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Dickthomssenite

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Dick W. Thomssen
Formula:
Mg(V2O6) · 7H2O
System:
Monoclinic
Colour:
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

Approved 2000
4.HD.25

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
D : Inovanadates
mindat.org URL:
http://www.mindat.org/min-11216.html
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First Recorded Occurrence of Dickthomssenite

Geological Setting of First Recorded Material:
Coating on sandstone.

Physical Properties of Dickthomssenite

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

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 Data:
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°
Max Birefringence:
δ = 0.098
Image 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(V2O6) · 7H2O
Essential elements:
All elements listed in formula:
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:
(Mg0.95Fe0.02)Σ0.97(V2O6) · 7.00H2O

Relationship of Dickthomssenite to other Species

4.HD.05RossiteCa(V2O6) · 4H2O
4.HD.10MetarossiteCa(V2O6) · 2H2O
4.HD.15MuniriteNaVO3 · 1.9H2O
4.HD.20MetamuniriteNaVO3
4.HD.30AnsermetiteMn2+(V2O6) · 4H2O

Other Names for Dickthomssenite

Name in Other Languages:
Simplified Chinese:水镁钒石
Traditional Chinese:水鎂釩石

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.

References for Dickthomssenite

Reference List:
Canadian Mineralogist: 39, 1691-1700.

Internet Links for Dickthomssenite

Localities for Dickthomssenite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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
Mineral and/or Locality  
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