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Blossite

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Dr. F. Donald Bloss
Formula:
α-Cu2(V2O7)
System:
Orthorhombic
Colour:
Black
Name:
For Dr. F. Donald Bloss, American mineralogist, Virginia Polytechnic Institute, Blacksburg, Virginia, USA.
Dimorphous with Ziesite

Classification of Blossite

Approved
8.FA.05

8 : PHOSPHATES, ARSENATES, VANADATES
F : Polyphosphates, Polyarsenates, [4]-Polyvanadates
A : Polyphosphates, etc., without OH and H2O; dimers of corner-sharing RO4 tetrahedra.
38.5.6.1

38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
5 : Miscellaneous
21.1.7

21 : Vanadates (and vanadates with arsenate or phosphate)
1 : Vanadates of the alkalis and Cu
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Type Occurrence of Blossite

General Appearance of Type Material:
Equant anhedral crystals, to 150 µm, typically intergrown with other fumarolic copper vanadates
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA (No. 164270)
Geological Setting of Type Material:
Sublimates from the outer zone of a fumarole in the crater of a basaltic composite volcano, probably formed between 100 °C and 200 °C
Associated Minerals at Type Locality:

Physical Properties of Blossite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Black
Streak:
Red-brown
Density:
3.95 - 3.97 g/cm3 (Measured)    4.051 g/cm3 (Calculated)
Comment:
On synthetic material

Crystallography of Blossite

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Fdd2
Cell Parameters:
a = 20.676(6) Å, b = 8.392(3) Å, c = 6.446(2) Å
Ratio:
a:b:c = 2.464 : 1 : 0.768
Unit Cell Volume:
V 1,118.46 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Equant crysyals
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.260 (100)
3.080 (100)
3.220 (80)
2.483 (80)
2.102 (70)
2.096 (70)
1.712 (70)
Comments:
Recorded on synthetic α-Cu^2[V^2O^7]; ICDD 26-566

Optical Data of Blossite

Type:
Biaxial
RI values:
n = 2.05
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Type:
Anisotropic
Anisotropism:
Moderate; grey to creamy grey-brown
Bireflectance:
Weak to moderate; in shades of cream-white
Reflectivity:
481 nmR1=14.6%R2= 15.3%
547 nmR1=15.4%R2= 16.6%
591 nmR1=14.8%R2= 16.7%
644 nmR1=14.5%R2= 15.7%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 16.7%.
R1 shown in black, R2 shown in red
Colour in reflected light:
White
Internal Reflections:
Red-brown

Chemical Properties of Blossite

Formula:
α-Cu2(V2O7)
Essential elements:
All elements listed in formula:
Analytical Data:
Electron microprobe analysis of type material
V2O5  (53.28)
CuO   (46.49)

sum    99.77 wt.-%
Empirical Formula:
Cu22+[V25+O7]

Relationship of Blossite to other Species

8.FA.10Ziesiteβ-Cu2(V2O7)
8.FA.15ChervetitePb2(V2O7)
8.FA.15UM1999-17:O:PbVPb4(VO4)2O
8.FA.20Pyrocoproite(K,Na)2Mg(P2O7)
8.FA.20PyrophosphiteK2Ca(P2O7)
8.FA.25Petewilliamsite(Ni,Co)30(As2O7)15
21.1.1MetamuniriteNaVO3
21.1.2MuniriteNaVO3 · 1.9H2O
21.1.3Barnesite(Na,Ca)V6O16 · 3H2O
21.1.4Bannermanite(Na,K)0.7V4+0.7V5+5.3O15
21.1.5HowardevansiteNaCuFe2(VO4)3
21.1.6HuemuliteNa4Mg(V10O28) · 24H2O
21.1.8Ziesiteβ-Cu2(V2O7)
21.1.9StoiberiteCu5(VO4)2O2
21.1.10McbirneyiteCu3(VO4)2
21.1.11FingeriteCu11(VO4)6O2
21.1.12VolborthiteCu3(V2O7)(OH)2 · 2H2O
21.1.13TangeiteCaCu(VO4)(OH)
21.1.14VésigniéiteBaCu3(VO4)2(OH)2
21.1.15LyonsiteCu3Fe4(VO4)6

Other Names for Blossite

Name in Other Languages:
German:Blossit
Spanish:Blossita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Blossite

Reference List:
Robinson, P. D., Hughes, J. M. and Malinconico, M. L. (1987): Blossite, α-Cu^2[V^2O^7], a new fumarolic sublimate from Izalco volcano, El Salvador. American Mineralogist 72, 397-400.

Calvo, C. and Faggiani, R. (1975): α cupric divanadate. Acta Crystallographica 31, 603-605.

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 68.

Internet Links for Blossite

Localities for Blossite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
El Salvador (TL)
 
  • Sonsonate Department
American Mineralogist (1987) 72, 397-400; HB3 (1997)
Mineral and/or Locality  
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