Blossite Mineral Data

General Blossite Information

Chemical Formula:

Cu2V+++++2O7

Composition:

Molecular Weight = 340.97 gm

Vanadium 29.88 % V 53.34 % V₂O₅

Copper 37.27 % Cu 46.66 % CuO

Oxygen 32.85 % O

______ ______

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

PDF 26-566

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Blossite Crystallography

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 - PyramidalH-M Symbol (mm2) Space Group: F dd2

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

By Intensity(I/I_o): 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),

Crystal Structure:

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Robinson P D , Hughes J M , Malinconico M L , American Mineralogist , 72 (1987) p.397-400, Blossite, alpha-Cu2V2O7, a new fumarolic sublimate from Izalco volcano, El Salvador, - data obtained by personal communication, May 2003.

View Additional jPOWD Structure files for Blossite
[1] [2]

Physical Properties of Blossite

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

Optical Properties of Blossite

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

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	∑ R₁(λ)	∑ R₂(λ)
481 nm	14.60	15.30
547 nm	15.40	16.60
591 nm	14.80	16.70
644 nm	14.50	15.70

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

Calculated Properties of Blossite

Electron Density:

Bulk Density (Electron Density)=3.80 gm/cc
note: Specific Gravity of Blossite =4.05 gm/cc.

Fermion Index:

Fermion Index = 0.0009046683
Boson Index = 0.9990953317

Photoelectric:

PE_Blossite= 22.56 barns/electron
U=PE_Blossite x rElectron Density= 85.76 barns/cc.

Radioactivity:

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

Blossite Classification

Dana Class:

38.05.06.01 (38)Anhydrous Phosphates, etc

(38.05)with miscellaneous formulae

(38.05.06)Dana Group

38.05.06.01 Blossite Cu2V2O7 F dd2 mm2

Strunz Class:

08.FA.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.F - Polyphosphates, Polyarsenates, [4]-Polyvanadates

08.FA -Polyphosphates, etc., without OH and H2O; dimers of corner-sharing RO4 tetrahedra.

08.FA.05 Blossite Cu2V2O7 F dd2 mm2

Other Blossite Information

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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Ask about Blossite here :
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Print or Cut-and-Paste your Blossite Specimen Label here :

Blossite

Cu2V+++++2O7
Dana No: 38.05.06.01 Strunz No: 08.FA.05
Locality:

Notes: