Manganpyrosmalite Mineral Data

Manganpyrosmalite Mineral Data +

General Manganpyrosmalite Information

Chemical Formula:

(Mn,Fe++)8Si6O15(OH,Cl)10

Composition:

Molecular Weight = 1,071.52 gm

Manganese 29.74 % Mn 38.40 % MnO

Iron 9.38 % Fe 12.07 % FeO

Silicon 15.73 % Si 33.64 % SiO₂

Hydrogen 0.56 % H 5.04 % H₂O

Chlorine 13.23 % Cl 13.23 % Cl

- % Cl -2.99 % -O=Cl₂

Oxygen 31.36 % O

______ ______

100.00 % 99.40 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_5.8Fe²⁺_1.8Si₆O₁₅(OH)₆Cl₄

Environment:

Metamorphosed iron and manganese ores.

IMA Status:

Valid Species (Pre-IMA) 1953

Locality:

Nordmark in Vermland and at Dannemora, in Upsala, Sweden. Link to MinDat.org Location Data.

Name Origin:

Manganese end member of pyrosmalite.

Synonym:

Brokenhillite

Pyrosmalite

Manganpyrosmalite Image

Images:

Manganpyrosmalite

Comments: Greenish brown, blocky crystals of manganpyrosmalite in matrix. Individual crystals are up to 7 mm long.
Location: Nordmark, Varmland, Sweden. Scale: Picture size 5 cm.
© John Veevaert

Images:

Manganpyrosmalite

Comments: Hexagonal, light brown crystals of manganpyrosmalite.
Location: Nordmark, Filipstad, Varmland, Sweden. Scale: Crystal size 1.5 mm.
© Tom Loomis / Dakota Matrix

Manganpyrosmalite Crystallography

Axial Ratios:

a:c = 1:0.53592

Cell Dimensions:

a = 13.36, c = 7.16, Z = 2; V = 1,106.77 Den(Calc)= 3.22

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 3m1

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

By Intensity(I/I_o): 7.16(1), 2.683(0.9), 3.583(0.8),

Crystal Structure:

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Kato T , Takeuchi Y , The Canadian Mineralogist , 21 (1983) p.1-6, The pyrosmalite group of minerals I. Structure refinement of, Manganpyrosmalite, Sample 1: Iron-rich manganpyrosmalite, Kyurazawa mine, Japan

View Additional jPOWD Structure files for Manganpyrosmalite
[1]

Physical Properties of Manganpyrosmalite

Cleavage:

[0001] Good

Color:

Green blackish, Pale liver brown, Gray.

Density:

3.06 - 3.19, Average = 3.12

Diaphaniety:

Translucent to subtranslucent

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Habit:

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

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

brownish yellow

Optical Properties of Manganpyrosmalite

Dichroism (e):

colorless.

Dichroism (w):

pistachio green.

Gladstone-Dale:

CI meas= 0.071 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.098 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.205,KPDmeas= 0.2112,KC= 0.2273

Optical Data:

Uniaxial (-), e=1.64, w=1.68, bire=0.0400.

Calculated Properties of Manganpyrosmalite

Electron Density:

r_electron=3.02 gm/cc
note: r_{Manganpyrosmalite}=3.13 gm/cc.

Fermion Index

Fermion Index = 0.00948
Boson Index = 0.99052

Photoelectric:

PE_{Manganpyrosmalite}= 11.92 barns/electron
U=PE_{Manganpyrosmalite} x r_electron= 36.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Manganpyrosmalite is Not Radioactive

Manganpyrosmalite Classification

Dana Class:

72.4.1a.2 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.4)with 4-, 6-, and 12-membered rings

(72.4.1a)Pyrosmalite group (Pyrosmalite subgroup)

72.4.1a.1 Ferropyrosmalite (Fe,Mn)8Si6O15(OH,Cl)10 P 3m1 3 2/m

72.4.1a.2 Manganpyrosmalite (Mn,Fe)8Si6O15(OH,Cl)10 P 3m1 3 2/m

72.4.1a.3 Schallerite Mn16[AsO2OH][Si12O30](OH)14 P 3m1 ? 3m

Strunz Class:

VIII/H.28-20 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others

VIII/H.28 - Pyrosmalite series

VIII/H.28-10 Ferropyrosmalite (Fe,Mn)8Si6O15(OH,Cl)10 P 3m1 3 2/m

VIII/H.28-20 Manganpyrosmalite (Mn,Fe)8Si6O15(OH,Cl)10 P 3m1 3 2/m

VIII/H.28-30 Brokenhillite* (Mn,Fe)32[Si24O60]OH29Cl11 P 6₃mc 6mm

VIII/H.28-40 Nelenite (Mn,Fe)16Si12As3O36(OH)17 R 3m 3 2/m

VIII/H.28-50 Schallerite Mn16[AsO2OH][Si12O30](OH)14 P 3m1 ? 3m

VIII/H.28-70 Friedelite Mn8Si6O15(OH,Cl)10 C 2/m 2/m

VIII/H.28-80 Mcgillite (Mn,Fe)8Si6O15(OH)8Cl2 C 2/m 2/m

VIII/H.28-90 Bementite Mn8Si6O15(OH)10 P 2₁/c 2/m

VIII/H.28-100 Varennesite Na8Mn2Si10O25(OH,Cl)2·12(H2O) C mcm 2/m 2/m 2/m

Other Manganpyrosmalite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

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

Manganpyrosmalite

(Mn,Fe++)8Si6O15(OH,Cl)10
Dana No: 72.4.1a.2 Strunz No: VIII/H.28-20
Locality:

Notes: