Pimelite Mineral Data

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.

IMA Status:

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

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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:

HexagonalSpace 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

Diaphaniety:

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

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:

r_electron=2.61 gm/cc
note: r_Pimelite=2.60 gm/cc.

Fermion Index

Fermion Index = 0.01327
Boson Index = 0.98673

Photoelectric:

PE_Pimelite= 13.12 barns/electron
U=PE_Pimelite x r_electron= 34.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pimelite is Not Radioactive

Pimelite Classification

Dana Class:

71.3.1b.5 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.3)with 2:1 clays

(71.3.1b)Smectite group (Trioctahedral Smectites)

71.3.1b.1 Sobotkite? (K,Ca0.5)0.33(Mg,Al)3(Si3Al)O10(OH)2·1-5(H2O) Unk. Mono

71.3.1b.2 Saponite (Ca/2,Na)0,3(Mg,Fe)3(Si,Al)4O10(OH)2·4(H2O) C 2/m 2/m

71.3.1b.2a Ferrosaponite! Ca0.3(Fe,Mg,Fe)3(Si,Al)4O10(OH)2·4(H2O) C? Mono

71.3.1b.3 Sauconite Na0,3Zn3(Si,Al)4O10(OH)2·4(H2O) C 2/m 2/m

71.3.1b.4 Hectorite Na0,3(Mg,Li)3Si4O10(OH)2 C 2/m 2/m

71.3.1b.5 Pimelite Ni3Si4O10(OH)2·4(H2O) Unk. Hex

71.3.1b.6 Stevensite (Ca0.5,Na)0.33(Mg,Fe)3Si4O10(OH)2·n(H2O) Unk (ORTH ?) Mono

71.3.1b.7 Yakhontovite (Ca,K)0.5(Cu,Fe,Mg)2Si4O10(OH)2·3(H2O) C 2/m 2/m

71.3.1b.8 Zincsilite Zn3Si4O10(OH)2·4(H2O)(?) C 2/m ? 2/m

Strunz Class:

VIII/H.09-65 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups

VIII/H.09 - Talc series

VIII/H.09-10 Pyrophyllite Al2Si4O10(OH)2 P1 1

VIII/H.09-20 Ferripyrophyllite Fe2Si4O10(OH)2 C 2/m 2/m

VIII/H.09-30 Macaulayite (Fe,Al)24Si4O43(OH)2 C? Mono

VIII/H.09-40 Talc Mg3Si4O10(OH)2 C 2/c 2/m

VIII/H.09-50 Minnesotaite (Fe,Mg)3Si4O10(OH)2 C1 1

VIII/H.09-60 Willemseite (Ni,Mg)3Si4O10(OH)2 C 2/c 2/m

VIII/H.09-65 Pimelite Ni3Si4O10(OH)2·4(H2O) Unk. Hex

VIII/H.09-70 Kegelite Pb8Al4Si8O20(SO4)2(CO3)4(OH)8 A2/m,A2,Am Mono

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 - Franklin Minerals(Dunn) 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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Pimelite

Ni3Si4O10(OH)2·4(H2O)
Dana No: 71.3.1b.5 Strunz No: VIII/H.09-65
Locality:

Notes: