Penikisite Mineral Data

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.

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

Diaphaniety:

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

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:

r_electron=3.60 gm/cc
note: r_Penikisite=3.79 gm/cc.

Fermion Index

Fermion Index = 0.04992
Boson Index = 0.95008

Photoelectric:

PE_Penikisite= 101.16 barns/electron
U=PE_Penikisite x r_electron= 364.53 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Penikisite is Not Radioactive

Penikisite Classification

Dana Class:

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

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

(41.9.1)Dana Group

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

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

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

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

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

Strunz Class:

VII/B.29-10 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.29 - Bjarebyite group

VII/B.29-10 Penikisite BaMg2Al2(PO4)3(OH)3 P1 1

VII/B.29-20 Kulanite Ba(Fe,Mn,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

VII/B.29-30 Bjarebyite (Ba,Sr)(Mn,Fe,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

VII/B.29-35 Johntomaite! Ba(Fe,Ca,Mn)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

VII/B.29-40 Perloffite Ba(Mn,Fe)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

VII/B.29-50 Jagowerite BaAl2(PO4)2(OH)2 P1 1

VII/B.29-60 Vesignieite Cu3Ba(VO4)2(OH)2 C 2/m 2/m

VII/B.29-70 Drugmanite Pb2(Fe,Al)H(PO4)2(OH)2 P 2₁/a 2/m

VII/B.29-80 Mounanaite PbFe2(VO4)2(OH)2 P1 1

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Penikisite

BaMg2Al2(PO4)3(OH)3
Dana No: 41.9.1.2 Strunz No: VII/B.29-10
Locality:

Notes: