Letovicite Mineral Data

General Letovicite Information

Chemical Formula:

(NH4)3H(SO4)2

Composition:

Molecular Weight = 247.25 gm

Hydrogen 4.89 % H - % Calc as (NH₄)₂O

Hydrogen 0.41 % H 3.64 % H₂O

Sulfur 25.94 % S 64.76 % SO₃

Nitrogen 16.99 % N 31.59 % (NH₄)₂O

Oxygen 51.77 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(NH₄)₃H(SO₄)₂

Environment:

Formed during the burning of waste coal heaps.

IMA Status:

Valid Species (Pre-IMA) 1932

Locality:

Letovice, Moravia, Czech Republic. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Letovicite + Pronunciation

Synonym:

ICSD 60058

PDF 35-100

Letovicite Image

Images:

Letovicite

Comments: Pearly opaque white crystalline letovicite on matrix.
Location: Kladno, Stredocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Letovicite Crystallography

Axial Ratios:

a:b:c =0.5771:1:0.8131

Cell Dimensions:

a = 5.87, b = 10.17, c = 8.27, Z = 2; alpha = 101.1°, beta = 111.1°, gamma = 89.9° V = 451.98 Den(Calc)= 1.82

Crystal System:

Triclinic Space Group: P1,P 1

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

By Intensity(I/I_o): 4.95(1), 4.98(0.85), 3.77(0.8),

Physical Properties of Letovicite

Cleavage:

{001} Distinct

Color:

Colorless, White.

Density:

1.83

Diaphaneity:

Transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

1-2 - Between Talc and Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Letovicite

Gladstone-Dale:

CI meas= -1.211 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -1.223 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2824,KPDmeas= 0.2809,KC= 0.127
Ncalc = 1.23

Optical Data:

Biaxial (-), a=1.501, b=1.516, g=1.525, bire=0.0240, 2V(Calc)=74, 2V(Meas)=75.

Calculated Properties of Letovicite

Electron Density:

Bulk Density (Electron Density)=1.92 gm/cc
note: Specific Gravity of Letovicite =1.83 gm/cc.

Fermion Index:

Fermion Index = 0.17
Boson Index = 0.83

Photoelectric:

PE_Letovicite= 1.59 barns/electron
U=PE_Letovicite x rElectron Density= 3.07 barns/cc.

Radioactivity:

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

Letovicite Classification

Dana Class:

28.01.03.01 (28)Anhydrous Acid and Sulfates

(28.01)(Anhydrous, Acid)

(28.01.03)Dana Group

28.01.03.01 Letovicite (NH4)3H(SO4)2 P1,P 1 Tri

Strunz Class:

07.AD.20 07 - SULFATES (SELENATES, TELLURATES)

07.A - Sulfates (selenates, etc.) without Additional Anions, without H2O

07.AD -With only large cations

07.AD.20 Letovicite (NH4)3H(SO4)2 P1,P 1 Tri

Other Letovicite Information

References:

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

See Also:

Links to other databases for Letovicite :
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

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

Letovicite

(NH4)3H(SO4)2
Dana No: 28.01.03.01 Strunz No: 07.AD.20
Locality:

Notes:

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