Pyrophanite Mineral Data

Pyrophanite Mineral Data +

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General Pyrophanite Information

Chemical Formula:

MnTiO3

Composition:

Molecular Weight = 150.82 gm

Titanium 31.75 % Ti 52.96 % TiO₂

Manganese 36.43 % Mn 47.04 % MnO

Oxygen 31.83 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺TiO₃

Environment:

Principally in metamorphosed manganese deposits, less commonly as an accessory mineral in granite, amphibolite, and serpentinites.

IMA Status:

Valid Species (Pre-IMA) 1890

Locality:

Jartstig mine, Pajsberg, Hear Persberg, Vermland, Sweden. Link to MinDat.org Location Data.

Name Origin:

From the Greek pyr - "fire" and fanos - "shining."

Synonym:

ICSD 6006

PDF 29-902

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Pyrophanite Crystallography

Axial Ratios:

a:c = 1:2.78177

Cell Dimensions:

a = 5.137, c = 14.29, Z = 6; V = 326.57 Den(Calc)= 4.60

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

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

By Intensity(I/I_o): 2.78(1), 2.57(0.9), 1.745(0.8),

Crystal Structure:

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Mitchell R H , Liferovich R P , The Canadian Mineralogist , 42 (2004) p.1871-1880, The pyrophanite-ecandrewsite solid-solution: crystal structures, of the Mn1-xZnxSiO3 series (0.1 <= x <= 0.8), Sample: x = .1, ilmenite structure

View Additional jPOWD Structure files for Pyrophanite
[1] [2] [3] [4] [5]

Physical Properties of Pyrophanite

Cleavage:

[0221] Perfect

Color:

Blood red, Green yellow, Dark red.

Density:

4.5 - 4.53, Average = 4.51

Diaphaniety:

Subtranslucent to opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Scaly - Morphology like fish scales.

Hardness:

5 - Apatite

Luster:

Sub Metallic

Streak:

ochre yellow

Optical Properties of Pyrophanite

Dichroism (e):

orange.

Dichroism (w):

orange.

Gladstone-Dale:

CI meas= 0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2924,KPDmeas= 0.2979,KC= 0.3008

Optical Data:

Uniaxial (-), e=2.21, w=2.48, bire=0.2700.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Pyrophanite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	23.50	19.90
420 nm	22.70	19.60
440 nm	21.80	18.90
460 nm	21.10	18.20
480 nm	20.40	17.60
500 nm	19.90	17.10
520 nm	19.40	16.70
540 nm	19.00	16.30
560 nm	18.80	16.10
580 nm	18.50	15.90
600 nm	18.30	15.70
620 nm	18.20	15.60
640 nm	18.00	15.50
660 nm	17.80	15.40
680 nm	17.80	15.30
700 nm	17.60	15.20

**Calculated Relative Intensity Colors of Pyrophanite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%	550%
R₁
R₂

Calculated Properties of Pyrophanite

Electron Density:

r_electron=4.25 gm/cc
note: r_Pyrophanite=4.52 gm/cc.

Fermion Index

Fermion Index = 0.0412
Boson Index = 0.9588

Photoelectric:

PE_Pyrophanite= 14.91 barns/electron
U=PE_Pyrophanite x r_electron= 63.38 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pyrophanite is Not Radioactive

Pyrophanite Classification

Dana Class:

4.3.5.3 (4)Simple Oxides

(4.3)with a cation charge of 3+ (A+++2 O3)

(4.3.5)Dana Group

4.3.5.1 Ilmenite FeTiO3 R 3 3

4.3.5.2 Geikielite MgTiO3 R 3 3

4.3.5.3 Pyrophanite MnTiO3 R 3 3

4.3.5.4 Ecandrewsite (Zn,Fe,Mn)TiO3 R 3 3

4.3.5.5 Melanostibite Mn(Sb,Fe)O3 R 3 3

4.3.5.6 Brizziite-III NaSbO3 R 3 3

4.3.5.7 Akimotoite! (Mg,Fe)SiO3 R 3 3

Strunz Class:

IV/C.05-30 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.05 - Ilmenite group, Geikilith - Brizziite series

IV/C.05-05 Akimotoite! (Mg,Fe)SiO3 R 3 3

IV/C.05-10 Geikielite MgTiO3 R 3 3

IV/C.05-20 Ilmenite FeTiO3 R 3 3

IV/C.05-30 Pyrophanite MnTiO3 R 3 3

IV/C.05-40 Ecandrewsite (Zn,Fe,Mn)TiO3 R 3 3

IV/C.05-50 Melanostibite Mn(Sb,Fe)O3 R 3 3

IV/C.05-60 Brizziite-III NaSbO3 R 3 3

IV/C.05-60* Brizziite-VII NaSbO3 R 3 3

Other Pyrophanite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

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Pyrophanite

MnTiO3
Dana No: 4.3.5.3 Strunz No: IV/C.05-30
Locality:

Notes: