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

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Pascoite :

A Bijoux Google Search for Pascoite
Adam's Minerals Google Search for Pascoite
Cape Minerals Google Search for Pascoite
Dakota Matrix Minerals Google Search for Pascoite
Excalibur Mineral Corp. Google Search for Pascoite
Exceptional Minerals Google Search for Pascoite
John Betts Fine Minerals Search for Pascoite
McDougall Minerals Google Search for Pascoite
Mineral News Website Link
Rock and Mineral Shows Google Search for Pascoite
Weinrich Minerals, Inc. Google Search for Pascoite

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: