Zektzerite Mineral Data

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General Zektzerite Information

Chemical Formula:

NaLiZrSi6O15

Composition:

Molecular Weight = 529.66 gm

Sodium 4.34 % Na 5.85 % Na₂O

Lithium 1.31 % Li 2.82 % Li₂O

Zirconium 17.22 % Zr 23.26 % ZrO₂

Silicon 31.82 % Si 68.06 % SiO₂

Oxygen 45.31 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaLiZrSi₆O₁₅

Environment:

In miarolitic cavities and isolated grains in alkaline syenite of the Golden Horn batholith.

IMA Status:

Approved IMA 1977

Locality:

Washington Pass, Okanogan County, Washington, USA Link to MinDat.org Location Data.

Name Origin:

Named for Jack Zektzer (1936-), mathematician and geologist of Seattle, Washington, USA.

Name Pronunciation:

Zektzerite + Pronunciation

Synonym:

ICSD 100631

PDF 29-835

Zektzerite Image

Images:

Zektzerite

Comments: Pale peach-colored crystal of zektzerite on white feldspar.
Location: Golden Horn batholith, Okanogan County, Oregon, USA. Scale: Crystal size 1 cm.
© Dave Barthelmy

Zektzerite Crystallography

Axial Ratios:

a:b:c =0.8257:1:0.5856

Cell Dimensions:

a = 14.33, b = 17.354, c = 10.164, Z = 8; V = 2,527.61 Den(Calc)= 2.78

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C mca

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

By Intensity(I/I_o): 4.85(1), 3.145(0.85), 7.19(0.78),

Crystal Structure:

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Ghose S , Wan C , American Mineralogist , 63 (1978) p.304-310, Zektzerite, NaLiZrSi6O15: a silicate with six-tetrahedral-repeat double chains, Locality: Miarolitic cavities of the Golden Horn batholith, near Washington Pass, North Cascades, Washington, USA

Physical Properties of Zektzerite

Cleavage:

{100} Perfect, {010} Perfect

Color:

Colorless, Pink.

Density:

2.79

Diaphaneity:

Transparent

Hardness:

6 - Orthoclase

Luminescence:

Fluorescent, Short UV=light yellow.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Zektzerite

Gladstone-Dale:

CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2098,KPDmeas= 0.2091,KC= 0.2104
Ncalc = 1.59

Optical Data:

Biaxial (-), a=1.582, b=1.584, g=1.584, bire=0.0020, 2V(Calc)=0, 2V(Meas)=0. Dispersion r > v weak.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Zektzerite

Electron Density:

Bulk Density (Electron Density)=2.71 gm/cc
note: Specific Gravity of Zektzerite =2.78 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Zektzerite= 24.04 barns/electron
U=PE_Zektzerite x rElectron Density= 65.12 barns/cc.

Radioactivity:

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

Zektzerite Classification

Dana Class:

66.03.04.02 (66)Inosilicate Double-Width Unbranched Chains, W=2

(66.03)with chains P>2

(66.03.04)P=6 (Tahualite group)

66.03.04.01 Tuhualite [](Na,K)FeFe[Si6O15] C mca 2/m 2/m 2/m

66.03.04.02 Zektzerite NaLiZrSi6O15 C mca 2/m 2/m 2/m

66.03.04.03 Emeleusite Na4Li2Fe2Si12O30 Pnna 2/m 2/m 2/m

Strunz Class:

09.DN.05 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DN -Inosilicates with 6-periodic double chains

09.DN.05 Emeleusite Na4Li2Fe2Si12O30 Pnna 2/m 2/m 2/m

09.DN.05 Tuhualite [](Na,K)FeFe[Si6O15] C mca 2/m 2/m 2/m

09.DN.05 Zektzerite NaLiZrSi6O15 C mca 2/m 2/m 2/m

Other Zektzerite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990;Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Zektzerite :
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
15 - WWW-MINCRYST

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Ask about Zektzerite here :
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Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Zektzerite

NaLiZrSi6O15
Dana No: 66.03.04.02 Strunz No: 09.DN.05
Locality:

Notes: