Vermiculite  Mineral Data

Vermiculite Mineral Data

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


General Vermiculite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Fe++,Al)3(Al,Si)4O10(OH)2•4(H2O)
Help on Composition: Composition: Molecular Weight = 504.19 gm
   Magnesium   8.68 %  Mg   14.39 % MgO
   Aluminum   23.01 %  Al   43.48 % Al2O3
   Iron        9.97 %  Fe   12.82 % FeO
   Silicon     5.57 %  Si   11.92 % SiO2
   Hydrogen    2.00 %  H    17.87 % H2O
   Oxygen     50.77 %  O
             ______        ______ 
             100.00 %      100.48 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg1.8Fe2+0.9Al4.3SiO10(OH)2•4(H2O)
Help on Environment: Environment: Appears to have been formed by weathering or hydrothermal alteration of iron-bearing phlogopite an annite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1824
Help on Locality: Locality: Millbury, Worchaster County, MA, USA Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Latin vermiculus, "little worm."
Help on Name Pronunciation: Name Pronunciation: Vermiculite + Pronunciation Say VERMICULITE
Help on Synonym: Synonym: Batavite - Fe-poor variety of vermiculite
  Hydrobiotite
  Hydromica
  Jeffersinite
 

Vermiculite Image

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

Vermiculite

Comments: Micaceous vermiculite book.
Location: Brinton's Quarry, near West Chester, Chester County, Pennsylvania, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Vermiculite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5698:1:1.6218
Help on Cell Dimensions: Cell Dimensions: a = 5.26, b = 9.23, c = 14.97, Z = 2; beta = 96.82° V = 721.65 Den(Calc)= 2.32
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m
Click Here for Large Vermiculite 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


Gruner J W , American Mineralogist , 19 (1934) p.557-575, The structures of vermiculites and their collapse by dehydration

View Additional jPOWD Structure files for Vermiculite
[1] [2] [3] [4] [5]
 

Physical Properties of Vermiculite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Colorless, Green, Gray white, Yellow brown.
Help on Density: Density: 2.3 - 2.7, Average = 2.5
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Lamellar - Thin laminae producing a lamellar structure.
Help on Habit: Habit: Scaly - Morphology like fish scales.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: greenish white
 

Optical Properties of Vermiculite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2398,KPDmeas= 0.2225,KC= 0.2284
Ncalc = 1.53 - 1.62
Help on Optical Data: Optical Data: Biaxial (-), a=1.525-1.561, b=1.545-1.581, g=1.545-1.581, bire=0.0200, 2V(Calc)=0, 2V(Meas)=0-8. Dispersion weak, r > v.
Help on Pleochroism (x): Pleochroism (x): colorless or pale green.
Help on Pleochroism (y): Pleochroism (y): pale brown, yellowish green, or brownish green.
Help on Pleochroism (z): Pleochroism (z): pale brown, yellowish green, or brownish green.
 

Calculated Properties of Vermiculite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.51 gm/cc
note: Specific Gravity of Vermiculite =2.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEVermiculite = 4.01 barns/electron
U=PEVermiculite x rElectron Density= 10.06 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Vermiculite is Not Radioactive
 

Vermiculite Classification

Help on  Dana Class: Dana Class: 71.02.02d.03 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.02)with 2:1 Layers
  (71.02.02d)Mica Group (Hydromica subgroup)
 
71.02.02d.01 Hydrobiotite [K(Mg,Fe)3(Al,Fe)Si3O10(OH,F)2]•[(Mg,Fe,Al)3(Si,Al)4O10(OH)2•4(H2O)] C 2/m 2/m
 
71.02.02d.02 Illite* (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,(H2O)] C 2/m 2/m
 
71.02.02d.03 Vermiculite (Mg,Fe,Al)3(Al,Si)4O10(OH)2•4(H2O) C 2/m 2/m
 
71.02.02d.04 Brammallite* (Na,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,(H2O)] C 2/c 2/m
Help on  Strunz Class: Strunz Class: 09.EC.50 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
 
09.EC.50 Vermiculite (Mg,Fe,Al)3(Al,Si)4O10(OH)2•4(H2O) C 2/m 2/m
 

Other Vermiculite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Vermiculite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - Scandinavian mineral gallery
19 - WWW-MINCRYST

Search for Vermiculite using:

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

Visit our Advertisers for Vermiculite :

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

Ask about Vermiculite 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 Vermiculite Specimen Label here :

Vermiculite

(Mg,Fe++,Al)3(Al,Si)4O10(OH)2•4(H2O)
Dana No: 71.02.02d.03 Strunz No: 09.EC.50
Locality:

 

Notes: