Discredited IMA 2006 - Valid Species (Pre-IMA) 1800

Locality:

Kosemutz, near Frankenstein, Upper Silseia, Poland. Link to MinDat.org Location Data.

Name Origin:

Named for the Greek word for "fat", in allusion to the mineral's appearance.

Synonym:

Desaulsite

Kerolite(Ni)

Revdanskite

Rottisite

Pimelite Crystallography

Axial Ratios:

a:c = 1:2.82001

Cell Dimensions:

a = 5.256, c = 14.822, Z = 1; V = 354.61 Den(Calc)= 2.60

Crystal System:

Hexagonal Space Group: Unk.

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Cleavage:

None

Color:

Bright green, Apple green, Yellowish green, Emerald green, Greenish white.

Density:

2.5

Diaphaneity:

Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Hardness:

2.5 - Finger Nail

Luster:

Waxy

Streak:

white

Optical Properties of Pimelite

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

Optical Data:

Biaxial (-), a=1.592, g=1.615, bire=0.0230, 2V(Meas)=30-80.

Pleochroism (x):

colorless or pale green.

Pleochroism (y):

light yellowish green or light yellowish green.

Pleochroism (z):

light yellowish green or light yellowish green.

Calculated Properties of Pimelite

Electron Density:

Bulk Density (Electron Density)=2.61 gm/cc
note: Specific Gravity of Pimelite =2.60 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Pimelite= 13.12 barns/electron
U=PE_Pimelite x rElectron Density= 34.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pimelite is Not Radioactive

Pimelite Classification

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

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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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

Pimelite

Ni3Si4O10(OH)2•4(H2O)
Dana No: 71.03.01b.05 Strunz No: 09.BX.00
Locality:

Notes:

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