Mineralogy Database

Pascoite Mineral Data

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General Pascoite Information

Help on Chemical  Formula: Chemical Formula: Ca3V10O28•17(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca3V5+10O28•17(H2O)
Help on Environment: Environment: Sedimentary U-V deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1914
Help on Locality: Locality: Minasragra, Pasco Province, Peru. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality
Help on Name Pronunciation: Name Pronunciation: Pascoite Say PASCOITE
Help on Synonym: Synonym: ICSD 14309
  PDF 21-171

Pascoite Image

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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

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.9314:1:1.0759
Help on Cell Dimensions: Cell Dimensions: a = 19.5859, b = 10.1405, c = 10.911, Z = 2; beta = 120.815° V = 1,861.11 Den(Calc)= 2.47
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.67(1), 5.5(1), 5.1(0.8),

Physical Properties of Pascoite

Help on Cleavage: Cleavage: {010} Distinct
Help on Color: Color: Yellow brown, Yellow orange, Red orange.
Help on Density: Density: 1.87
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous - Adamantine
Help on Streak: Streak: yellow

Optical Properties of Pascoite

Help on Gladstone-Dale: 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
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): pale yellow.
Help on Pleochroism (y): Pleochroism (y): yellow.
Help on Pleochroism (z): Pleochroism (z): orange.

Calculated Properties of Pascoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.44 gm/cc
note: Specific Gravity of Pascoite =2.47 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.001290983
Boson Index = 0.998709017
Help on Photoelectric: Photoelectric: PEPascoite = 8.00 barns/electron
U=PEPascoite x rElectron Density= 19.55 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pascoite is Not Radioactive

Pascoite Classification

Help on  Dana Class: Dana Class: (47)Vanadium Oxysalts
  (47.02.01)Pascoite Group Pascoite Ca3V10O28•17(H2O) C 2/m 2/m Magnesiopascoite! Ca2Mg[V10O28]•16H2O C 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8, AmMin, v91, p715) OPTIC PROP.(Dana8)
Help on See Also: 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

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Dana No: Strunz No: 04.HC.05





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