Tschermigite Mineral Data

Tschermigite Mineral Data +

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General Tschermigite Information

Chemical Formula:

(NH4)Al(SO4)2·12(H2O)

Composition:

Molecular Weight = 453.33 gm

Aluminum 5.95 % Al 11.25 % Al₂O₃

Hydrogen 0.89 % H - % Calc as (NH₄)₂O

Hydrogen 5.34 % H 47.69 % H₂O

Sulfur 14.15 % S 35.32 % SO₃

Nitrogen 3.09 % N 5.74 % (NH₄)₂O

Oxygen 70.59 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(NH₄)Al(SO₄)₂·12(H₂O)

Environment:

Burning coal seams, mines, and dumps and bituminous shales. Found in fumaroles.

IMA Status:

Valid Species (Pre-IMA) 1853

Locality:

Cermniky, (Tschermig), Czechoslovakia. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Synonym:

Ammonia alum

Deoderant Stone

ICSD 100856

PDF 22-Jul

Tschermigite Image

Images:

Tschermigite

Comments: Clear crystal of tschernichite in a vug.
Location: Goble, Colombia County, Oregon, USA. Scale: Not Given.
© Thomas Witzke / Abraxas-Verlag

Images:

Tschermigite Berndtite

Comments: Yellow crystalline berndtite on tschermigite.
Location: Shamokin, Northumberland County, Pennsylvania, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Tschermigite Crystallography

Cell Dimensions:

a = 12.215, Z = 4; V = 1,822.55 Den(Calc)= 1.65

Crystal System:

Isometric - DiploidalH-M Symbol (2/m 3) Space Group: P a3

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

By Intensity(I/I_o): 4.327(1), 4.079(0.8), 3.273(0.75),

Forms:

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Forms: [ 0 1 1] [ 1 0 0] [ 1 1 1]

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Crystal Structure:

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Abdeen A M , Will G , Schafer W , Kirfel A , Bargouth M O , Recker K , Weiss A , Zeitschrift fur Kristallographie , 157 (1981) p.147-166, X-ray and neutron diffraction study of alums:, II. The crystal structure of methylammonium aluminium alum, III. The crystal structure of ammonium aluminium alum, Note: Neutron data

Physical Properties of Tschermigite

Cleavage:

[100] Perfect

Color:

White, Colorless.

Density:

1.65

Diaphaniety:

Transparent to translucent

Fracture:

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

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Habit:

Deliquescent - Crystals absorb water from the air and melt or otherwise deteriorate.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

1.5-2 - Talc-Gypsum

Luminescence:

None.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Tschermigite

Gladstone-Dale:

CI meas= -0.122 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.122 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2782,KPDmeas= 0.2782,KC= 0.2479

Optical Data:

Isotropic, n=1.459.

Calculated Properties of Tschermigite

Electron Density:

r_electron=1.75 gm/cc
note: r_Tschermigite=1.65 gm/cc.

Fermion Index

Fermion Index = 0.03219
Boson Index = 0.96781

Photoelectric:

PE_Tschermigite= 1.16 barns/electron
U=PE_Tschermigite x r_electron= 2.03 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tschermigite is Not Radioactive

Tschermigite Classification

Dana Class:

29.5.5.3 (29)Hydrated Acid and Sulfates

(29.5)where A B (XO4)2 · x(H2O)

(29.5.5)Alum Group

29.5.5.1 Potassium-alum KAl(SO4)2·12(H2O) P a3 2/m 3

29.5.5.2 Sodium-alum NaAl(SO4)2·12(H2O) P a3 2/m 3

29.5.5.3 Tschermigite (NH4)Al(SO4)2·12(H2O) P a3 2/m 3

29.5.5.4 Lonecreekite (NH4)(Fe,Al)(SO4)2·12(H2O) P a3 2/m 3

29.5.5.5 Lanmuchangite! TlAl(SO4)2·12(H2O) P a3 2/m 3

Strunz Class:

VI/C.14-30 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium and very big size

VI/C.14 - Sodium alum - Zincovoltaite series

VI/C.14-10 Sodium-alum NaAl(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-20 Potassium-alum KAl(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-30 Tschermigite (NH4)Al(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-40 Lonecreekite (NH4)(Fe,Al)(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-45 Lanmuchangite! TlAl(SO4)2·12(H2O) P a3 2/m 3

VI/C.14-50 Voltaite K2Fe5Fe3Al(SO4)12·18(H2O) F d3c 4/m 3 2/m

VI/C.14-60 Zincovoltaite K2Zn5Fe3Al(SO4)12·18(H2O) F d3c 4/m 3 2/m

Other Tschermigite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

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

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Tschermigite

(NH4)Al(SO4)2·12(H2O)
Dana No: 29.5.5.3 Strunz No: VI/C.14-30
Locality:

Notes: