Protoferro-anthophyllite Mineral Data

General Protoferro-anthophyllite Information

Chemical Formula:

(Fe++,Mn++)2(Fe++,Mg)5(Si4O11)2(OH)2

Composition:

Molecular Weight = 969.16 gm

Magnesium 2.51 % Mg 4.16 % MgO

Manganese 5.67 % Mn 7.32 % MnO

Iron 28.81 % Fe 37.07 % FeO

Silicon 23.18 % Si 49.60 % SiO₂

Hydrogen 0.21 % H 1.86 % H₂O

Oxygen 39.62 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺₅Mn²⁺MgSi₈O₂₂(OH)₂

Environment:

Occurs in blocks of fayalite.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Cheyenne Moutain area, El Paso County, Colorado, USA. Found in bedded Mn deposits at Yokoneyama, Tochigi Prefecture, Japan, and also in a pegmatite at Suishoyame, Fukushima Prefecture Link to MinDat.org Location Data.

Name Origin:

The name indicates the structural relationship to protoamphiboles, and the compositional relationship to anthophyllite.

Name Pronunciation:

Protoferro-anthophyllite + Pronunciation

Synonym:

IMA1986-006

Protoferro-anthophyllite Image

Images:

Protoferro-anthophyllite

Comments: Sprays of brown-green prismatic protoferro-anthophyllite crystals.
Location: Nyppio mine, near Utsonomiya, Japan. Scale: See Image.
© Rruff Database

Protoferro-anthophyllite Crystallography

Axial Ratios:

a:b:c =0.5101:1:0.2905

Cell Dimensions:

a = 9.382, b = 18.39, c = 5.343, Z = 2; V = 921.85 Den(Calc)= 3.49

Crystal System:

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

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

By Intensity(I/I_o): 8.353(1)(110), 2.56(0.92)(102,161), 3.074(0.64)(310),3.277(0.33)(240), 1.535(0.31)(0.12.0), 2.317(0.31)(202), 2.879(0.27)(151), 2.761(0.25)(002), 2.537(0.24)(112,251),

Physical Properties of Protoferro-anthophyllite

Cleavage:

{210} Perfect

Color:

Light brownish yellow.

Density:

3.61

Diaphaneity:

Transparent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Protoferro-anthophyllite

Gladstone-Dale:

CI meas= 0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2031,KPDmeas= 0.1963,KC= 0.2019
Ncalc = 1.7 - 1.73

Optical Data:

Biaxial (-), a=1.69, b=1.71, g=1.726, bire=0.0360

Calculated Properties of Protoferro-anthophyllite

Electron Density:

Bulk Density (Electron Density)=3.41 gm/cc
note: Specific Gravity of Protoferro-anthophyllite =3.49 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Protoferro-anthophyllite}= 10.97 barns/electron
U=PE_{Protoferro-anthophyllite} x rElectron Density= 37.39 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Protoferro-anthophyllite is Not Radioactive

Protoferro-anthophyllite Classification

Dana Class:

66.01.02.03a (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 Protoferro-anthophyllite Information

References:

NAME( AmMin) PHYS. PROP.(Am.Min.,Vol.84,p196,1999) OPTIC PROP.(AmMin)

See Also:

Links to other databases for Protoferro-anthophyllite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
11 - WWW-MINCRYST

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Protoferro-anthophyllite

(Fe++,Mn++)2(Fe++,Mg)5(Si4O11)2(OH)2
Dana No: 66.01.02.03a Strunz No: 09.DE.05
Locality:

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