Pumpellyite-(Fe++) Mineral Data

Pumpellyite-(Fe++) Mineral Data +

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General Pumpellyite-(Fe++) Information

Chemical Formula:

Ca2Fe++(Al,Fe+++)2(SiO4)(Si2O7)(OH)2·(H2O)

Composition:

Molecular Weight = 485.24 gm

Calcium 16.52 % Ca 23.11 % CaO

Aluminum 11.12 % Al 21.01 % Al₂O₃

Iron 11.51 % Fe 14.81 % FeO

Silicon 17.36 % Si 37.15 % SiO₂

Hydrogen 0.62 % H 5.57 % H₂O

Oxygen 42.86 % O

______ ______

100.00 % 101.65 % = TOTAL OXIDE

Empirical Formula:

Ca₂Fe²⁺Al₂(SiO₄)(Si₂O₇)(OH)·(H₂O)

IMA Status:

Approved IMA 1971

Locality:

Langban, near Filipstad, Varmland, Sweden (actually TL of julgoldite). Link to MinDat.org Location Data.

Name Origin:

Named after the American geologist, R. Pumpelly (1837-1923).

Synonym:

Ferropumpellyite

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Pumpellyite-(Fe++) Crystallography

Axial Ratios:

a:b:c =1.4152:1:3.2338

Cell Dimensions:

a = 8.49, b = 5.999, c = 19.4, Z = 4; beta = 100.4° V = 971.84 Den(Calc)= 3.32

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/m

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

By Intensity(I/I_o): 2.91(1), 2.75(0.6), 3.79(0.6),2.22(0.4), 2.47(0.3), 2.66(0.3), 4.43(0.3), 4.76(0.3),

Physical Properties of Pumpellyite-(Fe++)

Cleavage:

[001] Good, [100] Good

Color:

Blue green, Olive green, Brown.

Density:

3.2

Diaphaniety:

Translucent

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Massive - Lamellar - Distinctly foliated fine-grained forms.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Pumpellyite-(Fe++)

Gladstone-Dale:

CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2069,KPDmeas= 0.2147,KC= 0.2161

Optical Data:

Biaxial (+), a=1.682, b=1.685, g=1.694, bire=0.0120

Calculated Properties of Pumpellyite-(Fe++)

Electron Density:

r_electron=3.18 gm/cc
note: r_{Pumpellyite-(Fe++)}=3.20 gm/cc.

Fermion Index

Fermion Index = 0.01097
Boson Index = 0.98903

Photoelectric:

PE_{Pumpellyite-(Fe++)}= 6.40 barns/electron
U=PE_{Pumpellyite-(Fe++)} x r_electron= 20.35 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pumpellyite-(Fe++) is Not Radioactive

Pumpellyite-(Fe++) Classification

Dana Class:

58.2.2.5 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

(58.2)with cations in [6] and higher coordination; single and double groups (n=1,2)

(58.2.2)Pumpellyite group

58.2.2.1 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2·(H2O) C 2/m 2/m

58.2.2.2 Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2·(H2O) A2/m 2/m

58.2.2.3 Okhotskite-(Mg)* Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2·(H2O) Mono

58.2.2.4 Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m

58.2.2.5 Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

58.2.2.6 Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2·(H2O) A2/m 2/m

58.2.2.7 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

58.2.2.8 Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2·(H2O) A2/m 2/m

58.2.2.9 Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

Strunz Class:

VIII/C.24-40 VIII - Silicates

VIII/C - Sorosilicates, mixed structure with [SiO4]2- "inseln" and [Si2O7]6- groups

VIII/C.24 - Pumpellyite group

VIII/C.24-10 Macfallite Ca2(Mn,Al)3(SiO4)(Si2O7)(OH)3 P 2₁/m 2/m

VIII/C.24-20 Sursassite Mn2Al3(SiO4)(Si2O7)(OH)3 P 2₁/m 2/m

VIII/C.24-30 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

VIII/C.24-40 Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

VIII/C.24-42 Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2·(H2O) A2/m 2/m

VIII/C.24-50 Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2·(H2O) A2/m 2/m

VIII/C.24-60 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2·(H2O) C 2/m 2/m

VIII/C.24-61 Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2·(H2O) A2/m 2/m

VIII/C.24-70 Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

VIII/C.24-80 Okhotskite-(Mg)* Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2·(H2O) Mono

VIII/C.24-80* Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m

VIII/C.24-90 Samfowlerite Ca14Mn3Zn2(Be,Zn)2Be6(SiO4)6(Si2O7)4(OH,F)6 P 2₁/c 2/m

Other Pumpellyite-(Fe++) Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Pumpellyite-(Fe++) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (MinSocAm) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Print or Cut-and-Paste your Pumpellyite-(Fe++) Specimen Label here :

Pumpellyite-(Fe++)

Ca2Fe++(Al,Fe+++)2(SiO4)(Si2O7)(OH)2·(H2O)
Dana No: 58.2.2.5 Strunz No: VIII/C.24-40
Locality:

Notes: