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Dietzeite

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Iquique, Iquique Province, Tarapacá Region, Chile
© Knut Eldjarn




Formula:
Ca
 
2
(IO
 
3
)
 
2
(CrO
 
4
) · H
 
2
O
System:MonoclinicColour:Golden yellow
Hardness:3½
Name:After August Dietze, chemist, who first described the species.
This page provides mineralogical data about Dietzeite.

Classification of Dietzeite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/L.01-30
Nickel-Strunz 10th (pending) edition ID:4.KD.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
K : Iodates: Trigonal [IO3] pyramids (mostly).
D : Iodates with additional anions, with H2O
Dana 7th edition ID:23.1.1.1
Dana 8th edition ID:23.1.1.1

23 : COMPOUND IODATES
1 : Miscellaneous
Hey's CIM Ref.:29.5

29 : Iodates
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Type Occurrence of Dietzeite

Type Locality:Lautaro Mine, Morro Moreno, Antofagasta Region, Chile
Year of Discovery:1894

Physical Properties of Dietzeite

Diaphaneity (Transparency):Transparent
Colour:Golden yellow
Streak:Light yellow
Hardness (Mohs):3½
Cleavage:Imperfect/Fair
On {100} incomplete.
Fracture:Conchoidal
Density (measured):3.617 - 3.698 g/cm3
Density (calculated):3.61 g/cm3

Crystallography of Dietzeite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a}
Cell Parameters:a = 10.11Å, b = 7.23Å, c = 13.96Å
β = 106.62°
Ratio:a:b:c = 1.398 : 1 : 1.931
Unit Cell Volume:V 977.78 ų (Calculated from Unit Cell)
Morphology:Crystals tabular {100} and elongated [001]. Fibrous crusts; columnar.

Optical Data of Dietzeite

Type:Biaxial (-)
RI values: nα = 1.825 nβ = 1.842 nγ = 1.857
2V:Measured: 86° , Calculated: 84°
Maximum Birefringence:δ = 0.032

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:small

Chemical Properties of Dietzeite

Formula:
Ca
 
2
(IO
 
3
)
 
2
(CrO
 
4
) · H
 
2
O
Essential elements:Ca, Cr, H, I, O
All elements listed in formula:Ca, Cr, H, I, O

Relationship of Dietzeite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.KD.10George-ericksenite
Na
 
6
CaMg(IO
 
3
)
 
6
(CrO
 
4
)
 
2
 · 12H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
29.1Salesite
Cu(IO
 
3
)(OH)
29.2Bellingerite
Cu
 
3
(IO
 
3
)
 
6
 · 2H
 
2
O
29.3Lautarite
Ca(IO
 
3
)
 
2
29.4Brüggenite
Ca(IO
 
3
)
 
2
 · H
 
2
O
29.6Seeligerite
Pb
 
3
(IO
 
3
)OCl
 
3
29.7Schwartzembergite
Pb
 
5
H
 
2
(IO
 
2
)O
 
4
Cl
 
3
29.8Hectorfloresite
Na
 
9
(SO
 
4
)
 
4
(IO
 
3
)

Other Names for Dietzeite

Synonyms:
Iodchromate
Other Languages:
German:Dietzeit
Jodchromate
Russian:Дитцеит
Spanish:Dietzeita

Other Information

Other Information:Slowly soluble in cold water, faster in hot water.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Dietzeite

Reference List:

- +
Dietze (1891) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 19: 449 (as Jodchromate).

Osann (1894) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 23: 588 (as Dietzeit).

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 68.

Gossner and Mussgnug (1930) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 75: 410.

Bandy (1937) American Mineralogist: 22: 929.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 318-319.

Canadian Mineralogist (1993): 31: 313-319.

Internet Links for Dietzeite

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  • Dietzeite details from Handbook of Mineralogy (PDF)
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    • Localities for Dietzeite

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Chile
     
    • Antofagasta Region
      • Antofagasta Province
    		No reference listed
      • Morro Moreno
    		Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig (1894): 23: 588; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 319.
      • Tocopilla Province
    		Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 319; Anthony, J.W., R.A. Bideaux, K.W. Bladh, M.C. Nichols: Handbook of Mineralogy, Vol. V (2003).
    Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 646.
    • Tarapacá Region
      • Iquique Province
    		American Mineralogist: 79: 1003-1008.
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