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Poppiite Mineral Data

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General Poppiite Information

Help on Chemical  Formula: Chemical Formula: Ca2(V+++,Fe+++,Mg)(V+++,Al)2(Si,Al)3(O,OH)14
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca7.68Na0.27K0.03Rb0.02V3+1.26Fe3+1.02Mg0.78Mn2+0.59Al0.31Cu0.04V3+6.89Al1.07 Ti0.04Si11.69Al0.31O42(OH)14
Help on Environment: Environment: Massive braunite + quartz + hematite aggregates under prehnite-pumpellyite metamorphic facies conditions. Associated with roscoeite. Pumpellyite group.
Help on IMA Status: IMA Status: Approved IMA 2005 (Dana # Added)
Help on Locality: Locality: Gambatesa Manganese mine, Val Graveglia, Genova, Italy Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in memory of Luciano Poppi, Professor of Mineralogy at Modena and Reggio Emilia University, Italy.
Help on Synonym: Synonym: IMA2005-018

Poppiite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


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

Help on Axial Ratios: Axial Ratios: a:b:c =3.1912:1:1.4688
Help on Cell Dimensions: Cell Dimensions: a = 19.2889, b = 6.0444, c = 8.8783, Z = 1; V = 1,035.12 Den(Calc)= 3.41
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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),

Physical Properties of Poppiite

Help on Cleavage: Cleavage: {100} Good, {001} Good
Help on Color: Color: Brown, Greenish brown.
Help on Density: Density: 3.36
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Subconchoidal - Brittle frature with subconchoidal fragments
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: greenish white

Optical Properties of Poppiite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (-), a=1.768, b=1.804, g=1.81, bire=0.0420

Calculated Properties of Poppiite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.30 gm/cc
note: Specific Gravity of Poppiite =3.36 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0096621953
Boson Index = 0.9903378047
Help on Photoelectric: Photoelectric: PEPoppiite = 7.46 barns/electron
U=PEPoppiite x relectron= 24.61 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: Dana Class: (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 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2•(H2O) C 2/m 2/m Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2•(H2O) A2/m 2/m Okhotskite-(Mg)* Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2•(H2O) Mono Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2•(H2O) A2/m 2/m Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2•(H2O) A2/m 2/m Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m Poppiite! Ca2(V,Fe,Mg)(V,Al)2(Si,Al)3(O,OH)14 C 2/m 2/m Pumpellyite-(Al)! Ca2(Al,Fe,Mg)Al2(SiO4)(Si2O7)(OH,O)2•H2O A2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AmMin, v91, 584) PHYS. PROP.(AmMin, v91, 584) OPTIC PROP.(AmMin, v91, 584)
Help on See Also: 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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Dana No: Strunz No: 09.BG.20





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