Ammonioleucite Mineral Data

Ammonioleucite Mineral Data +

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General Ammonioleucite Information

Chemical Formula:

(NH4,K)AlSi2O6

Composition:

Molecular Weight = 202.45 gm

Potassium 4.83 % K 5.82 % K₂O

Aluminum 13.33 % Al 25.18 % Al₂O₃

Silicon 27.75 % Si 59.36 % SiO₂

Hydrogen 1.49 % H - % Calc as (NH₄)₂O

Nitrogen 5.19 % N 9.65 % (NH₄)₂O

Oxygen 47.42 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(NH₄)_0.75K_0.25AlSi₂O₆

Environment:

In veinlets, fractures, and cavities in hydrothermally altered crystalline schist, as powdery pseudomorphous replacements of analcime crystals.

IMA Status:

Approved IMA 1984

Locality:

In the Tatarazawa quarry, Fujioka, Gumma Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

For "ammonia" in its chemical composition and its relation to "leucite."

Synonym:

ICSD 54162

PDF 40-474

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Ammonioleucite Crystallography

Axial Ratios:

a:c = 1:1.03776

Cell Dimensions:

a = 13.214, c = 13.713, Z = 16; V = 2,394.42 Den(Calc)= 2.25

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: I 4₁/a

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

By Intensity(I/I_o): 5.43(1), 3.3(0.8), 5.53(0.5),

Crystal Structure:

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Yamada M , Miyawaki R , Nakai I , Izumi F , Nagashima K , Mineralogical Journal , 20 (1998) p.105-112, A Rietveld analysis of the crystal structure of ammonioleucite

Physical Properties of Ammonioleucite

Color:

White.

Density:

2.29

Diaphaniety:

Translucent

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Vitreous - Resinous

Streak:

white

Optical Properties of Ammonioleucite

Gladstone-Dale:

CI meas= -0.21 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.231 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2302,KPDmeas= 0.2262,KC= 0.187

Optical Data:

Uniaxial (+), w=1.518, e=1.518, bire=0.0000.

Calculated Properties of Ammonioleucite

Electron Density:

r_electron=2.31 gm/cc
note: r_{Ammonioleucite}=2.29 gm/cc.

Fermion Index

Fermion Index = 0.06488
Boson Index = 0.93512

Photoelectric:

PE_{Ammonioleucite}= 1.93 barns/electron
U=PE_{Ammonioleucite} x r_electron= 4.46 barns/cc.

Radioactivity:

GRapi = 70.20 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Ammonioleucite - barely detectable

Ammonioleucite Classification

Dana Class:

76.2.2.2 (76)Tectosilicate Al-Si Framework

(76.2)Feldspathoids and related species

(76.2.2)Leucite group

76.2.2.1 Leucite KAlSi2O6 I 4₁/a 4/m

76.2.2.2 Ammonioleucite (NH4,K)AlSi2O6 I 4₁/a 4/m

Strunz Class:

VIII/J.05-20 VIII - Silicates

VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders

VIII/J.05 - Leucite - Ammonioleucite series

VIII/J.05-10 Leucite KAlSi2O6 I 4₁/a 4/m

VIII/J.05-20 Ammonioleucite (NH4,K)AlSi2O6 I 4₁/a 4/m

Other Ammonioleucite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.71,p1022-1027,1986) OPTIC PROP.(Am.Min.,Vol.71,p1022-1027,1986)

See Also:

Links to other databases for Ammonioleucite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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

Ammonioleucite

(NH4,K)AlSi2O6
Dana No: 76.2.2.2 Strunz No: VIII/J.05-20
Locality:

Notes: