Pumpellyite-(Al) Mineral Data

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General Pumpellyite-(Al) Information

Chemical Formula:

Ca2(Al,Fe++,Mg)Al2(SiO4)(Si2O7)(OH,O)2•H2O

Composition:

Molecular Weight = 481.95 gm

Sodium 0.05 % Na 0.06 % Na₂O

Calcium 16.55 % Ca 23.15 % CaO

Magnesium 1.21 % Mg 2.01 % MgO

Manganese 0.11 % Mn 0.15 % MnO

Aluminum 13.55 % Al 25.60 % Al₂O₃

Iron 3.82 % Fe 4.92 % FeO

Silicon 17.48 % Si 37.40 % SiO₂

Hydrogen 0.75 % H 6.69 % H₂O

Oxygen 46.48 % O

______ ______

100.00 % 99.98 % = TOTAL OXIDE

Empirical Formula:

Ca_1.99Na_0.01Al_0.42Fe²⁺_0.33Mg_0.24Mn²⁺_0.01Al₂(SiO₄)(Si₂O₇)(OH)_2.42·0.58(H₂O)

Environment:

Found in late-formed veins associated with calcite, K-feldspar, and chlorite in aggregates. Pumpellyite group.

IMA Status:

Approved IMA 2005 - (Dana # Added)

Locality:

Carrière de la Flèche quarry, near Bertrix, Ardennes, Belgium. Link to MinDat.org Location Data.

Name Origin:

Named as the Al analog of pumpellyite.

Name Pronunciation:

Pumpellyite-(Al) + Pronunciation

Synonym:

IMA2005-016

Pumpellyite-(Al) Image

Images:

Pumpellyite-(Al)

Comments: Pale green radiating fibrous to bladed pumpellyite-(Al) crystals on matrix.
Location: La Fleche Quarry, Bertrix, Luxembourg Province, Belgium. Scale: See Image.
© Rruff Database

Pumpellyite-(Al) Crystallography

Axial Ratios:

a:b:c =1.495:1:3.2427

Cell Dimensions:

a = 8.818, b = 5.898, c = 19.126, Z = 4; beta = 97.26° V = 986.74 Den(Calc)= 3.24

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): 2.895(1), 2.912(0.95), 3.787(0.8),3.04(0.7), 4.371(0.65), 2.191(0.45), 2.731(0.4), 8.735(0.35),

Crystal Structure:

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Yoshiasa A , Matsumoto T , American Mineralogist , 70 (1985) p.1011-1019, Crystal structure refinement and crystal chemistry of pumpellyite

Physical Properties of Pumpellyite-(Al)

Cleavage:

{001} Good, {100} Good

Color:

White.

Diaphaneity:

Transparent to translucent

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Pumpellyite-(Al)

Gladstone-Dale:

CI calc= 0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2108,KC= 0.2158
Ncalc = 1.7

Optical Data:

Biaxial (+), a=1.678, b=1.68, g=1.691, bire=0.0130

Calculated Properties of Pumpellyite-(Al)

Electron Density:

Bulk Density (Electron Density)=3.24 gm/cc
note: Specific Gravity of Pumpellyite-(Al) =3.24 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Pumpellyite-(Al)}= 4.28 barns/electron
U=PE_{Pumpellyite-(Al)} x rElectron Density= 13.85 barns/cc.

Radioactivity:

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

Pumpellyite-(Al) Classification

Dana Class:

58.02.02.11 (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-(Al) Information

References:

NAME( AmMin, v73:253) PHYS. PROP.(AmMin, v73:253) OPTIC PROP.(AmMin, v73:253)

See Also:

Links to other databases for Pumpellyite-(Al) :
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-(Al) Specimen Label here :

Pumpellyite-(Al)

Ca2(Al,Fe++,Mg)Al2(SiO4)(Si2O7)(OH,O)2•H2O
Dana No: 58.02.02.11 Strunz No: 09.BG.20
Locality:

Notes: