Dietzeite
A valid IMA mineral species - grandfathered
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About Dietzeite
Formula:
Ca2(IO3)2(CrO4) · H2O
Colour:
Golden yellow
Hardness:
3½
Specific Gravity:
3.617 - 3.698
Crystal System:
Monoclinic
Name:
After August Dietze (-1893), Chilean chemist, who first described the species.
Type Locality:
This page provides mineralogical data about Dietzeite.
Unique Identifiers
Mindat ID:
1290
Long-form identifier:
mindat:1:1:1290:0
GUID
(UUID V4):
(UUID V4):
896824fc-e8fd-4376-aab8-e25c56eee20f
IMA Classification of Dietzeite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1891
Classification of Dietzeite
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
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 ed.:
23.1.1.1
23.1.1.1
23 : COMPOUND IODATES
1 : Miscellaneous
23 : COMPOUND IODATES
1 : Miscellaneous
29.5
29 : Iodates
29 : Iodates
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Die | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Dietzeite
Transparency:
Transparent
Colour:
Golden yellow
Streak:
Light yellow
Hardness:
3½ on Mohs scale
Cleavage:
Imperfect/Fair
On {100} incomplete.
On {100} incomplete.
Fracture:
Conchoidal
Density:
3.617 - 3.698 g/cm3 (Measured) 3.61 g/cm3 (Calculated)
Optical Data of Dietzeite
Type:
Biaxial (-)
RI values:
nα = 1.825 nβ = 1.842 nγ = 1.857
2V:
Measured: 86° , Calculated: 84°
Max Birefringence:
δ = 0.032
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
small
Chemistry of Dietzeite
Mindat Formula:
Ca2(IO3)2(CrO4) · H2O
Crystallography of Dietzeite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 10.118(1) Å, b = 7.238(1) Å, c = 13.965(2) Å
β = 106.62(1)°
β = 106.62(1)°
Ratio:
a:b:c = 1.398 : 1 : 1.929
Unit Cell V:
979.99 ų (Calculated from Unit Cell)
Morphology:
Crystals tabular {100} and elongated [001]. Fibrous crusts; columnar. Forms observed include {100}, {010}, {001}, {110}, {210}, {101}, {221}, {223}.
Comment:
Cell parameters from Burns and Hawthorne 1993.
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005297 | Dietzeite | Burns P C, Hawthorne F C (1993) The crystal structure of dietzeite, Ca2H20(IO3)2(CrO4), a heteropolyhedral framework mineral The Canadian Mineralogist 31 313-319 |  | 1993 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.48 Å | (100) |
| 3.13 Å | (100) |
| 3.61 Å | (90) |
| 2.98 Å | (60) |
| 2.88 Å | (60) |
| 1.870 Å | (60) |
| 1.741 Å | (50) |
Comments:
Oficina Lautaro, Chile. ICDD 25-132.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 25 : Evaporites (prebiotic) |
Type Occurrence of Dietzeite
General Appearance of Type Material:
Parallel fibrous and columnar aggregates, often mixed with other salts, as well as isolated grains. Crystals are small and rare, reaching 2 mm.
Place of Conservation of Type Material:
No designated type material.
Synonyms of Dietzeite
Other Language Names for Dietzeite
Related Minerals - Strunz-mindat Grouping
| 4.KD.10 | George-ericksenite | Na6CaMg(IO3)6(CrO4)2 · 12H2O |
Other Information
Notes:
Slowly soluble in cold water, faster in hot water.
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 Dietzeite
mindat.org URL:
https://www.mindat.org/min-1290.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Dietzeite
Reference List:
Larsen, Esper S. (1921) The microscopic determination of the nonopaque minerals. Bulletin Vol. 679. US Geological Survey doi:10.3133/b679 p.68
Localities for Dietzeite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Chile | |
| USGS Bulletin 491 |
| Zeitschrift für Kristallographie et al. (1894) +1 other reference |
| Palache et al. (1951) +1 other reference |
| Palache et al. (1951) | |
| Marta et al. (1996) | |
| Konnert et al. (1994) |
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Maria Elena Mine, Oficina María Elena, María Elena, Tocopilla Province, Antofagasta, Chile