Pyrobelonite Mineral Data

General Pyrobelonite Information

Chemical Formula:

PbMn(VO4)(OH)

Composition:

Molecular Weight = 394.08 gm

Manganese 13.94 % Mn 18.00 % MnO

Vanadium 12.93 % V 23.08 % V₂O₅

Hydrogen 0.26 % H 2.29 % H₂O

Lead 52.58 % Pb 56.64 % PbO

Oxygen 20.30 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbMn²⁺(VO₄)(OH)

Environment:

Typically in metamorphosed Fe-Mn deposits.

IMA Status:

Valid Species (Pre-IMA) 1919

Locality:

Långban mine, Bergslagen ore district, Filipstad, Värmland (Wermland), Sweden. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for "fire" and "needle", in allusion to the color and habit.

Name Pronunciation:

Pyrobelonite + Pronunciation

Synonym:

ICSD 22301

PDF 20-588

Pyrobelonite Image

Images:

Pyrobelonite

Comments: Scanning electron microscope picture, showing idiomorphic pyrobelonite crystals (pb) growing on, and intergrown with brackebuschite (bk). (Eur. J. Mineral, 13:147).
Location: Mullock dumps lining the outcrop of the manganite vein south of Krettnich, Saarland, Germany. Scale: See Image.
© Eur. J. Mineral

Pyrobelonite Crystallography

Axial Ratios:

a:b:c =0.8039:1:0.6501

Cell Dimensions:

a = 7.644, b = 9.508, c = 6.182, Z = 4; V = 449.30 Den(Calc)= 5.83

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnam

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

By Intensity(I/I_o): 3.252(1), 2.643(0.7), 5.172(0.7),

Forms:

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Forms: ( 0 3 1) ( 2 0 1) ( 1 1 1) ( 1 1 0) ( 2 2 1)

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Crystal Structure:

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Donaldson D M , Barnes W H , American Mineralogist , 40 (1955) p.580-596, The structures of the minerals of the descloizite and adelite groups: II -, pyrobelonite.

View Additional jPOWD Structure files for Pyrobelonite
[1]

Physical Properties of Pyrobelonite

Cleavage:

None

Color:

Dark red.

Density:

5.377

Diaphaneity:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

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

Hardness:

3.5 - Copper Penny

Luster:

Adamantine

Streak:

red orange

Optical Properties of Pyrobelonite

Gladstone-Dale:

CI meas= -0.274 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.175 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2316,KPDmeas= 0.2511,KC= 0.197
Ncalc = 2.06 - 2.15

Optical Data:

Biaxial (-), a=2.32, b=2.36, g=2.37, bire=0.0500, 2V(Calc)=52, 2V(Meas)=29. Dispersion r > v.

Pleochroism (x):

shades of brown.

Pleochroism (y):

shades of brown.

Pleochroism (z):

shades of brown.

RL Anisotrophism:

Strong.

RL Bireflectance:

Observable.

RL Color:

Gray with red and orange internal reflections.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Pyrobelonite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	17.00	19.70
420 nm	16.70	19.30
440 nm	16.50	18.90
460 nm	16.20	18.50
480 nm	16.00	18.20
500 nm	15.70	17.80
520 nm	15.50	17.40
540 nm	15.20	17.00
560 nm	15.00	16.70
580 nm	14.80	16.50
600 nm	14.70	16.30
620 nm	14.60	16.10
640 nm	14.50	16.00
660 nm	14.30	15.80
680 nm	14.20	15.70
700 nm	14.10	15.60

**Calculated Relative Intensity Colors of Pyrobelonite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%	600%
R₁
R₂

Calculated Properties of Pyrobelonite

Electron Density:

Bulk Density (Electron Density)=5.06 gm/cc
note: Specific Gravity of Pyrobelonite =5.83 gm/cc.

Fermion Index:

Fermion Index = 0.11
Boson Index = 0.89

Photoelectric:

PE_Pyrobelonite= 936.74 barns/electron
U=PE_Pyrobelonite x rElectron Density=4,739.40 barns/cc.

Radioactivity:

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

Pyrobelonite Classification

Dana Class:

41.05.02.03 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.05)where (A B)2 (XO4) Zq

(41.05.02)Descloizite Group

41.05.02.01 Descloizite PbZn(VO4)(OH) Pnam 2/m 2/m 2/m

41.05.02.02 Mottramite PbCu(VO4)(OH) Pnam 2/m 2/m 2/m

41.05.02.03 Pyrobelonite PbMn(VO4)(OH) Pnam 2/m 2/m 2/m

41.05.02.04 Cechite Pb(Fe,Mn)(VO4)(OH) Pnam 2/m 2/m 2/m

41.05.02.05 Duftite-alpha PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

Strunz Class:

08.BH.40 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1

08.BH.40 Descloizite PbZn(VO4)(OH) Pnam 2/m 2/m 2/m

08.BH.40 Cechite Pb(Fe,Mn)(VO4)(OH) Pnam 2/m 2/m 2/m

08.BH.40 Duhamelite? Pb2Cu4Bi(VO4)4(OH)3•8(H2O) Unk Ortho

08.BH.40 Pyrobelonite PbMn(VO4)(OH) Pnam 2/m 2/m 2/m

08.BH.40 Mottramite PbCu(VO4)(OH) Pnam 2/m 2/m 2/m

Other Pyrobelonite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Pyrobelonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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

Pyrobelonite

PbMn(VO4)(OH)
Dana No: 41.05.02.03 Strunz No: 08.BH.40
Locality:

Notes: