Dickthomssenite Mineral Data

General Dickthomssenite Information

Chemical Formula:

Mg(V+++++2O6)•7(H2O)

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

Empirical Formula:

MgV⁵⁺₂O₆•7(H₂O)

Environment:

Coatings on sandstone associated with U-V minerals and organic materials. Structural relationships to munirite and rossite

IMA Status:

Approved IMA 2000 (Dana # Added)

Locality:

Firefly-Pigmay uranium-vanadium mine, San Juan County, Utah, USA. Link to MinDat.org Location Data.

Name Origin:

Named after Richard W. Thomssen (1933-), consulting geologist from Dayton, Nevada, USA.

Synonym:

IMA2000-047

Dickthomssenite Image

Images:

Dickthomssenite

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

Images:

Dickthomssenite

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

Images:

Dickthomssenite

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

Axial Ratios:

a:b:c =5.4095:1:2.27

Cell Dimensions:

a = 38.954, b = 7.201, c = 16.3465, Z = 16; beta = 97.602° V = 4,545.02 Den(Calc)= 2.04

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/I_o): 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

Cleavage:

{100} Perfect

Color:

Light golden brown.

Density:

1.96 - 2.09, Average = 2.02

Diaphaneity:

Translucent

Fracture:

Hackly - Jagged, torn surfaces, (e.g. fractured metals).

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Dickthomssenite

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

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

Electron Density:

Bulk Density (Electron Density)=2.06 gm/cc
note: Specific Gravity of Dickthomssenite =2.04 gm/cc.

Fermion Index:

Fermion Index = 0.0080023818
Boson Index = 0.9919976182

Photoelectric:

PE_{Dickthomssenite}= 5.61 barns/electron
U=PE_{Dickthomssenite} x rElectron Density= 11.57 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Dickthomssenite is Not Radioactive

Dickthomssenite Classification

Dana Class:

47.01.04.01 (47)Vanadium Oxysalts

(47.01)(Normal VO3)

(47.01.04)Dana Group

47.01.04.01 Dickthomssenite! Mg(V2O6)•7(H2O) C 2/c 2/m

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

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)

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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Dickthomssenite

Mg(V+++++2O6)•7(H2O)
Dana No: 47.01.04.01 Strunz No: 04.HD.25
Locality:

Notes:

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