Dickthomssenite
A valid IMA mineral species
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About Dickthomssenite
Dick W. Thomssen
Formula:
Mg(V2O6) · 7H2O
Colour:
Light golden brown
Lustre:
Vitreous
Hardness:
2½
Specific Gravity:
1.96 - 2.09
Crystal System:
Monoclinic
Name:
In honor of Richard ("Dick") W. Thomssen [b. April 23, 1933 USA], consulting geologist, Dayton, Nevada, USA.
This page provides mineralogical data about Dickthomssenite.
Unique Identifiers
Mindat ID:
11216
Long-form identifier:
mindat:1:1:11216:1
IMA Classification of Dickthomssenite
Classification of Dickthomssenite
4.HD.25
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
D : Inovanadates
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
D : Inovanadates
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 for Standard |
|---|---|---|
| Dth | 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 Dickthomssenite
Vitreous
Transparency:
Translucent
Colour:
Light golden brown
Streak:
White
Hardness:
2½ on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Perfect
{100}
{100}
Fracture:
Hackly
Density:
1.96 - 2.09 g/cm3 (Measured) 2.04 g/cm3 (Calculated)
Optical Data of Dickthomssenite
Type:
Biaxial (-)
RI values:
nα = 1.6124 nβ = 1.674 nγ = 1.7104
2V:
Measured: 74° , Calculated: 73°
Max. Birefringence:
δ = 0.098
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
r < v
Optical Extinction:
Z = b; Y ∧ c = 17°.
Pleochroism:
Non-pleochroic
Chemistry of Dickthomssenite
Mindat Formula:
Mg(V2O6) · 7H2O
Element Weights:
Elements listed:
Crystallography of Dickthomssenite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Cell Parameters:
a = 38.954 Å, b = 7.201 Å, c = 16.3465 Å
β = 97.602°
β = 97.602°
Ratio:
a:b:c = 5.41 : 1 : 2.27
Unit Cell V:
4544 ų
Z:
16
Twinning:
None mentioned
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.704 Å | (100) |
| 8.117 Å | (60) |
| 5.843 Å | (100) |
| 4.061 Å | (50) |
| 3.139 Å | (90) |
| 2.920 Å | (60) |
| 2.707 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47e : [Vanadates, chromates, manganates] |
Type Occurrence of Dickthomssenite
General Appearance of Type Material:
Crystals ranging from 0.25-mm needle-like to 0.5 x 1.5 mm platy, prismatic crystals with basal terminations. The crystals occur in fibroradial groups to a length of 5 mm, creating solid coverage to 1.5 x 2.5 cm.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA.
Geological Setting of Type Material:
Coating on sandstone.
Associated Minerals at Type Locality:
Synonyms of Dickthomssenite
Other Language Names for Dickthomssenite
Dutch:Dickthomsseniet
German:Dickthomssenit
Russian:Диктомссенит
Simplified Chinese:水镁钒石
Spanish:Dickthomssenita
Traditional Chinese:水鎂釩石
Common Associates
Associations Based on Photo Data:
| 8 photos of Dickthomssenite associated with Lasalite | Na2Mg2(V10O28) · 20H2O |
| 6 photos of Dickthomssenite associated with Metarossite | Ca(V2O6) · 2H2O |
| 4 photos of Dickthomssenite associated with Native Selenium | Se |
| 2 photos of Dickthomssenite associated with Rossite | Ca(VO3)2 · 4H2O |
| 2 photos of Dickthomssenite associated with Hewettite | CaV6O16 · 9H2O |
| 2 photos of Dickthomssenite associated with Simplotite | CaV4+4O9 · 5H2O |
| 1 photo of Dickthomssenite associated with Trebiskyite | Na3Mg2[TiV9O28] · 22H2O |
Related Minerals - Strunz-mindat Grouping
| 4.HD. | Pseudodickthomssenite | Mg(VO3)2 · 8H2O |
| 4.HD.05 | Rossite | Ca(VO3)2 · 4H2O |
| 4.HD.10 | Metarossite | Ca(V2O6) · 2H2O |
| 4.HD.15 | Munirite | NaVO3 · 1.9H2O |
| 4.HD.20 | Metamunirite | NaVO3 |
| 4.HD.30 | Ansermetite | Mn2+(V2O6) · 4H2O |
Fluorescence of Dickthomssenite
Not fluorescent.
Other Information
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 Dickthomssenite
mindat.org URL:
https://www.mindat.org/min-11216.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Dickthomssenite
Reference List:
Hughes, J. M., Cureton, F. E., Marty, J., Gault, R. A., Gunter, M. E., Campana, C. F., Rakovan, J., Sommer, A., Brueseke, M. E. (2001) Dickthomssenite, Mg(V2O6)·7H2O, a new mineral species from the Firefly-Pigmay Mine, Utah: descriptive mineralogy and arrangement of atoms. The Canadian Mineralogist, 39 (6) 1691-1700 doi:10.2113/gscanmin.39.6.1691
Localities for Dickthomssenite
Showing 8 localities.
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.
USA | |
| Kampf et al. (2017) |
| Travis Olds collection |
| Carnegie Museum of Natural History ... | |
| Kasatkin et al. (2014) +1 other reference |
| Chuck Adan specimen. Analyzed by Tony ... | |
| EDX results from Kaygeedee Minerals +1 other reference |
| Hughes et al. (2001) |
| Hughes et al. (2008) |
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Blue Streak Mine, Montrose County, Colorado, USA