Antigorite Mineral Data

Antigorite Mineral Data
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General Antigorite Information

Help on Chemical Formula: Chemical Formula: (Mg,Fe++)3Si2O5(OH)4
Help on Composition: Composition: Molecular Weight = 300.77 gm
   Magnesium  18.18 %  Mg   30.15 % MgO
   Iron       13.93 %  Fe   17.92 % FeO
   Silicon    18.68 %  Si   39.95 % SiO2
   Hydrogen    1.34 %  H    11.98 % H2O
   Oxygen     47.88 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg2.25Fe2+0.75(Si2O5)(OH)4
Help on Environment: Environment: Common in regional and contact metamorphosed serpentinites
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1840
Help on Locality: Locality: Antigorio, Italy Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality. From the Latin, serpens - "snake."
Help on Name Pronunciation: Name Pronunciation: Antigorite + Pronunciation Say ANTIGORITE
Help on Synonym: Synonym: Bowenite
  Jenkinsite
  Picrosmine
  Protoantigorite
  Williamsite
 

Antigorite Image

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Antigorite

Comments: Yellowish green, fibrous antigorite.
Location: East Broughon, Quebec, Canada. Scale: 22x10 cm.
© Dave Barthelmy
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Antigorite   Chromite

Comments: Chromite veins in yellow to green antigorite with picrolite, chromian antigorite and dolomite (polished section).
Location: Wood's Mine, near 'Texas', Little Britain Township, Lancaster County, Pennsylvania, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Antigorite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =4.7013:1:0.7844
Help on Cell Dimensions: Cell Dimensions: a = 43.53, b = 9.259, c = 7.263, Z = 16; beta = 91.633° V = 2,926.12 Den(Calc)= 2.73
Help on Crystal System: Crystal System: Monoclinic - DomaticH-M Symbol (m) Space Group: Cm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.53(1), 7.29(1), 3.61(0.8),
Click Here for Large Antigorite Structure Window Crystal Structure:

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Capitani G , Mellini M , American Mineralogist , 89 (2004) p.147-158, The modulated crystal structure of antigorite: The m = 17 polysome

View Additional jPOWD Structure files for Antigorite
[1] [2]
 

Physical Properties of Antigorite

Help on Cleavage: Cleavage: {001} Good
Help on Color: Color: Green, Gray, Bluish gray, Brown, Black.
Help on Density: Density: 2.5 - 2.6, Average = 2.54
Help on Diaphaneity: Diaphaneity: Translucent to Subopaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Scaly - Morphology like fish scales.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: greenish white
 

Optical Properties of Antigorite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2068,KPDmeas= 0.2214,KC= 0.2178
Ncalc = 1.54 - 1.59
Help on Optical Data: Optical Data: Biaxial (-), a=1.555-1.567, b=1.56-1.573, g=1.56-1.573, bire=0.0050-0.0060, 2V(Calc)=0, 2V(Meas)=20-50. Dispersion weak, r > v.
Help on Pleochroism (x): Pleochroism (x): pale greenish yellow.
Help on Pleochroism (y): Pleochroism (y): light green.
Help on Pleochroism (z): Pleochroism (z): light green.
 

Calculated Properties of Antigorite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.55 gm/cc
note: Specific Gravity of Antigorite =2.55 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEAntigorite = 5.20 barns/electron
U=PEAntigorite x rElectron Density= 13.27 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Antigorite is Not Radioactive
 

Antigorite Classification
Help on Dana Class: Dana Class: 71.01.02a.01 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.01)with 1:1 layers
  (71.01.02a)Serpentine group
 
71.01.02a.01 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m
Help on Strunz Class: Strunz Class: 09.ED.15 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.ED -Phyllosilicates with kaolinite layers
 
09.ED.15 Clinochrysotile? Mg3Si2O5(OH)4 Cc, C 2/m Mono
 
09.ED.15 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m
 
09.ED.15 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2
 
09.ED.15 Amesite Mg2Al(SiAl)O5(OH)4 C1 1
 
09.ED.15 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m
 
09.ED.15 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono
 
09.ED.15 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m
 
09.ED.15 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 31m 3m
 
09.ED.15 Chrysotile Mg3Si2O5(OH)4 A2/m 2/m
 
09.ED.15 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2
 
09.ED.15 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono
 
09.ED.15 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 63 6
 
09.ED.15 Maufite? (Mg,Ni)Al4Si3O13•4(H2O)(?) Mono ? Mono
 
09.ED.15 Lizardite Mg3Si2O5(OH)4 P1 1
 
09.ED.15 Orthochrysotile? Mg3Si2O5(OH)4 Unk Ortho
 
09.ED.15 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1
 
09.ED.15 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m
 
09.ED.15 Parachrysotile? Mg3Si2O5(OH)4 Unk Ortho
 

Other Antigorite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Antigorite :
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 - HyperPhysics
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Antigorite

(Mg,Fe++)3Si2O5(OH)4
Dana No: 71.01.02a.01 Strunz No: 09.ED.15
Locality:

 

Notes: