Pumpellyite-(Fe++) Mineral Data

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).

Name Pronunciation:

Pumpellyite-(Fe++) + Pronunciation

Synonym:

Ferropumpellyite

Pumpellyite-(Fe++) Image

Images:

Pumpellyite-(Fe++)

Comments: Gas cavities in basalt matrix lined with sprays of 1 mm green pumpellyite-(Fe) crystals.
Location: Braen's Quarry, Haledon, Passaic Co., New Jersey, USA. Scale: 25x15x15 mm.
© John Betts - Fine Minerals

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 - Prismatic H-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

Diaphaneity:

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
Ncalc = 1.69 - 1.72

Optical Data:

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

Calculated Properties of Pumpellyite-(Fe++)

Electron Density:

Bulk Density (Electron Density)=3.18 gm/cc
note: Specific Gravity of Pumpellyite-(Fe++) =3.20 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pumpellyite-(Fe++) is Not Radioactive

Pumpellyite-(Fe++) Classification

Dana Class:

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

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

(58.02.02)Pumpellyite group

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

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

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

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

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

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

58.02.02.07 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m

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

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

58.02.02.10 Poppiite! Ca2(V,Fe,Mg)(V,Al)2(Si,Al)3(O,OH)14 C 2/m 2/m

58.02.02.11 Pumpellyite-(Al)! Ca2(Al,Fe,Mg)Al2(SiO4)(Si2O7)(OH,O)2•H2O A2/m 2/m

Strunz Class:

09.BG.20 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;

09.BG.20 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2•(H2O) C 2/m 2/m

09.BG.20 Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2•(H2O) A2/m 2/m

09.BG.20 Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m

09.BG.20 Okhotskite-(Mg)* Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2•(H2O) Mono

09.BG.20 Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m

09.BG.20 Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2•(H2O) A2/m 2/m

09.BG.20 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m

09.BG.20 Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2•(H2O) A2/m 2/m

09.BG.20 Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m

09.BG.20 Pumpellyite-(Al)! Ca2(Al,Fe,Mg)Al2(SiO4)(Si2O7)(OH,O)2•H2O A2/m 2/m

09.BG.20 Poppiite! Ca2(V,Fe,Mg)(V,Al)2(Si,Al)3(O,OH)14 C 2/m 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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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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: 58.02.02.05 Strunz No: 09.BG.20
Locality:

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