Vonsenite Mineral Data

Vonsenite Mineral Data +

General Vonsenite Information

Chemical Formula:

Fe++2Fe+++BO5

Composition:

Molecular Weight = 258.35 gm

Iron 64.85 % Fe 55.62 % FeO / 30.91 % Fe₂O₃

Boron 4.18 % B 13.47 % B₂O₃

Oxygen 30.96 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺₂Fe³⁺BO₅

Environment:

Uncommon in boron-rich skarns.

IMA Status:

Valid Species (Pre-IMA) 1920

Locality:

Old City Quarry, Riverside, Riverside County, California, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Magnus Vonsen (1879-1954), amateur mineralogist and mineral collector who discovered the mineral.

Synonym:

ICSD 31214

PDF 25-395

Vonsenite Image

Images:

Vonsenite

Comments: Opaque vonsenite microcrystal.
Location: Colle del Pero Quarry, Laghelto di Montecompatri, Rome, Lazio, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Vonsenite Crystallography

Axial Ratios:

a:b:c =0.7692:1:0.25

Cell Dimensions:

a = 9.452, b = 12.287, c = 3.072, Z = 4; V = 356.77 Den(Calc)= 4.81

Crystal System:

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

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

By Intensity(I/I_o): 2.575(1), 5.15(0.3), 1.536(0.17),

Crystal Structure:

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Swinnea J S , Steinfink H , American Mineralogist , 68 (1983) p.827-832, Crystal structure and Mossbauer spectrum of vonsenite, 2FeO*FeBO3

Physical Properties of Vonsenite

Cleavage:

None

Color:

Greenish black, Black.

Density:

4.21

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

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

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

5 - Apatite

Luster:

Adamantine - Metallic

Streak:

black

Optical Properties of Vonsenite

Optical Data:

Biaxial (+)

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Vonsenite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	14.20	14.90
420 nm	13.80	14.70
440 nm	13.40	14.60
460 nm	13.10	14.40
480 nm	12.90	14.40
500 nm	12.60	14.20
520 nm	12.40	14.30
540 nm	12.20	14.50
560 nm	12.00	14.50
580 nm	11.90	14.60
600 nm	11.40	14.60
620 nm	11.30	14.70
640 nm	10.70	14.50
660 nm	10.40	14.30
680 nm	9.66	14.10
700 nm	9.71	14.40

**Calculated Relative Intensity Colors of Vonsenite in Air**
Relative Intensity	0%	80%	100%	160%	240%	320%	400%	480%	560%	640%	720%	780%
R₁
R₂

Calculated Properties of Vonsenite

Electron Density:

r_electron=4.58 gm/cc
note: r_Vonsenite=4.81 gm/cc.

Fermion Index

Fermion Index = 0.02222
Boson Index = 0.97778

Photoelectric:

PE_Vonsenite= 19.83 barns/electron
U=PE_Vonsenite x r_electron= 90.82 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Vonsenite is Not Radioactive

Vonsenite Classification

Dana Class:

24.2.1.2 (24)Borates - Anhydrous

(24.2)where (A)2 BO2 [XO3]

(24.2.1)Ludwigite Group (Space Group: Pbam)

24.2.1.1 Ludwigite Mg2FeBO5 Pbam 2/m 2/m 2/m

24.2.1.2 Vonsenite Fe2FeBO5 Pbam 2/m 2/m 2/m

24.2.1.3 Azoproite (Mg,Fe)2(Fe,Ti,Mg)BO5 Pbam 2/m 2/m 2/m

24.2.1.4 Bonaccordite Ni2FeBO5 Pbam 2/m 2/m 2/m

24.2.1.5 Chestermanite Mg2(Fe,Mg,Al,Sb)BO3O2 Pbam 2/m 2/m 2/m

24.2.1.6 Fredrikssonite Mg2(Mn,Fe)O2(BO3) Pbam 2/m 2/m 2/m

Strunz Class:

V/G.04-20 V - Nitrates, Carbonates and Borates

V/G - "Insel" borates [BO3]3- "inseln"

V/G.04 - Ludwigite group

V/G.04-10 Ludwigite Mg2FeBO5 Pbam 2/m 2/m 2/m

V/G.04-20 Vonsenite Fe2FeBO5 Pbam 2/m 2/m 2/m

V/G.04-30 Azoproite (Mg,Fe)2(Fe,Ti,Mg)BO5 Pbam 2/m 2/m 2/m

V/G.04-40 Chestermanite Mg2(Fe,Mg,Al,Sb)BO3O2 Pbam 2/m 2/m 2/m

V/G.04-50 Fredrikssonite Mg2(Mn,Fe)O2(BO3) Pbam 2/m 2/m 2/m

V/G.04-60 Bonaccordite Ni2FeBO5 Pbam 2/m 2/m 2/m

V/G.04-70 Takeuchiite Mg2MnO2(BO3) Pnnm 2/m 2/m 2/m

V/G.04-80 Orthopinakiolite (Mg,Mn)2MnBO5 Pnnm 2/m 2/m 2/m

V/G.04-90 Blatterite (Mn,Mg)35Sb3(Mn,Fe)9(BO3)16O32 Pnnm 2/m 2/m 2/m

V/G.04-100 Gaudefroyite Ca4Mn3-x(BO3)3(CO3)(O,OH)3 P 6₃ 6

Other Vonsenite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic5)

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Vonsenite

Fe++2Fe+++BO5
Dana No: 24.2.1.2 Strunz No: V/G.04-20
Locality:

Notes: