Pascoite Mineral Data

Pascoite Mineral Data +

General Pascoite Information

Chemical Formula:

Ca3V10O28·17(H2O)

Composition:

Molecular Weight = 1,383.89 gm

Calcium 8.69 % Ca 12.16 % CaO

Vanadium 36.81 % V 65.71 % V₂O₅

Hydrogen 2.48 % H 22.13 % H₂O

Oxygen 52.03 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃V⁵⁺₁₀O₂₈·17(H₂O)

Environment:

Sedimentary U-V deposits.

IMA Status:

Valid Species (Pre-IMA) 1914

Locality:

Minasragra, Pasco Province, Peru. Link to MinDat.org Location Data.

Name Origin:

Named for the locality

Synonym:

ICSD 14309

PDF 21-171

Pascoite Image

Images:

Pascoite

Comments: Deep reddish-orange coatings of pascoite. Individual crystals up to about 0.25 mm.
Location: Slick Rock, Enar Area, San Miguel County, Utah, USA. Scale: 3 x 2 cm.
© John Veevaert

Images:

Pascoite

Comments: Bright orange sugary crusts of pascoite across sandstone matrix.
Location: Black Stone Incline, Thompson dist., Grand Co., Utah, USA. Scale: Picture size 2 cm.
© Tom Loomis / Dakota Matrix

Pascoite Crystallography

Axial Ratios:

a:b:c =1.6575:1:1.0753

Cell Dimensions:

a = 16.834, b = 10.156, c = 10.921, Z = 2; beta = 93.13° V = 1,864.34 Den(Calc)= 2.47

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: C 2

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

By Intensity(I/I_o): 4.67(1), 5.5(1), 5.1(0.8),

Crystal Structure:

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Hughes J M , Schindler M , Francis C A , The Canadian Mineralogist , 43 (2005) p.1379-1386, The C2/m disordered structure of pascoite, Ca3[V10O28]*17H2O:, Bonding between structural units and interstitial complexes, in compounds containing the [V10O28]6- decavanadanate polyanion, Locality: Minasragra, Peru

Physical Properties of Pascoite

Cleavage:

[010] Distinct

Color:

Yellow brown, Yellow orange, Red orange.

Density:

1.87

Diaphaniety:

Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Adamantine

Streak:

yellow

Optical Properties of Pascoite

Gladstone-Dale:

CI meas= -0.328 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3259,KPDmeas= 0.4305,KC= 0.3242

Optical Data:

Biaxial (-), a=1.775, b=1.815, g=1.825, bire=0.0500, 2V(Calc)=52, 2V(Meas)=50. Dispersion r > v very strong.

Pleochroism (x):

pale yellow.

Pleochroism (y):

yellow.

Pleochroism (z):

orange.

Calculated Properties of Pascoite

Electron Density:

r_electron=2.44 gm/cc
note: r_Pascoite=2.47 gm/cc.

Fermion Index

Fermion Index = 0.00129
Boson Index = 0.99871

Photoelectric:

PE_Pascoite= 8.00 barns/electron
U=PE_Pascoite x r_electron= 19.55 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pascoite is Not Radioactive

Pascoite Classification

Dana Class:

47.2.1.1 (47)Vanadium Oxysalts

(47.2)(VmOn)

(47.2.1)Dana Group

47.2.1.1 Pascoite Ca3V10O28·17(H2O) C 2 2

Strunz Class:

IV/G.01-30 IV - Oxides

IV/G - Vanadiumoxides (with V4+/5+), group-vanadates

IV/G.01 - Group vanadate: Huemulite - Sherwoodite series

IV/G.01-10 Huemulite Na4Mg(V10O28)·24(H2O) P1 1

IV/G.01-20 Hummerite KMgV5O14·8(H2O) P1 1

IV/G.01-25 Ronneburgite! K2MnV4O12 P 2₁/n 2/m

IV/G.01-30 Pascoite Ca3V10O28·17(H2O) C 2 2

IV/G.01-40 Sherwoodite Ca9Al2V4V24O80·56(H2O) I 4₁/amd 4/m 2/m 2/m

Other Pascoite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Pascoite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Pascoite

Ca3V10O28·17(H2O)
Dana No: 47.2.1.1 Strunz No: IV/G.01-30
Locality:

Notes: