Antigorite Mineral Data

Antigorite Mineral Data +

[On-Line Catalogue] [On-Line Auctions] [eBay] [Contact Us] [Policies]
We specialize in fine European and Asian Mineral Specimens
Heliodor is based in Prague, Czech Republic

General Antigorite Information

Chemical Formula:

(Mg,Fe++)3Si2O5(OH)4

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

Empirical Formula:

Mg_2.25Fe²⁺_0.75(Si₂O₅)(OH)₄

Environment:

Common in regional and contact metamorphosed serpentinites

IMA Status:

Valid Species (Pre-IMA) 1840

Locality:

Antigorio, Italy Link to MinDat.org Location Data.

Name Origin:

Named after its locality. From the Latin, serpens - "snake."

Synonym:

Bowenite

Jenkinsite

Picrolite

Picrosmine

Williamsite

Antigorite Image

Images:

Antigorite

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

Images:

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

Axial Ratios:

a:b:c =4.7013:1:0.7844

Cell Dimensions:

a = 43.53, b = 9.259, c = 7.263, Z = 16; beta = 91.633° V = 2,926.12 Den(Calc)= 2.73

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Cm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.53(1), 7.29(1), 3.61(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

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

Cleavage:

[001] Good

Color:

Green, Gray, Bluish gray, Brown, Black.

Density:

2.5 - 2.6, Average = 2.54

Diaphaniety:

Translucent to Subopaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Scaly - Morphology like fish scales.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Vitreous - Greasy

Streak:

greenish white

Optical Properties of Antigorite

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

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.

Pleochroism (x):

pale greenish yellow.

Pleochroism (y):

light green.

Pleochroism (z):

light green.

Calculated Properties of Antigorite

Electron Density:

r_electron=2.55 gm/cc
note: r_Antigorite=2.55 gm/cc.

Fermion Index

Fermion Index = 0.03008
Boson Index = 0.96992

Photoelectric:

PE_Antigorite= 5.20 barns/electron
U=PE_Antigorite x r_electron= 13.27 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Antigorite is Not Radioactive

Antigorite Classification

Dana Class:

71.1.2a.1 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.1)with 1:1 layers

(71.1.2a)Serpentine group

71.1.2a.1 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m

Strunz Class:

VIII/H.27-10 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups

VIII/H.27 - Serpentine group

VIII/H.27-10 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m

VIII/H.27-20 Lizardite Mg3Si2O5(OH)4 P1 1

VIII/H.27-30 Clinochrysotile Mg3Si2O5(OH)4 Cc, C 2/m Mono

VIII/H.27-40 Orthochrysotile Mg3Si2O5(OH)4 Unk Ortho

VIII/H.27-50 Parachrysotile Mg3Si2O5(OH)4 Unk Ortho

VIII/H.27-55 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono

VIII/H.27-60 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono

VIII/H.27-70 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m

VIII/H.27-80 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m

VIII/H.27-90 Zinalsite Zn2AlSi2O5(OH)4·2(H2O)(?) Mono

VIII/H.27-95 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m

VIII/H.27-100 Amesite Mg2Al(SiAl)O5(OH)4 C1 1

VIII/H.27-110 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 6₃ 6

VIII/H.27-120 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3₁m 3m

VIII/H.27-140 Karpinskite (Mg,Ni)2Si2O5(OH)2(?) Unk Mono

VIII/H.27-150 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2

VIII/H.27-160 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m

VIII/H.27-170 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2

VIII/H.27-180 Maufite (Mg,Ni)Al4Si3O13·4(H2O)(?) Mono ? Mono

VIII/H.27-190 Carlosturanite (Mg,Fe,Ti,Mn)21(Si,Al)12O28(OH)34 Cm m

Other Antigorite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - HyperPhysics
10 - MinDAT
11 - MinMax(Deutsch)
12 - MinMax(English)
13 - Mineral and Gemstone Kingdom
14 - Mineralienatlas (Deutsch)
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

Search for Antigorite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Antigorite :

AA Mineral Specimens

B & L Fine Minerals

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

MineralsWeb Fine Minerals

The GeoZone

Wrights Rock Shop

Translate Antigorite Mineral Data :

Ask about Antigorite 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 Antigorite Specimen Label here :

Antigorite

(Mg,Fe++)3Si2O5(OH)4
Dana No: 71.1.2a.1 Strunz No: VIII/H.27-10
Locality:

Notes: