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Blossite Mineral Data
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General Blossite Information
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 Chemical Formula: |
Cu2V+++++2O7 |
| Composition: |
Molecular Weight = 340.97 gm |
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Vanadium 29.88 % V 53.34 % V2O5 |
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Copper 37.27 % Cu 46.66 % CuO |
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Oxygen 32.85 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Cu2V5+2O7 |
| Environment: |
A very rare sublimate, probably formed between 100-200 deg C, from the outer sulfate zone of a fumarole in the crater of a basaltic composite volcano. |
| IMA Status: |
Approved IMA 1986 |
| Locality: |
Summit crater of Izalco Volcano, San Salvador. Link to MinDat.org Location Data. |
| Name Origin: |
Named for F. Donald Bloss, American mineralogist, Virginia Polytechnic Institute, Blacksburg, Virginia. |
| Name Pronunciation: |
Blossite  |
| Synonym: |
ICSD 1831 |
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PDF 26-566 |
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Blossite Crystallography
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| Axial Ratios: |
a:b:c =2.4637:1:0.7681 |
| Cell Dimensions: |
a = 20.676, b = 8.392, c = 6.446, Z = 8; V = 1,118.46 Den(Calc)= 4.05 |
| Crystal System: |
Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: F dd2 |
| X Ray Diffraction: |
By Intensity(I/Io): 3.08(1), 3.26(1), 2.483(0.8),3.22(0.8), 1.712(0.7), 2.096(0.7), 2.102(0.7), |
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Physical Properties of Blossite
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| Color: |
Black. |
| Density: |
3.95 - 3.97, Average = 3.96 |
| Diaphaneity: |
Opaque |
| Habit: |
Anhedral Grains - Granular minerals without the expression of crystal shapes |
| Luster: |
Metallic |
| Streak: |
red brown |
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Optical Properties of Blossite
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| Optical Data: |
NCalc= 2.06 - from Gladstone-Dale relationship (KC = 0.2607) where Ncalc=Dcalc*KC+1
NCalc= 2.03 - from Gladstone-Dale relationship (KC = 0.2607) where Ncalc=Dmeas*KC+1
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| RL Anisotrophism: |
Moderate, gray to creamy gray-brown. |
| RL Bireflectance: |
Weak to moderate, in shades of cream-white. |
| RL Color: |
White, with red-brown internal reflections. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Blossite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 481 nm |
14.60 |
15.30 |
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| 547 nm |
15.40 |
16.60 |
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| 591 nm |
14.80 |
16.70 |
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| 644 nm |
14.50 |
15.70 |
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Calculated Relative Intensity Colors of Blossite in Air
Relative
Intensity |
0% |
60% |
100% |
120% |
180% |
240% |
300% |
360% |
420% |
480% |
540% |
600% |
| R1 |
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| R2 |
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Calculated Properties of Blossite
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| Electron Density: |
Bulk Density (Electron Density)=3.80 gm/cc
note: Specific Gravity of Blossite =4.05 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0009046683
Boson Index = 0.9990953317 |
| Photoelectric: |
PEBlossite = 22.56 barns/electron
U=PEBlossite x rElectron Density= 85.76 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Blossite is Not Radioactive |
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Blossite Classification
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| Dana Class: |
38.05.06.01 (38)Anhydrous Phosphates, etc |
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(38.05)with miscellaneous formulae |
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(38.05.06)Dana Group |
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38.05.06.01 Blossite Cu2V2O7 F dd2 mm2 |
| Strunz Class: |
08.FA.05 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.F - Polyphosphates, Polyarsenates, [4]-Polyvanadates |
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08.FA -Polyphosphates, etc., without OH and H2O; dimers of corner-sharing RO4 tetrahedra. |
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08.FA.05 Blossite Cu2V2O7 F dd2 mm2 |
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Other Blossite Information
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| References: |
NAME( AntBidBlaNic3) PHYS. PROP.(Am.Min.,Vol.72,p397-400,1987) OPTIC PROP.(AntBidBlaNic3) |
| See Also: |
Links to other databases for Blossite :
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 Blossite Specimen Label here :
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Blossite
Cu2V+++++2O7
Dana No: 38.05.06.01 Strunz No: 08.FA.05
Locality:
Notes:
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