Tschermigite (original) (raw)

A valid IMA mineral species - grandfathered

About TschermigiteHide

This section is currently hidden. Click the show button to view.

Formula:

(NH4)Al(SO4)2 · 12H2O

Colour:

Colourless, white; colourless in transmitted light

Name:

Named after its discovery locality, Tschermig (now Cermniky), near Kadan, Czech Republic.

Note: Specimens frequently offered for sale of 'tschermigite' as large, good quality purple crystals on matrix are artificially created specimens made by growing crystals of this ammonium alum in a laboratory. Godovikovite is a dehydration product of tschermigite sometimes occurring on burning coal dumps.

Unique IdentifiersHide

This section is currently hidden. Click the show button to view.

Long-form identifier:

mindat:1:1:4036:1

9d64c18f-6a7d-4f1e-a831-9d3406238942

IMA Classification of TschermigiteHide

This section is currently hidden. Click the show button to view.

Approved, 'Grandfathered' (first described prior to 1959)

Type description reference:

Classification of TschermigiteHide

This section is currently hidden. Click the show button to view.

7.CC.20

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
C : With medium-sized and large cations

29.5.5.3

29 : HYDRATED ACID AND NORMAL SULFATES
5 : AB(XO4)2·xH2O

25.6.20

25 : Sulphates
6 : Sulphates of Al and Tl

Mineral SymbolsHide

This section is currently hidden. Click the show button to view.

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of TschermigiteHide

This section is currently hidden. Click the show button to view.

Comment:

Crystals vitreous; fibrous masses silky

Colour:

Colourless, white; colourless in transmitted light

Density:

1.645 g/cm3 (Measured) 1.641 g/cm3 (Calculated)

Optical Data of TschermigiteHide

This section is currently hidden. Click the show button to view.

Birefringence:

Anomalous - due to strain arising in mechanical deformation or compositional variation.

Chemistry of TschermigiteHide

This section is currently hidden. Click the show button to view.

Mindat Formula:

(NH4)Al(SO4)2 · 12H2O

Crystallography of TschermigiteHide

This section is currently hidden. Click the show button to view.

Class (H-M):

m_3(2/m_3) - Diploidal

Cell Parameters:

a = 12.242``(1) Å

Unit Cell V:

1,834.67 ų (Calculated from Unit Cell)

Morphology:

Octahedral (artificial crystals from pure water solutions); fibrous, columnar massive; as efflorescences.

Crystal StructureHide

This section is currently hidden. Click the show button to view.

Load
Unit Cell |Unit Cell Packed
2x2x2 |3x3x3 |4x4x4

Show
Big Balls |Small Balls |Just Balls |Spacefill
Polyhedra Off |Si Polyhedra |All Polyhedra
Remove metal-metal sticks

Display Options
Black Background |White Background
Perspective On |Perspective Off
2D |Stereo |Red-Blue |Red-Cyan

View
CIF File Best |x |y |z |a |b |c

Rotation
Stop |Start

Labels
Console Off |On |Grey |Yellow

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0019048	Tschermigite	Larson A C, Cromer D T (1967) Refinement of the alum structures. III. X-ray study of the a alums, K, Rb and NH4Al(SO4)2*12H2O Acta Crystallographica 22 793-800		1967	Synthetic	0	293
0010843	Tschermigite	Abdeen A M, Will G, Schaefer W, Kirfel A, Bargouth M O, Recker K, Weiss A (1981) X-ray and neutron diffraction study of alums II. The crystal structure of methylammonium aluminium alum III. The crystal structure of ammonium aluminium alum Zeitschrift fur Kristallographie 157 147-166		1981	synthetic	0	293
0010844	Tschermigite	Abdeen A M, Will G, Schafer W, Kirfel A, Bargouth M O, Recker K, Weiss A (1981) X-ray and neutron diffraction study of alums: II. The crystal structure of methylammonium aluminium alum III. The crystal structure of ammonium aluminium alum Zeitschrift fur Kristallographie 157 147-166		1981	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

This section is currently hidden. Click the show button to view.

Image Loading

Radiation - Copper Kα

Data Set:

Data courtesy of RRUFF project at University of Arizona, used with permission.

Powder Diffraction Data:

Geological EnvironmentHide

This section is currently hidden. Click the show button to view.

Geological Setting:

In lignite (brown-coal) beds and bituminous shales; in fumaroles; in burning coal seams and coal mine waste heaps.

Type Occurrence of TschermigiteHide

This section is currently hidden. Click the show button to view.

Reference:

von Kobel F (1858) Es sind in Salzsäure, einige auch in Wasser, ohne merklichen Rückstand auflöslich. Die Aufl. bildet keine Gallerte. in Tafeln zur Bestimmung der Mineralien mittelst einfacher chemischer Versuche auf trockenem und nassem Wege., Joseph Lindauer'sche Buchhandlung (München) 47-47

Synonyms of TschermigiteHide

This section is currently hidden. Click the show button to view.

Other Language Names for TschermigiteHide

This section is currently hidden. Click the show button to view.

Relationship of Tschermigite to other SpeciesHide

This section is currently hidden. Click the show button to view.

Other Members of this group:

Common AssociatesHide

This section is currently hidden. Click the show button to view.

Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

This section is currently hidden. Click the show button to view.

Other InformationHide

This section is currently hidden. Click the show button to view.

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for TschermigiteHide

This section is currently hidden. Click the show button to view.

References for TschermigiteHide

This section is currently hidden. Click the show button to view.

Reference List:

**Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.**pp.475-476

Localities for TschermigiteHide

This section is currently hidden. Click the show button to view.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

This section is currently hidden. Click the show button to view.

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.