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Dickthomssenite

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Formula:
Mg(V
 
2
O
 
6
) · 7H
 
2
O
System:MonoclinicColour:Light golden brown
Hardness:
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.

Classification of Dickthomssenite

IMA status:Approved 2000
Nickel-Strunz 10th (pending) edition ID:4.HD.25

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
D : Inovanadates
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Type Occurrence of Dickthomssenite

Type Locality:Firefly–Pigmay Mine, La Sal Quadrangle, San Juan Co., Utah, USA
Geological Setting of type material:Coating on sandstone.
Associated Minerals at type locality:
UraniniteTyuyamuniteTennantiteSherwooditeSelenium
SeleniumRossiteRoscoelitePyritePascoite
MontroseiteHewettiteGalenaDevillineCorvusite
CoffiniteClausthaliteCarnotite

Physical Properties of Dickthomssenite

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:Light golden brown
Streak:White
Hardness (Mohs):
Hardness Data:Measured
Tenacity:Brittle
Cleavage:Perfect
{100}
Fracture:Hackly
Density (measured):1.96 - 2.09 g/cm3
Density (calculated):2.04 g/cm3

Crystallography of Dickthomssenite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b
Cell Parameters:a = 38.954Å, b = 7.201Å, c = 16.3465Å
β = 97.602°
Ratio:a:b:c = 5.41 : 1 : 2.27
Unit Cell Volume:V 4544 ų
Z:16
Twinning:None mentioned
X-Ray Powder Diffraction:
d-spacingIntensity
9.704 (100)
8.117 (60)
5.843 (100)
4.061 (50)
3.139 (90)
2.920 (60)
2.707 (50)

Optical Data of Dickthomssenite

Type:Biaxial (-)
RI values: nα = 1.612 nβ = 1.674 nγ = 1.710
2V:Measured: 74° , Calculated: 73°
Maximum Birefringence:δ = 0.098

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:r < v
Pleochroism:Non-pleochroic

Chemical Properties of Dickthomssenite

Formula:
Mg(V
 
2
O
 
6
) · 7H
 
2
O
Simplified for copy/paste:Mg(V2O6)·7H2O
Essential elements:H, Mg, O, V
All elements listed in formula:H, Mg, O, V
Analytical Data:Electron microprobe data elevated due to sample decomposition under electron beam. Results recalculated to give 7H2O and oxides recalculated to 100%.
MgO (10.99%)
FeO (0.41%)
V2O5 (52.43%)
H2O (36.17%)

Total: 100.00 wt.%
Empirical Formula:
(Mg
 
0.95
Fe
 
0.02
)
 
Σ0.97
(V
 
2
O
 
6
) · 7.00H
 
2
O

Relationship of Dickthomssenite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.HD.05Rossite
Ca(V
 
2
O
 
6
) · 4H
 
2
O
4.HD.10Metarossite
Ca(V
 
2
O
 
6
) · 2H
 
2
O
4.HD.15Munirite
NaVO
 
3
· 1.9H
 
2
O
4.HD.20Metamunirite
NaVO
 
3
4.HD.30Ansermetite
Mn
2+
 
(V
 
2
O
 
6
) · 4H
 
2
O

Other Names for Dickthomssenite

Synonyms:
IMA2000-047
Other Languages:
German:Dickthomssenit
Russian:Диктомссенит
Simplified Chinese:水镁钒石
Spanish:Dickthomssenita
Traditional Chinese:水鎂釩石

Other Information

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 Dickthomssenite

Reference List:

- +
Canadian Mineralogist: 39, 1691-1700.

Internet Links for Dickthomssenite

Search Engines:
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  • External Links:
  • Look for Dickthomssenite on Webmineral
  • Look for Dickthomssenite on Athena Mineralogy
  • Look for Dickthomssenite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Dickthomssenite details from Handbook of Mineralogy (PDF)
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  • Localities for Dickthomssenite

    The 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.
    (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.
    USA
     
    • Utah
      • San Juan Co.
        • La Sal District (Paradox Valley District)
          • La Sal Creek Canyon
    Collected by and in the collection of Brent Thorne.
          • Lyon Canyon Creek
    EDX results from Kaygeedee Minerals
        • La Sal Quadrangle
    Canadian Mineralogist (2001) 39, pp. 1691-1700
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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