Protomangano-ferro-anthophyllite Mineral Data

Protomangano-ferro-anthophyllite Mineral Data +

General Protomangano-ferro-anthophyllite Information

Chemical Formula:

(Mn++,Fe++)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:

Mn²⁺Fe²⁺₅MgSi₈O₂₂(OH)₂

Environment:

Bedded Mn deposit at Yokoneyama. At the Suishoyama pegmatite the mineral is mixed with clinoamphiboles.

IMA Status:

Approved IMA 1986 (Dana # Added)

Locality:

Yokoneyama, Tochigi Prefecture, Japan. Siushoyama, Fukushima Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

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

Synonym:

IMA1986-007

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Protomangano-ferro-anthophyllite Crystallography

Axial Ratios:

a:b:c =0.5149:1:0.292

Cell Dimensions:

a = 9.425, b = 18.303, c = 5.345, Z = 2; V = 922.04 Den(Calc)= 3.49

Crystal System:

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

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

By Intensity(I/I_o): 3.098(1)(310), 8.366(0.92)(110), 2.548(0.58)(161,251,112),3.285(0.55)(240), 2.881(0.29)(151), 3.701(0.24)(131), 2.027(0.21)(361), 4.584(0.2)(040),

Crystal Structure:

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Sueno S , Matsuura S , Gibbs G V , Boisen M B , Physics and Chemistry of Minerals , 25 (1998) p.366-377, A crystal chemical study of protoanthophyllite:, orthoamphiboles with the protoamphibole structure, Sample: PMFA Yokene Mine

Physical Properties of Protomangano-ferro-anthophyllite

Cleavage:

[210] Perfect

Color:

Light brownish yellow, White.

Density:

3.5

Diaphaniety:

Transparent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

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

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Protomangano-ferro-anthophyllite

Gladstone-Dale:

CI meas= -0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2044,KPDmeas= 0.2038,KC= 0.2019

Optical Data:

Biaxial (-), a=1.695, b=1.714, g=1.731, bire=0.0360

Calculated Properties of Protomangano-ferro-anthophyllite

Electron Density:

r_electron=3.42 gm/cc
note: r_{Protomangano-ferro-anthophyllite}=3.50 gm/cc.

Fermion Index

Fermion Index = 0.01963
Boson Index = 0.98037

Photoelectric:

PE_{Protomangano-ferro-anthophyllite}= 10.97 barns/electron
U=PE_{Protomangano-ferro-anthophyllite} x r_electron= 37.49 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Protomangano-ferro-anthophyllite is Not Radioactive

Protomangano-ferro-anthophyllite Classification

Dana Class:

66.1.2.3b (66)Inosilicate Double-Width Unbranched Chains, W=2

(66.1)Dana Type

(66.1.2)Group 1, the Mg-Fe-Mn-Li amphiboles (Orthorhombic)

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

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

66.1.2.2a Protoanthophyllite! (Mg,Fe)7Si8O22(OH)2 Pnmn 2/m 2/m 2/m

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

66.1.2.3a Protoferro-anthophyllite! (Fe,Mn)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

66.1.2.3b Protomangano-ferro-anthophyllite ! (Mn,Fe)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

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

66.1.2.4a Sodic-ferro-anthophyllite! NaFe7Si8O22(OH)2 P nma 2/m 2/m 2/m

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

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

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

66.1.2.7a Sodic-ferrogedrite! NaFe6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m

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

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

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

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

66.1.2.12 IMA2004-030! []Li2(Fe3Al2)S5(Si8O22)(OH)2 P nma 2/m 2/m 2/m

Strunz Class:

VIII/F.12-140 VIII - Silicates

VIII/F - Inosilicates (chain and band) double chains [Si4O11]6-, Orthorhombic Amphiboles

VIII/F.12 - Amphibole group, Magnesioholmquistite - Ferrogedrite series

VIII/F.12-10 Magnesioholmquistite Li2(Mg,Fe)3Al2Si8O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-20 Holmquistite [](Li2Mg3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-30 Ferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-40 Sodicanthophyllite NaMg7Si8O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-45 Sodic-ferro-anthophyllite! NaFe7Si8O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-50 Magnesioanthophyllite? (Mg,Fe)7Si8O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-60 Anthophyllite []Mg7Si8O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-70 Ferro-anthophyllite []Fe7Si8O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-75 Sodic-ferrogedrite! NaFe6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-80 Sodicgedrite NaMg6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-90 Magnesiogedrite? (Mg,Fe)5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-100 Gedrite []Mg5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-110 Ferrogedrite []Fe5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

VIII/F.12-130 Protoferro-anthophyllite! (Fe,Mn)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

VIII/F.12-140* Protoanthophyllite! (Mg,Fe)7Si8O22(OH)2 Pnmn 2/m 2/m 2/m

VIII/F.12-140 Protomangano-ferro-anthophyllite (Mn,Fe)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

Other Protomangano-ferro-anthophyllite Information

References:

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

See Also:

Links to other databases for Protomangano-ferro-anthophyllite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas 10 - WWW-MINCRYST

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Print or Cut-and-Paste your Protomangano-ferro-anthophyllite Specimen Label here :

Protomangano-ferro-anthophyllite

(Mn++,Fe++)2(Fe++,Mg)5(Si4O11)2(OH)2
Dana No: 66.1.2.3b Strunz No: VIII/F.12-140
Locality:

Notes: