Dickthomssenite
A valid IMA mineral species
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About Dickthomssenite
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
GUID
(UUID V4):
(UUID V4):
65a6d0d9-f35f-4c5d-a0e9-488c9bee0e09
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 |
---|---|---|
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 = 1.612 nβ = 1.674 nγ = 1.710
2V:
Measured: 74° , Calculated: 73°
Max Birefringence:
δ = 0.098
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:
High
Dispersion:
r < v
Optical Extinction:
Z = b; Y ∧ c = 17°.
Pleochroism:
Non-pleochroic
Chemistry of Dickthomssenite
Mindat Formula:
Mg(V2O6) · 7H2O
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
German:Dickthomssenit
Russian:Диктомссенит
Simplified Chinese:水镁钒石
Spanish:Dickthomssenita
Traditional Chinese:水鎂釩石
Common Associates
Associated Minerals Based on Photo Data:
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
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External Links:
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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
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).
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.
All localities listed without proper references should be considered as questionable.
USA | |
| Kampf et al. (2017) |
| 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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Firefly–Pigmay Mine, La Sal Creek Mining District, San Juan County, Utah, USA