Pyrosmalite-(Mn) Mineral Data

General Pyrosmalite-(Mn) 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

Manganpyrosmalite - Renamed to Pyrosmalite-(Mn) by Mineralogical Record, v39 (2008), p 131

Pyrosmalite-(Mn) Image

Images:

Pyrosmalite-(Mn)

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:

Pyrosmalite-(Mn)

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

Pyrosmalite-(Mn) 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, Note: sample 2, Note: z-coordinate for AlM4 changed, Locality: Kyurazawa mine, Japan

Physical Properties of Pyrosmalite-(Mn)

Cleavage:

{0001} Good

Color:

Green blackish, Pale liver brown, Gray.

Density:

3.06 - 3.19, Average = 3.12

Diaphaneity:

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 Pyrosmalite-(Mn)

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
Ncalc = 1.7 - 1.73

Optical Data:

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

Calculated Properties of Pyrosmalite-(Mn)

Electron Density:

Bulk Density (Electron Density)=3.02 gm/cc
note: Specific Gravity of Pyrosmalite-(Mn) =3.13 gm/cc.

Fermion Index:

Fermion Index = 0.0094844898
Boson Index = 0.9905155102

Photoelectric:

PE_{Pyrosmalite-(Mn)}= 11.92 barns/electron
U=PE_{Pyrosmalite-(Mn)} x rElectron Density= 36.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pyrosmalite-(Mn) is Not Radioactive

Pyrosmalite-(Mn) Classification

Dana Class:

72.04.01a.02 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

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

(72.04.01a)Pyrosmalite group (Pyrosmalite subgroup)

72.04.01a.01 Pyrosmalite-(Fe) (Fe,Mn)8Si6O15(OH,Cl)10 P 3m1 3 2/m

72.04.01a.02 Pyrosmalite-(Mn) (Mn,Fe)8Si6O15(OH,Cl)10 P 3m1 3 2/m

72.04.01a.03 Schallerite Mn16[AsO2OH][Si12O30](OH)14 P 3m1 ? 3m

Strunz Class:

09.EE.10 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EE -Single tetrahedral nets of 6-membered rings

09.EE.10 Brokenhillite* (Mn,Fe)32[Si24O60]OH29Cl11 P 6₃mc 6mm

09.EE.10 Friedelite Mn8Si6O15(OH,Cl)10 C 2/m 2/m

09.EE.10 Mcgillite (Mn,Fe)8Si6O15(OH)8Cl2 C 2/m 2/m

09.EE.10 Pyrosmalite-(Fe) (Fe,Mn)8Si6O15(OH,Cl)10 P 3m1 3 2/m

09.EE.10 Pyrosmalite-(Mn) (Mn,Fe)8Si6O15(OH,Cl)10 P 3m1 3 2/m

Other Pyrosmalite-(Mn) Information

References:

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

See Also:

Links to other databases for Pyrosmalite-(Mn) :
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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Print or Cut-and-Paste your Pyrosmalite-(Mn) Specimen Label here :

Pyrosmalite-(Mn)

(Mn,Fe++)8Si6O15(OH,Cl)10
Dana No: 72.04.01a.02 Strunz No: 09.EE.10
Locality:

Notes: