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About DickthomsseniteHide

Dick W. Thomssen
Mg(V2O6) · 7H2O
Light golden brown
Specific Gravity:
1.96 - 2.09
Crystal System:
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 DickthomsseniteHide

Approval Year:

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

Physical Properties of DickthomsseniteHide

Light golden brown
2½ on Mohs scale
Hardness Data:
1.96 - 2.09 g/cm3 (Measured)    2.04 g/cm3 (Calculated)

Optical Data of DickthomsseniteHide

Biaxial (-)
RI values:
nα = 1.612 nβ = 1.674 nγ = 1.710
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.
Surface Relief:
r < v

Chemical Properties of DickthomsseniteHide

Mg(V2O6) · 7H2O
IMA Formula:
MgV2O6 · 7H2O

Crystallography of DickthomsseniteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 38.954 Å, b = 7.201 Å, c = 16.3465 Å
β = 97.602°
a:b:c = 5.41 : 1 : 2.27
Unit Cell V:
4544 ų
None mentioned

X-Ray Powder DiffractionHide

Powder Diffraction Data:
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)

Type Occurrence of DickthomsseniteHide

Synonyms of DickthomsseniteHide

Other Language Names for DickthomsseniteHide

Simplified Chinese:水镁钒石
Traditional Chinese:水鎂釩石

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Dickthomssenite associated with LasaliteNa2Mg2(V10O28) · 20H2O

Related Minerals - Nickel-Strunz GroupingHide

4.HD.05RossiteCa(VO3)2•4H2OTric. 1 : P1
4.HD.10MetarossiteCa(V2O6) · 2H2OTric. 1 : P1
4.HD.15MuniriteNaVO3 · 1.9H2OMon.
4.HD.30AnsermetiteMn2+(V2O6) · 4H2OMon. 2/m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for DickthomsseniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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, 1691-1700

Internet Links for DickthomsseniteHide

Localities for DickthomsseniteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Colorado
    • Mesa Co.
      • Gateway
Kampf, A.R., Nash, B.P., Marty, J., Hughes, J.M. (2017) Mesaite, CaMn2+5(V2O7)3·12H2O, a new vanadate mineral from the Packrat mine, near Gateway, Mesa County, Colorado, USA. Mineralogical Magazine: 81: 319–327.
  • Utah
    • Grand Co.
      • Thompsons Mining District
        • Yellow Cat Mesa
Kasatkin, A.V., Plášil, J., Marty, J., Belakovskiy, D.I., Lykova, I.S. (2014): Nestolaite, CaSeO3·H2O, a new mineral from the Little Eva mine, Grand County, Utah, USA. Mineralogical Magazine, 78, 497-505.; Kasatkin, A. V., Plasil, J., Pekov, I. V., Belakovskiy, D. I., Nestola, F., Cejka, J., ... & Thorne, B. (2015). Karpenkoite, Co3 (V2O7)(OH) 2· 2H2O, a cobalt analogue of martyite from the Little Eva mine, Grand County, Utah, USA. Journal of Geosciences, 60(4), 251-257.
Chuck Adan specimen. Analyzed by Tony Kampf.
    • San Juan Co.
      • La Sal Mountains
        • La Sal Mining District (Paradox Valley Mining District)
          • La Sal
Hughes, J.M., Wise, W.S., Gunter, M.E., Morton, J.P., Rakovan, J. (2008) Lasalite, Na2Mg2(V10O28)•20H2O, a new decavanadate mineral from the Vanadium Queen mine, La Sal District, Utah: description, atomic arrangement, and relationship to the pascoite group of minerals. The Canadian Mineralogist: 46: 1365-1372.
          • Lion Canyon
EDX results from Kaygeedee Minerals; Kampf A R, Hughes J M, Marty J, Nash B (2012) Postite, Mg(H2O)6Al2(OH)2(H2O)8(V10O28)·13H2O, a new mineral species from the La Sal Mining District, Utah: Crystal structure and descriptive mineralogy. The Canadian Mineralogist 50, 45-53
      • La Sal Quadrangle
Canadian Mineralogist (2001) 39, pp. 1691-1700
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