Priderite Mineral Data

Priderite Mineral Data +

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General Priderite Information

Chemical Formula:

(K,Ba)(Ti,Fe+++)8O16

Composition:

Molecular Weight = 715.42 gm

Potassium 4.92 % K 5.92 % K₂O

Barium 5.76 % Ba 6.43 % BaO

Sodium 0.32 % Na 0.43 % Na₂O

Titanium 43.50 % Ti 72.57 % TiO₂

Aluminum 1.13 % Al 2.14 % Al₂O₃

Iron 8.59 % Fe 12.28 % Fe₂O₃

Oxygen 35.78 % O

______ ______

100.00 % 99.78 % = TOTAL OXIDE

Empirical Formula:

K_0.9Ba_0.3Na_0.1Ti_6.5Fe³⁺_1.1Al_0.3O₁₆

Environment:

In some ultrapotassic lamproites, ultramafics and carbonatites.

IMA Status:

Valid Species (Pre-IMA) 1951

Locality:

Wolgidee Hills and the Argyle diamond mine, Kimberley District, Western Australia. Link to MinDat.org Location Data.

Name Origin:

Named for Rex Tregilgas Prider (1910-), Professor of Geology, University of Western Australia.

Synonym:

ICSD 50764

PDF 6-296

Priderite Image

Images:

Priderite

Comments: Clusters of sub-mm black, opaque crystals of priderite.
Location: Eveslogchorr Mt., Khibiny, Kola, Russia. Scale: 2.5 x 3.4 cm.
© John Veevaert

Priderite Crystallography

Axial Ratios:

a:c = 1:0.29317

Cell Dimensions:

a = 10.11, c = 2.964, Z = 1; V = 302.96 Den(Calc)= 3.92

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: I 4/m

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

By Intensity(I/I_o): 3.2(1), 5.05(0.7), 7.14(0.7),

Crystal Structure:

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Post J E , Von Dreele R B , Buseck P R , Acta Crystallographica, Section B , 38 (1982) p.1056-1065, Symmetry and cation displacements in hollandites:, structure refinements of hollandite, cryptomelane and priderite, Locality: West Kimberley, Australia, Note: Anisotropic displacement factors from ICSD

Physical Properties of Priderite

Cleavage:

[001] Perfect, [hk0] Fair

Color:

Reddish, Reddish black, Black.

Density:

3.86

Diaphaniety:

Opaque

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

7 - Quartz

Luster:

Adamantine

Magnetism:

Weakly paramagnetic

Streak:

gray

Optical Properties of Priderite

Dichroism (e):

black or deep reddish brown.

Dichroism (w):

deep reddish brown.

Gladstone-Dale:

CI meas= 0.183 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.196 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2806,KPDmeas= 0.285,KC= 0.349

Optical Data:

Uniaxial (-), w=2.1.

Calculated Properties of Priderite

Electron Density:

r_electron=3.65 gm/cc
note: r_Priderite=3.86 gm/cc.

Fermion Index

Fermion Index = 0.0685
Boson Index = 0.9315

Photoelectric:

PE_Priderite= 34.90 barns/electron
U=PE_Priderite x r_electron= 127.49 barns/cc.

Radioactivity:

GRapi = 67.14 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Priderite - barely detectable

Priderite Classification

Dana Class:

7.9.4.1 (7)Multiple Oxides

(7.9)where A B (O)2

(7.9.4)Dana Group

7.9.4.1 Priderite (K,Ba)(Ti,Fe)8O16 I 4/m 4/m

7.9.4.2 Ankangite Ba(Ti,V,Cr)8O16 I 4/m 4/m

Strunz Class:

IV/D.08-30 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.08 - Cryptomelane group

IV/D.08-10 Manjiroite (Na,K)(Mn,Mn)8O16·n(H2O) I 4/m 4/m

IV/D.08-20 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m

IV/D.08-25 Strontiomelane! SrMn6Mn2O16 P 2₁/m 2/m

IV/D.08-30 Priderite (K,Ba)(Ti,Fe)8O16 I 4/m 4/m

IV/D.08-33 Henrymeyerite! BaFeTi7O16 I 4/m 4/m

IV/D.08-35 Ankangite Ba(Ti,V,Cr)8O16 I 4/m 4/m

IV/D.08-40 Mannardite BaTi6V2O16·(H2O) I 4₁/a 4/m

IV/D.08-50 Redledgeite BaTi6Cr2O16·(H2O) I 4₁/a 4/m

IV/D.08-60 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m

IV/D.08-70 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m

IV/D.08-80 Cesarolite PbH2Mn3O8 HEX-R Trig

Other Priderite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

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Priderite

(K,Ba)(Ti,Fe+++)8O16
Dana No: 7.9.4.1 Strunz No: IV/D.08-30
Locality:

Notes: