Kosnarite Mineral Data

Kosnarite Mineral Data +

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General Kosnarite Information

Chemical Formula:

KZr++++2(PO4)3

Composition:

Molecular Weight = 506.46 gm

Potassium 7.72 % K 9.30 % K₂O

Zirconium 36.02 % Zr 48.66 % ZrO₂

Phosphorus 18.35 % P 42.04 % P₂O₅

Oxygen 37.91 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KZr₂(PO₄)₃

IMA Status:

Approved IMA 1993

Locality:

Mt Mica pegmatite, Paris, Oxford Co., Maine, USA Link to MinDat.org Location Data.

Name Origin:

Named for Richard A. Kosnar (1946-), mineral dealer.

Synonym:

ICSD 4427

IMA1991-022

PDF 46-1397

Kosnarite Image

Images:

Kosnarite

Comments: Pale bluish crystals of kosnarite in matrix.
Location: Mt Mica mine, Paris, Oxford Co., Maine, USA. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Kosnarite

Comments: Transparent crystals of kosnarite on matrix.
Location: Itinga Mine, Minas Gerais, Brazil. Scale: Crystal size 2 mm.
© John Veevaert

Images:

Kosnarite Zanazziite

Comments: Beige crystals of kosnarite with pinkish, radial aggregates of zanazziite on whte albite matrix.
Location: Jenipapo, Itinga, Minas Gerais, Brazil. Scale: Picture size 6 cm.
© Fabre Minerals

Kosnarite Crystallography

Axial Ratios:

a:c = 1:2.74858

Cell Dimensions:

a = 8.687, c = 23.877, Z = 6; V = 1,560.45 Den(Calc)= 3.23

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3c

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

By Intensity(I/I_o): 4.329(1), 2.928(0.9), 3.806(0.9),

Crystal Structure:

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Sljukic M , Matkovic B , Prodic B , Anderson D , Zeitschrift fur Kristallographie , 130 (1969) p.148-161, The crystal structure of KZr2(PO4)3, Locality: synthetic

Physical Properties of Kosnarite

Cleavage:

[102] Perfect

Color:

Colorless, Gray blue, Light green.

Density:

3.194

Diaphaniety:

Transparent

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Kosnarite

Gladstone-Dale:

CI meas= -0.059 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.047 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2071,KPDmeas= 0.2095,KC= 0.1978

Optical Data:

Uniaxial (+), w=1.656, e=1.682, bire=0.0260.

Calculated Properties of Kosnarite

Electron Density:

r_electron=3.06 gm/cc
note: r_Kosnarite=3.23 gm/cc.

Fermion Index

Fermion Index = 0.04061
Boson Index = 0.95939

Photoelectric:

PE_Kosnarite= 50.56 barns/electron
U=PE_Kosnarite x r_electron= 154.76 barns/cc.

Radioactivity:

GRapi = 105.56 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Kosnarite - barely detectable

Kosnarite Classification

Dana Class:

38.4.12.1 (38)Anhydrous Phosphates, etc

(38.4)A+ XO4

(38.4.12)Dana Group

38.4.12.1 Kosnarite KZr2(PO4)3 R 3c 3 2/m

Strunz Class:

VII/A.17-10 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions. cations of medium size: Mostly Fe, Mn

VII/A.17 - Kosnarite series

VII/A.17-10 Kosnarite KZr2(PO4)3 R 3c 3 2/m

Other Kosnarite Information

References:

PHYS. PROP.(Am.Min.,Vol.78,p653-656,1993) OPTIC PROP.(Am.Min.,Vol.78,p653-656,1993)

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

Kosnarite

KZr++++2(PO4)3
Dana No: 38.4.12.1 Strunz No: VII/A.17-10
Locality:

Notes: