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Dickthomssenite

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Firefly–Pigmay Mine, La Sal Quadrangle, San Juan Co., Utah, USA
© Brent Thorne

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Formula:
Mg(V
 
2
O
 
6
) · 7H
 
2
O
System:MonoclinicColour:Light golden brown
Hardness:2½
Name:
For Richard ("Dick") W. Thomssen (b.1933), 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):2½
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 {B1 1 2/b} {C2/c} {C1 2/c 1}
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
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
Spanish:Dickthomssenita

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

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  • 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.
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    (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 Quadrangle
    		Canadian Mineralogist (2001) 39, pp. 1691-1700
        • Paradox Valley
          • Paradox Valley District
    		EDX results from Kaygeedee Minerals
            • La Sal Creek Canyon
    		Collected by and in the collection of Brent Thorne.
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