Anthophyllite Mineral Data

General Anthophyllite Information

Chemical Formula:

[ ]Mg7Si8O22(OH)2

Composition:

Molecular Weight = 780.82 gm

Magnesium 21.79 % Mg 36.13 % MgO

Silicon 28.78 % Si 61.56 % SiO₂

Hydrogen 0.26 % H 2.31 % H₂O

Oxygen 49.18 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₇(Si₈O₂₂)(OH)₂

Environment:

Metamorphic rocks.

IMA Status:

Valid Species (Pre-IMA) 1861

Locality:

Bodenmais, Germany. Montana, USA. Link to MinDat.org Location Data.

Name Origin:

From the Latin anthophyllum - "clove" in allusion to the color.

Name Pronunciation:

Anthophyllite + Pronunciation

Synonym:

ICSD 40294

PDF 42-544

Anthophyllite Image

Images:

Anthophyllite Biotite

Comments: Fibrous mass of anthophyllite as a shell around biotite.
Location: Hermanov, Severocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Magnesioanthophyllite Anthophyllite

Comments: Schistose amphibolite rock composed primarily of anthophyllite (magnesioanthophyllite is now considered to be anthophyllite).
Location: Winchester, Riverside County, California, USA. Scale: See Image.
© Rruff Database

Anthophyllite Crystallography

Axial Ratios:

a:b:c =1.0292:1:0.2929

Cell Dimensions:

a = 18.554, b = 18.026, c = 5.28, Z = 5; V = 1,765.92 Den(Calc)= 3.67

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma

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

By Intensity(I/I_o): 3.05(1), 3.24(0.6), 8.26(0.55),

Physical Properties of Anthophyllite

Cleavage:

{110} Perfect, {???} Distinct, {???} Distinct

Color:

White, Greenish gray, Green, Clove brown, Brownish green.

Density:

2.85 - 3.57, Average = 3.21

Diaphaneity:

Transparent to translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5-6 - Between Apatite and Orthoclase

Luminescence:

Fluorescent, Short UV=red, Long UV=red.

Luster:

Vitreous - Pearly

Streak:

gray

Optical Properties of Anthophyllite

Gladstone-Dale:

CI meas= 0.034 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.155 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1759,KPDmeas= 0.2011,KC= 0.2082
Ncalc = 1.59 - 1.76

Optical Data:

Biaxial (+), a=1.598-1.674, b=1.605-1.685, g=1.615-1.697, bire=0.0170-0.0230, 2V(Calc)=82-90, 2V(Meas)=57-90. Dispersion r > v or r < v.

Pleochroism (x):

pale green, pale tan brown, clove brown, or greenish yellow.

Pleochroism (y):

brownish green, pale tan brown, clove brown, or greenish yellow.

Calculated Properties of Anthophyllite

Electron Density:

Bulk Density (Electron Density)=3.21 gm/cc
note: Specific Gravity of Anthophyllite =3.21 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Anthophyllite}= 1.59 barns/electron
U=PE_{Anthophyllite} x rElectron Density= 5.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Anthophyllite is Not Radioactive

Anthophyllite Classification

Dana Class:

66.01.02.02 (66)Inosilicate Double-Width Unbranched Chains, W=2

(66.01)with P=2 amphibole configuration

(66.01.02)Dana Group

66.01.02.01 Magnesioanthophyllite? (Mg,Fe)7Si8O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.02 Anthophyllite []Mg7Si8O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.02a Protoanthophyllite! (Mg,Fe)7Si8O22(OH)2 Pnmn 2/m 2/m 2/m

66.01.02.03 Ferro-anthophyllite []Fe7Si8O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.03a Protoferro-anthophyllite! (Fe,Mn)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

66.01.02.03b Protomangano-ferro-anthophyllite! (Mn,Fe)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

66.01.02.04 Sodicanthophyllite NaMg7Si8O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.04a Sodic-ferro-anthophyllite! NaFe7Si8O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.05 Magnesiogedrite? (Mg,Fe)5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.06 Gedrite []Mg5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.07 Ferrogedrite []Fe5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.07a Sodic-ferrogedrite! NaFe6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.08 Sodicgedrite NaMg6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.09 Magnesioholmquistite Li2(Mg,Fe)3Al2Si8O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.10 Holmquistite [](Li2Mg3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m

66.01.02.11 Ferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m

Strunz Class:

09.DE.05 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DE -Inosilicates with 2-periodic double chains, Si4O11; amphibole family

09.DE.05 Ferro-anthophyllite []Fe7Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Anthophyllite []Mg7Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Ferrogedrite []Fe5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Gedrite []Mg5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Ferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Holmquistite [](Li2Mg3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Cummingtonite []Mg7Si8O22(OH)2 C 2/m 2/m

09.DE.05 Clinoferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 C 2/m 2/m

09.DE.05 Grunerite []Fe7Si8O22(OH)2 C 2/m 2/m

09.DE.05 Magnesiocummingtonite (Mg,Fe)7Si8O22(OH)2 C 2/m 2/m

09.DE.05 Manganogrunerite []Mn2Fe5Si8O22(OH) C 2/m 2/m

09.DE.05 Magnesioanthophyllite? (Mg,Fe)7Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Protomangano-ferro-anthophyllite! (Mn,Fe)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

09.DE.05 Sodicgedrite NaMg6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Sodic-ferro-anthophyllite! NaFe7Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Sodic-ferrogedrite! NaFe6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Sodicanthophyllite NaMg7Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Permanganogrunerite! []Mn4(Fe)3(Si8O22)(OH)2 C 2/m 2/m

09.DE.05 Protoferro-anthophyllite! (Fe,Mn)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

09.DE.05 Fluoro-sodic-pedrizite! NaLi2(Mg2Al2Li)S5Si8O22F2 C 2/m 2/m

09.DE.05 Sodic-ferri-ferropedrizite! NaLi2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

09.DE.05 Manganocummingtonite Na(Na,Mn)2(Mg4,Fe)5Si8O22(OH)2 C 2/m 2/m

09.DE.05 Protoanthophyllite! (Mg,Fe)7Si8O22(OH)2 Pnmn 2/m 2/m 2/m

09.DE.05 Ferri-clinoferroholmquistite! []Li2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

09.DE.05 Sodic-ferripedrizite! Na(LiNa)(Fe2Mg2Li)Si8O22(OH,F)2 C 2/m 2/m

09.DE.05 Ferripedrizite! NaLi2(Fe2Mg2Li)Si8O22(OH)2 C 2/m 2/m

Other Anthophyllite Information

See Also:

Links to other databases for Anthophyllite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - Scandinavian mineral gallery
17 - University of Colorado - Mineral Structure Data
18 - WWW-MINCRYST

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

Anthophyllite

[ ]Mg7Si8O22(OH)2
Dana No: 66.01.02.02 Strunz No: 09.DE.05
Locality:

Notes:

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