Pumpellyite-(Mn++) Mineral Data

General Pumpellyite-(Mn++) Information

Chemical Formula:

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

Composition:

Molecular Weight = 504.86 gm

Calcium 15.88 % Ca 22.22 % CaO

Magnesium 1.20 % Mg 2.00 % MgO

Manganese 16.32 % Mn 10.54 % MnO / 11.73 % Mn₂O₃

Aluminum 5.34 % Al 10.10 % Al₂O₃

Iron 2.77 % Fe 3.95 % Fe₂O₃

Silicon 16.69 % Si 35.70 % SiO₂

Hydrogen 0.60 % H 5.35 % H₂O

Oxygen 41.20 % O

______ ______

100.00 % 101.58 % = TOTAL OXIDE

Empirical Formula:

Ca₂Mn²⁺_0.75Mg_0.25AlMn³⁺_0.75Fe³⁺_0.25(SiO₄)(Si₂O₇)(OH)ï¿½(H₂O)

Environment:

Metamorphosed Mn-oxides in pelitic and dolomitic rocks.

IMA Status:

Approved IMA 1981

Locality:

Ochiai mine, Barazawa, Kohsai-cho, Yamanashi Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

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

Name Pronunciation:

Pumpellyite-(Mn++) + Pronunciation

Pumpellyite-(Mn++) Image

Images:

Pumpellyite-(Mn++)

Comments: BSE image of pumpellyite-(Mn++) (P) intercleaved with phlogopite (black) between braunite (white) and calcite (C).
Location: Mn oxide ores from the Precambrian Sausar Group, India. (AmMin, v76:241). Scale: Scale Bar 0.01 cm.
© American Mineralogist

Pumpellyite-(Mn++) Crystallography

Axial Ratios:

a:b:c =1.4884:1:3.1953

Cell Dimensions:

a = 8.923, b = 5.995, c = 19.156, Z = 4; beta = 97.8° V = 1,015.24 Den(Calc)= 3.30

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): 2.93(1), 2.725(0.9), 4.75(0.65),2.65(0.55), 2.53(0.5), 2.2(0.45), 4.43(0.35),

Physical Properties of Pumpellyite-(Mn++)

Cleavage:

{001} Good, {100} Good

Color:

Blue green, Olive green, Brown.

Density:

3.2

Diaphaneity:

Transparent to 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-(Mn++)

Gladstone-Dale:

CI meas= -0.051 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2371,KPDmeas= 0.2445,KC= 0.2325
Ncalc = 1.74 - 1.77

Optical Data:

Biaxial (+), a=1.752, b=1.795, g=1.8, bire=0.0480, 2V(Calc)=36, 2V(Meas)=40-50.

Calculated Properties of Pumpellyite-(Mn++)

Electron Density:

Bulk Density (Electron Density)=3.26 gm/cc
note: Specific Gravity of Pumpellyite-(Mn++) =3.30 gm/cc.

Fermion Index:

Fermion Index = 0.0099967154
Boson Index = 0.9900032846

Photoelectric:

PE_{Pumpellyite-(Mn++)}= 7.71 barns/electron
U=PE_{Pumpellyite-(Mn++)} x rElectron Density= 25.11 barns/cc.

Radioactivity:

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

Pumpellyite-(Mn++) Classification

Dana Class:

58.02.02.08 (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-(Mn++) Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

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

Pumpellyite-(Mn++)

Ca2(Mn++,Mg)(Al,Mn+++,Fe)2(SiO4)(Si2O7(OH)2•(H2O)
Dana No: 58.02.02.08 Strunz No: 09.BG.20
Locality:

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