Vanadomalayaite Mineral Data

Vanadomalayaite Mineral Data +

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General Vanadomalayaite Information

Chemical Formula:

CaVOSiO4

Composition:

Molecular Weight = 199.10 gm

Calcium 20.13 % Ca 28.17 % CaO

Vanadium 25.59 % V 45.68 % V₂O₅

Silicon 14.11 % Si 30.18 % SiO₂

Oxygen 40.18 % O

______ ______

100.00 % 104.02 % = TOTAL OXIDE

Empirical Formula:

CaV⁵⁺SiO₅

Environment:

Associated with calcite, quartz and haradaite in a small vein cutting ophiolitic metacherts.

IMA Status:

Approved IMA 1994

Locality:

Gambatesa mine, near Reppia, Val Graveglia, northern Apennines, Italy. Link to MinDat.org Location Data.

Name Origin:

Named to show it's chemical relationship to malayaite.

Synonym:

ICSD 75619

IMA1993-032

PDF 47-1772

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Vanadomalayaite Crystallography

Axial Ratios:

a:b:c =0.7508:1:0.8091

Cell Dimensions:

a = 6.526, b = 8.691, c = 7.032, Z = 4; beta = 113.146° V = 366.73 Den(Calc)= 3.61

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 3.22(1), 2.97(0.7), 2.59(0.63),

Crystal Structure:

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Basso R , Lucchetti G , Zefiro L , Palenzona A , Neues Jahrbuch fur Mineralogie, Monatshefte , 1994 (1994) p.489-498, Vanadomalayaite, CaVOSiO4, a new mineral vanadium analog of titanite and malayaite, Locality: Gambatesa mine, Reppia, Val Graveglia, Northern Appenines, Italy

Physical Properties of Vanadomalayaite

Cleavage:

[110] Good

Color:

Deep red.

Density:

3.6

Diaphaniety:

Transparent

Fracture:

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

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

6 - Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Adamantine

Streak:

red

Optical Properties of Vanadomalayaite

Gladstone-Dale:

CI meas= -0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2846,KPDmeas= 0.2854,KC= 0.2772

Optical Data:

Biaxial (+), a=1.95, g=2.105, bire=0.1550, 2V(Meas)=17-40.

Pleochroism (x):

brownish red-orange.

Pleochroism (y):

brownish red-orange.

Pleochroism (z):

deep greenish blue.

Calculated Properties of Vanadomalayaite

Electron Density:

r_electron=3.52 gm/cc
note: r_{Vanadomalayaite}=3.61 gm/cc.

Fermion Index

Fermion Index = 0.00769
Boson Index = 0.99231

Photoelectric:

PE_{Vanadomalayaite}= 7.89 barns/electron
U=PE_{Vanadomalayaite} x r_electron= 27.74 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Vanadomalayaite is Not Radioactive

Vanadomalayaite Classification

Dana Class:

52.4.3.3 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.4)with cations in [6] and/or > [6] coordination

(52.4.3)Titanite group

52.4.3.1 Titanite CaTiSiO5 P 2₁/a 2/m

52.4.3.2 Malayaite CaSnSiO5=CaSnOSiO4 A2/a 2/m

52.4.3.3 Vanadomalayaite CaVOSiO4 C 2/c 2/m

Strunz Class:

VIII/B.12-15 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.12 - Titanite series

VIII/B.12-10 Titanite CaTiSiO5 P 2₁/a 2/m

VIII/B.12-15 Vanadomalayaite CaVOSiO4 C 2/c 2/m

VIII/B.12-20 Malayaite CaSnSiO5=CaSnOSiO4 A2/a 2/m

VIII/B.12-30 Trimounsite-(Y) (Y,REE)2Ti2SiO9 P 2₁/c 2/m

Other Vanadomalayaite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.80,p1075,1995) OPTIC PROP.(Am.Min.,Vol.80,p1075,1995)

See Also:

Links to other databases for Vanadomalayaite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Vanadomalayaite

CaVOSiO4
Dana No: 52.4.3.3 Strunz No: VIII/B.12-15
Locality:

Notes: