Pentagonite  Mineral Data

Pentagonite Mineral Data

Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images Share
      News Help About


General Pentagonite Information

Help on Chemical  Formula: Chemical Formula: Ca(VO)Si4O10•4(H2O)
Help on Composition: Composition: Molecular Weight = 451.42 gm
   Calcium    8.88 %  Ca   12.42 % CaO
   Vanadium  11.28 %  V    20.15 % V2O5
   Silicon   24.89 %  Si   53.24 % SiO2
   Hydrogen   1.79 %  H    15.96 % H2O
   Oxygen    53.16 %  O
            ______        ______ 
            100.00 %      101.77 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaV5+Si4O11•4(H2O)
Help on Environment: Environment: Alteration product occurring in basalts and tuffs.
Help on IMA Status: IMA Status: Approved IMA 1973
Help on Locality: Locality: Lake Owyhee State Park, Malheur County, and Goble, Columbia County, Oregon, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek, penta, "five" and angle in allusion to the fiveling twins common in this species.
Help on Name Pronunciation: Name Pronunciation: Pentagonite + Pronunciation Say PENTAGONITE
Help on Synonym: Synonym: ICSD 10262
  PDF 25-181
 

Pentagonite Image

Click Here for Larger Pentagonite Image in a New Browser Window Images:
Click Here for Larger Pentagonite Image

Pentagonite

Comments: Blue, crystalline aggregate of pentagonite on zeolite.
Location: Wagholi quarries, Poona, India. Scale: Grain size 1.2 cm.
© Tom Loomis / Dakota Matrix

Pentagonite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7356:1:0.635
Help on Cell Dimensions: Cell Dimensions: a = 10.298, b = 13.999, c = 8.89, Z = 4; V = 1,281.60 Den(Calc)= 2.34
Help on Crystal System: Crystal System: Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Ccm21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.755(1), 3.92(1), 6.071(1),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 2 0 1) ( 1 1 0) ( 0 0 1)

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Click Here for Large Pentagonite Structure Window 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


Evans H T , American Mineralogist , 58 (1973) p.412-424, The crystal structures of cavansite and pentagonite

 

Physical Properties of Pentagonite

Help on Cleavage: Cleavage: {010} Good
Help on Color: Color: Greenish blue.
Help on Density: Density: 2.33
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Habit: Habit: Twinning Common - Crystals are usually twinned.
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: bluish white
 

Optical Properties of Pentagonite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.102 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.106 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2321,KPDmeas= 0.2331,KC= 0.2596
Ncalc = 1.6 - 1.61
Help on Optical Data: Optical Data: Biaxial (-), a=1.533-1.54, b=1.544-1.545, g=1.547-1.55, bire=0.0100-0.0140, 2V(Calc)=54-88, 2V(Meas)=50. Dispersion r < v extreme.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): blue.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Pentagonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.34 gm/cc
note: Specific Gravity of Pentagonite =2.33 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEPentagonite = 4.15 barns/electron
U=PEPentagonite x rElectron Density= 9.71 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pentagonite is Not Radioactive
 

Pentagonite Classification

Help on  Dana Class: Dana Class: 74.03.07.02 (74)Phyllosilicate Modulated Layers
  (74.03)with joined strips
  (74.03.07)V phyllosilicates
 
74.03.07.01 Cavansite Ca(VO)Si4O10•4(H2O) Pcmn 2/m 2/m 2/m
 
74.03.07.02 Pentagonite Ca(VO)Si4O10•4(H2O) Ccm21 mm2
Help on  Strunz Class: Strunz Class: 09.EA.55 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EA -Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
 
09.EA.55 Pentagonite Ca(VO)Si4O10•4(H2O) Ccm21 mm2
 

Other Pentagonite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Pentagonite :
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 Pentagonite using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Pentagonite :

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

Ask about Pentagonite 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 Espaņol

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

Pentagonite

Ca(VO)Si4O10•4(H2O)
Dana No: 74.03.07.02 Strunz No: 09.EA.55
Locality:

 

Notes: