Poppiite Mineral Data

General Poppiite Information

Chemical Formula:

Ca2(V+++,Fe+++,Mg)(V+++,Al)2(Si,Al)3(O,OH)14

Composition:

Molecular Weight = 2,128.85 gm

Potassium 0.06 % K 0.07 % K₂O

Rubidium 0.08 % Rb 0.09 % Rb₂O

Sodium 0.29 % Na 0.39 % Na₂O

Calcium 14.46 % Ca 20.23 % CaO

Magnesium 0.89 % Mg 1.48 % MgO

Titanium 0.09 % Ti 0.15 % TiO₂

Manganese 1.52 % Mn 1.97 % MnO

Aluminum 2.14 % Al 4.05 % Al₂O₃

Vanadium 19.50 % V 28.69 % V₂O₃

Iron 2.68 % Fe 3.83 % Fe₂O₃

Copper 0.12 % Cu 0.15 % CuO

Silicon 15.42 % Si 32.99 % SiO₂

Hydrogen 0.66 % H 5.92 % H₂O

Oxygen 42.09 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca_7.68Na_0.27K_0.03Rb_0.02V³⁺_1.26Fe³⁺_1.02Mg_0.78Mn²⁺_0.59Al_0.31Cu_0.04V³⁺_6.89Al_1.07 Ti_0.04Si_11.69Al_0.31O₄₂(OH)₁₄

Environment:

Massive braunite + quartz + hematite aggregates under prehnite-pumpellyite metamorphic facies conditions. Associated with roscoeite. Pumpellyite group.

IMA Status:

Approved IMA 2005 (Dana # Added)

Locality:

Gambatesa Manganese mine, Val Graveglia, Genova, Italy Link to MinDat.org Location Data.

Name Origin:

Named in memory of Luciano Poppi, Professor of Mineralogy at Modena and Reggio Emilia University, Italy.

Synonym:

IMA2005-018

Poppiite Image

Images:

Poppiite

Comments: SEM micrograph of a poppiite crystal fragment (AmMin v91. p585).
Location: Gambatesa mine, near the village of Reppia (Val Graveglia, Northern Apennines, Italy). Scale: See Image.
© American Mineralogist

Poppiite Crystallography

Axial Ratios:

a:b:c =3.1912:1:1.4688

Cell Dimensions:

a = 19.2889, b = 6.0444, c = 8.8783, Z = 1; V = 1,035.12 Den(Calc)= 3.41

Crystal System:

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

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

By Intensity(I/I_o): 2.93(1)(511 ), 3.817(0.7)(202 ), 2.548(0.65)(3?13 ),1.612(0.57)(420 ), 2.367(0.51)(731,424), 2.756(0.34)(222,403 ), 4.739(0.34),

Crystal Structure:

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Brigatti M F , Caprilli E , Marchesini M , American Mineralogist , 91 (2006) p.584-588, Poppiite, the V3+ end-member of the pumpellyite group: Description and crystal structure, Locality: Gambatesa mine, val Graveglia, Genova, Northern Italy

Physical Properties of Poppiite

Cleavage:

{100} Good, {001} Good

Color:

Brown, Greenish brown.

Density:

3.36

Diaphaneity:

Transparent

Fracture:

Brittle - Subconchoidal - Brittle frature with subconchoidal fragments

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Luster:

Vitreous (Glassy)

Streak:

greenish white

Optical Properties of Poppiite

Gladstone-Dale:

CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2328,KPDmeas= 0.2363,KC= 0.2404
Ncalc = 1.81 - 1.82

Optical Data:

Biaxial (-), a=1.768, b=1.804, g=1.81, bire=0.0420

Calculated Properties of Poppiite

Electron Density:

Bulk Density (Electron Density)=3.30 gm/cc
note: Specific Gravity of Poppiite =3.36 gm/cc.

Fermion Index:

Fermion Index = 0.0096621953
Boson Index = 0.9903378047

Photoelectric:

PE_Poppiite= 7.46 barns/electron
U=PE_Poppiite x r_electron= 24.61 barns/cc.

Radioactivity:

GRapi = 34.24 (Gamma Ray American Petroleum Institute Units)
Concentration of Poppiite per GRapi unit = 2.92 (%)

Estimated Radioactivity from Poppiite - barely detectable

Poppiite Classification

Dana Class:

58.02.02.10 (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 Poppiite Information

References:

NAME( AmMin, v91, 584) PHYS. PROP.(AmMin, v91, 584) OPTIC PROP.(AmMin, v91, 584)

See Also:

Links to other databases for Poppiite :
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 Poppiite Specimen Label here :

Poppiite

Ca2(V+++,Fe+++,Mg)(V+++,Al)2(Si,Al)3(O,OH)14
Dana No: 58.02.02.10 Strunz No: 09.BG.20
Locality:

Notes: