Pascoite Mineral Data

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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

Name Pronunciation:

Pascoite

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 =1.9314:1:1.0759

Cell Dimensions:

a = 19.5859, b = 10.1405, c = 10.911, Z = 2; beta = 120.815° V = 1,861.11 Den(Calc)= 2.47

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): 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

Diaphaneity:

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
Ncalc = 1.61 - 1.8

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:

Bulk Density (Electron Density)=2.44 gm/cc
note: Specific Gravity of Pascoite =2.47 gm/cc.

Fermion Index:

Fermion Index = 0.001290983
Boson Index = 0.998709017

Photoelectric:

PE_Pascoite= 8.00 barns/electron
U=PE_Pascoite x rElectron Density= 19.55 barns/cc.

Radioactivity:

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

Pascoite Classification

Dana Class:

47.02.01.01 (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 Pascoite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8, AmMin, v91, p715) OPTIC PROP.(Dana8)

See Also:

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

Search for Pascoite using:

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Ask about Pascoite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Pascoite Specimen Label here :

Pascoite

Ca3V10O28•17(H2O)
Dana No: 47.02.01.01 Strunz No: 04.HC.05
Locality:

Notes: