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Dickthomssenite Mineral Data

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General Dickthomssenite Information

Help on Chemical  Formula: Chemical Formula: Mg(V+++++2O6)•7(H2O)
Help on Composition: Composition: Molecular Weight = 348.29 gm
   Magnesium   6.98 %  Mg   11.57 % MgO
   Vanadium   29.25 %  V    52.22 % V2O5
   Hydrogen    4.05 %  H    36.21 % H2O
   Oxygen     59.72 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: MgV5+2O6•7(H2O)
Help on Environment: Environment: Coatings on sandstone associated with U-V minerals and organic materials. Structural relationships to munirite and rossite
Help on IMA Status: IMA Status: Approved IMA 2000 (Dana # Added)
Help on Locality: Locality: Firefly-Pigmay uranium-vanadium mine, San Juan County, Utah, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Richard W. Thomssen (1933-), consulting geologist from Dayton, Nevada, USA.
Help on Synonym: Synonym: IMA2000-047

Dickthomssenite Image

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Comments: Yellowish white, prismatic crystals of dickthomssenite on matrix.
Location: Firefly-Pigmay Mine, La Sal Quadrangle, San Juan Co., Utah, USA. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

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Comments: Yellowish prismatic-looking, radial aggregates of dickthomssenite forming "balls" to 2mm on matrix.
Location: Firefly-Pigmy mine, San Juan Co., Utah, USA. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

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Comments: White, translucent balls of fiberous aggregates of dickthomssenite on matrix.
Location: Vanadium Queen Mine, Paradox District, La Sal Area, San Juan County, Utah, USA. Scale: See Image.
© Jeff Weissman / Photographic Guide to Mineral Species

Dickthomssenite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =5.4095:1:2.27
Help on Cell Dimensions: Cell Dimensions: a = 38.954, b = 7.201, c = 16.3465, Z = 16; beta = 97.602° V = 4,545.02 Den(Calc)= 2.04
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.843(1)(402), 9.704(1)(400), 3.139(0.9)(12.0.2),2.92(0.6), 8.12(0.6), 2.707(0.5), 4.061(0.5),

Physical Properties of Dickthomssenite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Light golden brown.
Help on Density: Density: 1.96 - 2.09, Average = 2.02
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Hackly - Jagged, torn surfaces, (e.g. fractured metals).
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Dickthomssenite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3263,KPDmeas= 0.3287,KC= 0.3238
Ncalc = 1.63 - 1.68
Help on Optical Data: Optical Data: Biaxial (-), a=1.6124, b=1.674, g=1.7104, bire=0.0980, 2V(Calc)=72, 2V(Meas)=74. Dispersion r < v.

Calculated Properties of Dickthomssenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.06 gm/cc
note: Specific Gravity of Dickthomssenite =2.04 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0080023818
Boson Index = 0.9919976182
Help on Photoelectric: Photoelectric: PEDickthomssenite = 5.61 barns/electron
U=PEDickthomssenite x rElectron Density= 11.57 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Dickthomssenite is Not Radioactive

Dickthomssenite Classification

Help on  Dana Class: Dana Class: (47)Vanadium Oxysalts
  (47.01)(Normal VO3)
  (47.01.04)Dana Group Dickthomssenite! Mg(V2O6)•7(H2O) C 2/c 2/m
Help on  Strunz Class: Strunz Class: 04.HD.25 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.H - V[5,6] Vanadates
  04.HD -Inovanadates
04.HD.25 Dickthomssenite! Mg(V2O6)•7(H2O) C 2/c 2/m

Other Dickthomssenite Information

Help on References: References: NAME( MinRec, v 33, n 4, p 351) PHYS. PROP.(MinRec, v 33, n 4, p 351) OPTIC PROP.(MinRec, v 33, n 4, p 351)
Help on See Also: See Also: Links to other databases for Dickthomssenite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 04.HD.25





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