Magnesiopascoite Mineral Data

General Magnesiopascoite Information

Chemical Formula:

Ca2Mg[V10O28]•16H2O

Composition:

Molecular Weight = 1,341.11 gm

Calcium 5.29 % Ca 7.40 % CaO

Magnesium 1.54 % Mg 2.55 % MgO

Vanadium 37.98 % V 67.81 % V₂O₅

Zinc 0.20 % Zn 0.24 % ZnO

Cobalt 0.04 % Co 0.06 % CoO

Hydrogen 2.45 % H 21.94 % H₂O

Oxygen 52.49 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca_1.77Mg_0.85Zn_0.04Co_0.01(H₂O)_15.34(H₃O)_0.66V⁵⁺₁₀O₂₈

Environment:

Formed from post-mining leaching and oxidation of V-U oxide-replacement assemblage developed at the expense of organic material. Pascoite group.

IMA Status:

Approved IMA 2007 (Dana # Added)

Locality:

Blue Cap mine, about 15 km east of La Sal, San Juan Co., Utah, USA Link to MinDat.org Location Data.

Name Origin:

Named as the Mg analogue of pascoite

Synonym:

IMA2007-025

Magnesiopascoite Image

Images:

Magnesiopascoite

Comments: Intergrowth of orange magnesiopascoite crystals on V-U oxide replacement of organic material. CanMin v46:.
Location: Blue Cap mine, near La Sal, San Juan County, Utah, U.S.A.. Scale: Crystal size 2.2mm across.
© Canadian Mineralogist

Magnesiopascoite Crystallography

Axial Ratios:

a:b:c =1.9973:1:1.0784

Cell Dimensions:

a = 19.8442, b = 9.9353, c = 10.7149, Z = 2; beta = 120.305° V = 1,823.86 Den(Calc)= 2.44

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 8.571(1), 7.27(0.4), 8.872(0.3),2.137(0.2), 9.242(0.2), 4.355(0.15), 4.59(0.15), 5.477(0.15),

Crystal Structure:

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Kampf A R , Steele I M , The Canadian Mineralogist , 46 (2008) p.679-686, Magnesiopascoite, a new member of the pascoite group: description and crystal structure, Locality: Blue Cap mine, San Juan County, Utah, USA

Physical Properties of Magnesiopascoite

Cleavage:

{001} Perfect

Color:

Bright orange.

Density:

2.43

Diaphaneity:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Blocky - Crystal shape tends to be equant (e.g. feldspars).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

2.5 - Finger Nail

Luster:

Adamantine

Streak:

yellow

Optical Properties of Magnesiopascoite

Gladstone-Dale:

CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3249,KPDmeas= 0.3262,KC= 0.3263
Ncalc = 1.79 - 1.8

Optical Data:

Biaxial (-), a=1.769, b=1.802, g=1.807, bire=0.0380, 2V(Calc)=40, 2V(Meas)=45. Dispersion r < v crossed.

Calculated Properties of Magnesiopascoite

Electron Density:

Bulk Density (Electron Density)=2.40 gm/cc
note: Specific Gravity of Magnesiopascoite =2.43 gm/cc.

Fermion Index:

Fermion Index = 0.0028970877
Boson Index = 0.9971029123

Photoelectric:

PE_{Magnesiopascoite}= 7.96 barns/electron
U=PE_{Magnesiopascoite} x rElectron Density= 19.08 barns/cc.

Radioactivity:

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

Magnesiopascoite Classification

Dana Class:

47.02.01.02 (47)Vanadium Oxysalts

(47.02)(VmOn)

(47.02.01)Pascoite Group

47.02.01.01 Pascoite Ca3V10O28•17(H2O) C 2/m 2/m

47.02.01.02 Magnesiopascoite! Ca2Mg[V10O28]•16H2O C 2/m 2/m

Strunz Class:

04.HC.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.H - V[5,6] Vanadates

04.HC -[6]-Sorovanadates

04.HC.05 Pascoite Ca3V10O28•17(H2O) C 2/m 2/m

04.HC.05 Magnesiopascoite! Ca2Mg[V10O28]•16H2O C 2/m 2/m

04.HC.05 Lasalite! Na2Mg2(V10O28)•20H2O C 2/c 2/m

Other Magnesiopascoite Information

References:

NAME( CanMin, v46:679) PHYS. PROP.(CanMin, v46:679) OPTIC PROP.(CanMin, v46:679)

See Also:

Links to other databases for Magnesiopascoite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Ask about Magnesiopascoite here :
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Print or Cut-and-Paste your Magnesiopascoite Specimen Label here :

Magnesiopascoite

Ca2Mg[V10O28]•16H2O
Dana No: 47.02.01.02 Strunz No: 04.HC.05
Locality:

Notes: