Ferropyrosmalite Mineral Data

Ferropyrosmalite Mineral Data +

General Ferropyrosmalite Information

Chemical Formula:

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

Composition:

Molecular Weight = 1,053.90 gm

Magnesium 0.23 % Mg 0.38 % MgO

Manganese 3.65 % Mn 4.71 % MnO

Iron 38.15 % Fe 49.08 % FeO

Silicon 15.99 % Si 34.21 % SiO₂

Hydrogen 0.90 % H 8.03 % H₂O

Chlorine 4.04 % Cl 4.04 % Cl

- % Cl -0.91 % -O=Cl₂

Oxygen 37.04 % O

______ ______

100.00 % 99.54 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_7.2Mn²⁺_0.7Mg_0.1Si₆O₁₅(OH)_9.4Cl_1.2

Environment:

Metamorphosed Pb-Zn deposit ores.

IMA Status:

Approved IMA 1987

Locality:

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

Name Origin:

Iron rich end member of pyrosmalite.

Synonym:

Pyrosmalite

Ferropyrosmalite Image

Images:

Ferropyrosmalite

Comments: Crystal of ferropyrosmalite on clinochlore schist.
Location: Normark, Wermland, Sweden. Scale: Crystal size 1 cm.
© John Veevaert

Ferropyrosmalite Crystallography

Axial Ratios:

a:c = 1:0.53338

Cell Dimensions:

a = 13.33, c = 7.11, Z = 2; V = 1,094.11 Den(Calc)= 3.20

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): 2.675(1), 7.13(0.8), 3.564(0.6),

Physical Properties of Ferropyrosmalite

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:

light green

Optical Properties of Ferropyrosmalite

Gladstone-Dale:

CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2063,KPDmeas= 0.2112,KC= 0.2135

Optical Data:

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

Calculated Properties of Ferropyrosmalite

Electron Density:

r_electron=3.05 gm/cc
note: r_{Ferropyrosmalite}=3.13 gm/cc.

Fermion Index

Fermion Index = 0.01596
Boson Index = 0.98404

Photoelectric:

PE_{Ferropyrosmalite}= 13.18 barns/electron
U=PE_{Ferropyrosmalite} x r_electron= 40.26 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferropyrosmalite is Not Radioactive

Ferropyrosmalite Classification

Dana Class:

72.4.1a.1 (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.28-10 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 Ferropyrosmalite Information

References:

NAME( Ford32) PHYS. PROP.(Bull.Miner.,Vol.107-111,1984-1988) OPTIC PROP.(Ford32)

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Ferropyrosmalite

(Fe++,Mn)8Si6O15(OH,Cl)10
Dana No: 72.4.1a.1 Strunz No: VIII/H.28-10
Locality:

Notes: