Penikisite Mineral Data

General Penikisite Information

Chemical Formula:

BaMg2Al2(PO4)3(OH)3

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

Empirical Formula:

BaMg_1.75Fe²⁺_0.25Al₂(PO₄)₃(OH)₃

Environment:

Forms a series with kulanite (Fe-end member).

IMA Status:

Approved IMA 1977

Locality:

Rapid Creek (Cross Cut Creek), Big fish River, Yukon Territory, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for Gunar Penikis (1936-1979), who discovered the locality.

Name Pronunciation:

Penikisite + Pronunciation

Synonym:

IMA1976-023

Penikisite Image

Images:

Penikisite Jagowerite

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

Axial Ratios:

a:b:c =0.7456:1:0.4077

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

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.094(1), 2.915(0.8), 2.649(0.7),

Physical Properties of Penikisite

Cleavage:

{010} Good, {110} Good

Color:

Blue, Green.

Density:

3.79

Diaphaneity:

Transparent to Translucent

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Hardness:

4 - Fluorite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Penikisite

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

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.

Pleochroism (x):

grass green.

Pleochroism (y):

blue green.

Pleochroism (z):

pale pink.

Calculated Properties of Penikisite

Electron Density:

Bulk Density (Electron Density)=3.60 gm/cc
note: Specific Gravity of Penikisite =3.79 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Penikisite= 101.16 barns/electron
U=PE_Penikisite x rElectron Density= 364.53 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Penikisite is Not Radioactive

Penikisite Classification

Dana Class:

41.09.01.02 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.09)where (A B)5 (XO4)3 Zq

(41.09.01)Kulanite Group

41.09.01.01 Kulanite Ba(Fe,Mn,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

41.09.01.02 Penikisite BaMg2Al2(PO4)3(OH)3 P1 1

41.09.01.03 Bjarebyite (Ba,Sr)(Mn,Fe,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

41.09.01.04 Perloffite Ba(Mn,Fe)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

41.09.01.05 Johntomaite! Ba(Fe,Ca,Mn)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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

Search for Penikisite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Penikisite :

A Bijoux Google Search for Penikisite
Adam's Minerals Google Search for Penikisite
Cape Minerals Google Search for Penikisite
Dakota Matrix Minerals Google Search for Penikisite
Excalibur Mineral Corp. Google Search for Penikisite
Exceptional Minerals Google Search for Penikisite
John Betts Fine Minerals Search for Penikisite
McDougall Minerals Google Search for Penikisite
Mineral News Website Link
Rock and Mineral Shows Google Search for Penikisite
Weinrich Minerals, Inc. Google Search for Penikisite

Ask about Penikisite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Penikisite Specimen Label here :

Penikisite

BaMg2Al2(PO4)3(OH)3
Dana No: 41.09.01.02 Strunz No: 08.BH.20
Locality:

Notes: