Manganocummingtonite Mineral Data

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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:

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),

Crystal Structure:

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Hawthorne F C , Grundy H D , The Canadian Mineralogist , 15 (1977) p.309-320, The crystal structure and site-chemistry of a zincian tirodite, by least-squares refinement of X-ray and mossbauer data

Physical Properties of Manganocummingtonite

Cleavage:

{110} Perfect, {100} Indistinct

Color:

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

Density:

3.07

Diaphaneity:

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, Short UV=red to deep pink, Long UV=red to deep pink.

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
Ncalc = 1.67 - 1.68

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.

Calculated Properties of Manganocummingtonite

Electron Density:

Bulk Density (Electron Density)=3.04 gm/cc
note: Specific Gravity of Manganocummingtonite =3.07 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

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

Radioactivity:

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

Manganocummingtonite Classification

Dana Class:

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

(66.01)with P=2 amphibole configuration

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

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

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

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

66.01.01.03b Permanganogrunerite! []Mn4(Fe)3(Si8O22)(OH)2 C 2/m 2/m

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

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

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

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

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

66.01.01.08a Ferri-clinoholmquistite! []Li2Mg3(Fe3)2(Si8O22)(OH)2 C 2/m 2/m

66.01.01.08b Ferri-clinoferroholmquistite! []Li2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

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

66.01.01.09a Ferripedrizite! NaLi2(Fe2Mg2Li)Si8O22(OH)2 C 2/m 2/m

66.01.01.09b Sodic-ferri-ferropedrizite! NaLi2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

66.01.01.09c Fluoro-sodic-pedrizite! NaLi2(Mg2Al2Li)S5Si8O22F2 C 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 Manganocummingtonite Information

See Also:

Links to other databases for Manganocummingtonite :
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

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Manganocummingtonite

Na(Na,Mn)2(Mg4,Fe+++)5Si8O22(OH)2
Dana No: 66.01.01.04 Strunz No: 09.DE.05
Locality:

Notes: