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Vonsenite Mineral Data
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General Vonsenite Information
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 Chemical Formula: |
Fe++2Fe+++BO5 |
| Composition: |
Molecular Weight = 258.35 gm |
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Iron 64.85 % Fe 55.62 % FeO / 30.91 % Fe2O3 |
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Boron 4.18 % B 13.47 % B2O3 |
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Oxygen 30.96 % O |
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______ ______ |
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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. |
| Name Pronunciation: |
Vonsenite + Pronunciation  |
| Synonym: |
ICSD 31214 |
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PDF 25-395 |
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Vonsenite Image |
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Images:
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Vonsenite Crystallography
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| 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 - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbam |
| X Ray Diffraction: |
By Intensity(I/Io): 2.575(1), 5.15(0.3), 1.536(0.17), |
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Physical Properties of Vonsenite
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| Cleavage: |
None |
| Color: |
Greenish black, Black. |
| Density: |
4.21 |
| Diaphaneity: |
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 |
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Optical Properties of Vonsenite
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| Optical Data: |
Biaxial (+) |
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NCalc= 2.11 - from Gladstone-Dale relationship (KC = 0.2309) where Ncalc=Dcalc*KC+1
NCalc= 1.97 - from Gladstone-Dale relationship (KC = 0.2309) where Ncalc=Dmeas*KC+1
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| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Vonsenite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
14.20 |
14.90 |
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| 420 nm |
13.80 |
14.70 |
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| 440 nm |
13.40 |
14.60 |
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| 460 nm |
13.10 |
14.40 |
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| 480 nm |
12.90 |
14.40 |
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| 500 nm |
12.60 |
14.20 |
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| 520 nm |
12.40 |
14.30 |
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| 540 nm |
12.20 |
14.50 |
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| 560 nm |
12.00 |
14.50 |
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| 580 nm |
11.90 |
14.60 |
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| 600 nm |
11.40 |
14.60 |
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| 620 nm |
11.30 |
14.70 |
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| 640 nm |
10.70 |
14.50 |
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| 660 nm |
10.40 |
14.30 |
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| 680 nm |
9.66 |
14.10 |
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| 700 nm |
9.71 |
14.40 |
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Calculated Relative Intensity Colors of Vonsenite in Air
Relative
Intensity |
0% |
80% |
100% |
160% |
240% |
320% |
400% |
480% |
560% |
640% |
720% |
780% |
| R1 |
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| R2 |
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Calculated Properties of Vonsenite
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| Electron Density: |
Bulk Density (Electron Density)=4.58 gm/cc
note: Specific Gravity of Vonsenite =4.81 gm/cc.
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| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PEVonsenite = 19.83 barns/electron
U=PEVonsenite x rElectron Density= 90.82 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Vonsenite is Not Radioactive |
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Vonsenite Classification
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| Dana Class: |
24.02.01.02 (24)Borates - Anhydrous |
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(24.02)where (A)2 BO2 [XO3] |
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(24.02.01)Ludwigite Group (Space Group: Pbam) |
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24.02.01.01 Ludwigite Mg2FeBO5 Pbam 2/m 2/m 2/m |
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24.02.01.02 Vonsenite Fe2FeBO5 Pbam 2/m 2/m 2/m |
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24.02.01.03 Azoproite (Mg,Fe)2(Fe,Ti,Mg)BO5 Pbam 2/m 2/m 2/m |
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24.02.01.04 Bonaccordite Ni2FeBO5 Pbam 2/m 2/m 2/m |
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24.02.01.05 Chestermanite Mg2(Fe,Mg,Al,Sb)BO3O2 Pbam 2/m 2/m 2/m |
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24.02.01.06 Fredrikssonite Mg2(Mn,Fe)O2(BO3) Pbam 2/m 2/m 2/m |
| Strunz Class: |
06.AB.30 06 - BORATES |
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06.A - Monoborates |
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06.AB -BO3, with additional anions; 1(D) + OH, etc. |
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06.AB.30 Azoproite (Mg,Fe)2(Fe,Ti,Mg)BO5 Pbam 2/m 2/m 2/m |
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06.AB.30 Bonaccordite Ni2FeBO5 Pbam 2/m 2/m 2/m |
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06.AB.30 Fredrikssonite Mg2(Mn,Fe)O2(BO3) Pbam 2/m 2/m 2/m |
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06.AB.30 Ludwigite Mg2FeBO5 Pbam 2/m 2/m 2/m |
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06.AB.30 Vonsenite Fe2FeBO5 Pbam 2/m 2/m 2/m |
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Other Vonsenite Information
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| References: |
NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic5) |
| See Also: |
Links to other databases for Vonsenite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Vonsenite Specimen Label here :
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Vonsenite
Fe++2Fe+++BO5
Dana No: 24.02.01.02 Strunz No: 06.AB.30
Locality:
Notes:
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