Manganocummingtonite Mineral Data

Manganocummingtonite Mineral Data

General Manganocummingtonite Information

Chemical Formula:

Na(Na,Mn)2(Mg4,Fe+++)5Si8O22(OH)2

Composition:

Molecular Weight = 848.70 gm

Sodium 6.77 % Na 9.13 % Na₂O

Magnesium 11.46 % Mg 19.00 % MgO

Manganese 3.24 % Mn 4.18 % MnO

Iron 6.58 % Fe 9.41 % Fe₂O₃

Silicon 26.47 % Si 56.64 % SiO₂

Hydrogen 0.24 % H 2.12 % H₂O

Oxygen 45.24 % O

______ ______

100.00 % 100.47 % = TOTAL OXIDE

Empirical Formula:

NaNa_1.5Mn²⁺_0.5Mg₄Fe³⁺(Si₈O₂₂)(OH)₂

Environment:

Forms a series with Manganogrunerite (Dannemorite).

IMA Status:

Renamed IMA 2003, Formerly Tirodite 1938

Locality:

Tirodi, Madhya Pradesh, India. Link to MinDat.org Location Data.

Name Origin:

Renamed IMA 2003, Formerly Tirodite (1938). Named after its locality.

Synonym:

IMA2003-066

Tirodite - Renamed

Manganocummingtonite Image

Images:

Manganocummingtonite

Comments: Dark green fibrous manganocummingtonite.
Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Manganocummingtonite Crystallography

Axial Ratios:

a:b:c =0.5394:1:0.2944

Cell Dimensions:

a = 9.704, b = 17.99, c = 5.297, Z = 2; beta = 103.51° V = 899.14 Den(Calc)= 3.13

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 2.72(1), 8.28(0.9), 9(0.9),3.06(0.8), 2.51(0.6), 3.24(0.6), 3.41(0.6), 2.96(0.5),

Physical Properties of Manganocummingtonite

Cleavage:

[110] Perfect, [100] Indistinct

Color:

Brownish, Greenish white, Light green, Pink, Straw yellow.

Density:

3.07

Diaphaniety:

Transparent to Translucent

Fracture:

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

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

6-6.5 - Orthoclase-Pyrite

Luminescence:

Fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Manganocummingtonite

Gladstone-Dale:

CI meas= 0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.053 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2066,KPDmeas= 0.2106,KC= 0.2182

Optical Data:

Biaxial (+), a=1.63-1.638, b=1.644-1.651, g=1.652-1.665, bire=0.0220-0.0270

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Manganocummingtonite

Electron Density:

r_electron=3.04 gm/cc
note: r_{Manganocummingtonite}=3.07 gm/cc.

Fermion Index

Fermion Index = 0.02543
Boson Index = 0.97457

Photoelectric:

PE_{Manganocummingtonite}= 4.13 barns/electron
U=PE_{Manganocummingtonite} x r_electron= 12.55 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Manganocummingtonite is Not Radioactive

Manganocummingtonite Classification

Dana Class:

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

(66.1)Dana Type

(66.1.1)Group 1, the Mg-Fe-Mn-Li amphiboles (Monoclinic)

66.1.1.1 Magnesiocummingtonite (Mg,Fe)7Si8O22(OH)2 C 2/m 2/m

66.1.1.2 Cummingtonite []Mg7Si8O22(OH)2 C 2/m 2/m

66.1.1.3 Grunerite []Fe7Si8O22(OH)2 C 2/m 2/m

66.1.1.3b Permanganogrunerite! []Mn4(Fe)3(Si8O22)(OH)2 C 2/m 2/m

66.1.1.4 Manganocummingtonite Na(Na,Mn)2(Mg4,Fe)5Si8O22(OH)2 C 2/m 2/m

66.1.1.5 Manganogrunerite []Mn2Fe5Si8O22(OH) C 2/m 2/m

66.1.1.6 Magnesioclinoholmquistite? Li2(Mg,Fe)3Al2Si8O22(OH)2 C 2/m 2/m

66.1.1.7 Clinoholmquistite? [](Li2Mg3Al2)Si8O22(OH)2 C 2/m 2/m

66.1.1.8 Clinoferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 C 2/m 2/m

66.1.1.8a Ferri-clinoholmquistite! []Li2Mg3(Fe3)2(Si8O22)(OH)2 C 2/m 2/m

66.1.1.8b Ferri-clinoferroholmquistite! []Li2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

66.1.1.9 Sodic-ferripedrizite! Na(LiNa)(Fe2Mg2Li)Si8O22(OH,F)2 C 2/m 2/m

66.1.1.9a Ferripedrizite! NaLi2(Fe2Mg2Li)Si8O22(OH)2 C 2/m 2/m

66.1.1.9b Sodic-ferri-ferropedrizite! NaLi2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

66.1.1.9c Fluoro-sodic-pedrizite! NaLi2(Mg2Al2Li)S5Si8O22F2 C 2/m 2/m

Strunz Class:

VIII/F.07-40 VIII - Silicates

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

VIII/F.07 - Amphibole group, Magnesiocummingtonite - Ferroclinoholmquistite series

VIII/F.07-10 Magnesiocummingtonite (Mg,Fe)7Si8O22(OH)2 C 2/m 2/m

VIII/F.07-20 Cummingtonite []Mg7Si8O22(OH)2 C 2/m 2/m

VIII/F.07-30 Grunerite []Fe7Si8O22(OH)2 C 2/m 2/m

VIII/F.07-40 Manganocummingtonite Na(Na,Mn)2(Mg4,Fe)5Si8O22(OH)2 C 2/m 2/m

VIII/F.07-50 Manganogrunerite []Mn2Fe5Si8O22(OH) C 2/m 2/m

VIII/F.07-55 Permanganogrunerite! []Mn4(Fe)3(Si8O22)(OH)2 C 2/m 2/m

VIII/F.07-60 Magnesioclinoholmquistite? Li2(Mg,Fe)3Al2Si8O22(OH)2 C 2/m 2/m

VIII/F.07-70 Clinoholmquistite? [](Li2Mg3Al2)Si8O22(OH)2 C 2/m 2/m

VIII/F.07-80 Clinoferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 C 2/m 2/m

VIII/F.07-90 Ferri-clinoferroholmquistite! []Li2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

Other Manganocummingtonite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Manganocummingtonite :
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

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

Manganocummingtonite

Na(Na,Mn)2(Mg4,Fe+++)5Si8O22(OH)2
Dana No: 66.1.1.4 Strunz No: VIII/F.07-40
Locality:

Notes: