Dreyerite Mineral Data

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General Dreyerite Information

Chemical Formula:

BiVO4

Composition:

Molecular Weight = 323.92 gm

Vanadium 15.73 % V 28.07 % V₂O₅

Bismuth 64.52 % Bi 71.93 % Bi₂O₃

Oxygen 19.76 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Bi(VO₄)

Environment:

Rhyolitic tuffs, intercalated with carbonaceous matter and silicified wood.

IMA Status:

Approved IMA 1981

Locality:

Hirschhorn, near Kaiserlautern, Rhineland-Palatinate, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Gerhard Dreyer, Assistant Professor, Johannes Gutenberg University, Mainz, Germany, who found the mineral.

Name Pronunciation:

Dreyerite + Pronunciation

Synonym:

ICSD 100733

PDF 14-133

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Dreyerite Crystallography

Axial Ratios:

a:c = 1:0.88429

Cell Dimensions:

a = 7.303, c = 6.458, Z = 4; V = 344.43 Den(Calc)= 6.25

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/amd

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

By Intensity(I/I_o): 3.656(1), 2.739(0.6), 4.85(0.4),

Crystal Structure:

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Dreyer G , Tillmanns E , Neues Jahrbuch fur Mineralogie, Monatshefte , 1981 (1981) p.151-154, Dreyerite: ein naturliches, tetragonales wismutvanadat von Hirschhorn/Pfalz, Locality: Hirschhorn, Pfalz, Germany

Physical Properties of Dreyerite

Color:

Brownish yellow, Orange.

Density:

6.25

Diaphaneity:

Semitransparent

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2-3 - Gypsum-Calcite

Luster:

Adamantine

Streak:

yellow

Optical Properties of Dreyerite

Dichroism (e):

bright yellow.

Dichroism (w):

brownish yellow.

Gladstone-Dale:

CI meas= 0.221 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.221 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.16,KPDmeas= 0.16,KC= 0.2055
Ncalc = 2.28

Optical Data:

Uniaxial (+), w=2, e=2, bire=0.0000.

Calculated Properties of Dreyerite

Electron Density:

Bulk Density (Electron Density)=5.33 gm/cc
note: Specific Gravity of Dreyerite =6.25 gm/cc.

Fermion Index:

Fermion Index = 0.0004886448
Boson Index = 0.9995113552

Photoelectric:

PE_Dreyerite=1,221.91 barns/electron
U=PE_Dreyerite x rElectron Density=6,507.18 barns/cc.

Radioactivity:

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

Dreyerite Classification

Dana Class:

38.04.08.01 (38)Anhydrous Phosphates, etc

(38.04)A+ XO4

(38.04.08)Dana Group

38.04.08.01 Dreyerite BiVO4 I 4₁/amd 4/m 2/m 2/m

Strunz Class:

08.AD.35 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AD -With only large cations

08.AD.35 Dreyerite BiVO4 I 4₁/amd 4/m 2/m 2/m

08.AD.35 Chernovite-(Y) YAsO4 I 4₁/amd 4/m 2/m 2/m

08.AD.35 Pretulite! ScPO4 I 4₁/amd 4/m 2/m 2/m

08.AD.35 Xenotime-(Y) YPO4 I 4₁/amd 4/m 2/m 2/m

08.AD.35 Wakefieldite-(Ce) (Ce,Pb,Pb)VO4 I 4₁/amd 4/m 2/m 2/m

08.AD.35 Wakefieldite-(Y) YVO4 I 4₁/amd 4/m 2/m 2/m

08.AD.35 Xenotime-(Yb)! YbPO4 I 4₁/amd 4/m 2/m 2/m

08.AD.35 Wakefieldite-(La)! LaVO4 I 4₁/amd 4mm

08.AD.35 Wakefieldite-(Nd)! NdVO4 I 4₁/amd 4mm

Other Dreyerite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic5)

See Also:

Links to other databases for Dreyerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Dreyerite Specimen Label here :

Dreyerite

BiVO4
Dana No: 38.04.08.01 Strunz No: 08.AD.35
Locality:

Notes: