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Penikisite Mineral Data

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General Penikisite Information

Help on Chemical  Formula: Chemical Formula: BaMg2Al2(PO4)3(OH)3
Help on Composition: Composition: Molecular Weight = 583.72 gm
   Barium      23.53 %  Ba   26.27 % BaO
   Magnesium    7.29 %  Mg   12.08 % MgO
   Aluminum     9.24 %  Al   17.47 % Al2O3
   Iron         2.39 %  Fe    3.08 % FeO
   Phosphorus  15.92 %  P    36.48 % P2O5
   Hydrogen     0.52 %  H     4.63 % H2O
   Oxygen      41.11 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: BaMg1.75Fe2+0.25Al2(PO4)3(OH)3
Help on Environment: Environment: Forms a series with kulanite (Fe-end member).
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Rapid Creek (Cross Cut Creek), Big fish River, Yukon Territory, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Gunar Penikis (1936-1979), who discovered the locality.
Help on Name Pronunciation: Name Pronunciation: Penikisite + Pronunciation Say PENIKISITE
Help on Synonym: Synonym: IMA1976-023

Penikisite Image

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  Jagowerite   Penikisite

Comments: Light green crystal of jagowerite intergrown with darker green penikisite in a tetrahedrite (black) and white quartz matrix.
Location: From quartz veins cutting clays 26 km N of Hess River, Yukon Territory, Canada. Scale: Sample size 2x1 cm.
© Dave Barthelmy

Penikisite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7456:1:0.4077
Help on Cell Dimensions: Cell Dimensions: a = 8.999, b = 12.069, c = 4.921, Z = 2; alpha = 90°, beta = 100.517°, gamma = 90° V = 525.49 Den(Calc)= 3.69
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.094(1), 2.915(0.8), 2.649(0.7),

Physical Properties of Penikisite

Help on Cleavage: Cleavage: {010} Good, {110} Good
Help on Color: Color: Blue, Green.
Help on Density: Density: 3.79
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Penikisite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1876,KPDmeas= 0.1827,KC= 0.1822
Ncalc = 1.67 - 1.69
Help on Optical Data: Optical Data: Biaxial (+), a=1.684, b=1.688, g=1.705, bire=0.0210, 2V(Calc)=54, 2V(Meas)=52-56. Dispersion r > v.
Help on Pleochroism (x): Pleochroism (x): grass green.
Help on Pleochroism (y): Pleochroism (y): blue green.
Help on Pleochroism (z): Pleochroism (z): pale pink.

Calculated Properties of Penikisite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.60 gm/cc
note: Specific Gravity of Penikisite =3.79 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEPenikisite = 101.16 barns/electron
U=PEPenikisite x rElectron Density= 364.53 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Penikisite is Not Radioactive

Penikisite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.09)where (A B)5 (XO4)3 Zq
  (41.09.01)Kulanite Group Kulanite Ba(Fe,Mn,Mg)2Al2(PO4)3(OH)3 P 21/m 2/m Penikisite BaMg2Al2(PO4)3(OH)3 P1 1 Bjarebyite (Ba,Sr)(Mn,Fe,Mg)2Al2(PO4)3(OH)3 P 21/m 2/m Perloffite Ba(Mn,Fe)2Fe2(PO4)3(OH)3 P 21/m 2/m Johntomaite! Ba(Fe,Ca,Mn)2Fe2(PO4)3(OH)3 P 21/m 2/m
Help on  Strunz Class: Strunz Class: 08.BH.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1
08.BH.20 Bjarebyite (Ba,Sr)(Mn,Fe,Mg)2Al2(PO4)3(OH)3 P 21/m 2/m
08.BH.20 Kulanite Ba(Fe,Mn,Mg)2Al2(PO4)3(OH)3 P 21/m 2/m
08.BH.20 Penikisite BaMg2Al2(PO4)3(OH)3 P1 1
08.BH.20 Perloffite Ba(Mn,Fe)2Fe2(PO4)3(OH)3 P 21/m 2/m
08.BH.20 Johntomaite! Ba(Fe,Ca,Mn)2Fe2(PO4)3(OH)3 P 21/m 2/m

Other Penikisite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Penikisite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.BH.20





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