Schaferite Mineral Data

Schaferite Mineral Data +

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General Schaferite Information

Chemical Formula:

NaCa2Mg2(VO4)3

Composition:

Molecular Weight = 496.57 gm

Sodium 4.63 % Na 6.24 % Na₂O

Calcium 16.14 % Ca 22.59 % CaO

Magnesium 9.79 % Mg 16.23 % MgO

Vanadium 30.78 % V 54.94 % V₂O₅

Oxygen 38.66 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaCa₂Mg₂(VO₄)₃

Environment:

Found in a silicate-rich xenolith in leucite tephrite lava. The magnesium dominant analogue of palenzonaite. A member of the Garnet group.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Bellberg volcano, near Mayen, Laacher See district, Eifel, Germany. Link to MinDat.org Location Data.

Name Origin:

Named after Helmut Schäfer (b. 1931), amateur mineralogist from Mayen-Kürrenberg, specialist in the minerals of the Eifel volcanic area, who discovered the mineral.

Synonym:

IMA1997-048

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Schaferite Crystallography

Cell Dimensions:

a = 12.427, Z = 8; V = 1,919.11 Den(Calc)= 3.44

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: I a3d

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

By Intensity(I/I_o): 2.779(1), 3.108(0.44), 1.662(0.4),

Physical Properties of Schaferite

Cleavage:

None

Color:

Red, Orange red.

Diaphaniety:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Octahedral Crystals - Occurs as octahedral shaped crystals.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

yellow

Optical Properties of Schaferite

Gladstone-Dale:

CI calc= 0.019 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2733,KC= 0.2786

Optical Data:

Isotropic, n=1.94.

Calculated Properties of Schaferite

Electron Density:

r_electron=3.33 gm/cc
note: r_Schaferite=3.44 gm/cc.

Fermion Index

Fermion Index = 0.01096
Boson Index = 0.98904

Photoelectric:

PE_Schaferite= 8.18 barns/electron
U=PE_Schaferite x r_electron= 27.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Schaferite is Not Radioactive

Schaferite Classification

Dana Class:

38.2.1.4 (38)Anhydrous Phosphates, etc

(38.2)(A+ B++)5 (XO4)3

(38.2.1)Dana Group

38.2.1.1 Berzeliite (Ca,Na)3(Mg,Mn)2(AsO4)3 I a3d 4/m 3 2/m

38.2.1.2 Manganberzeliite (Ca,Na)3(Mn,Mg)2(AsO4)3 I a3d 4/m 3 2/m

38.2.1.3 Palenzonaite (Ca,Na)3Mn(V,As,Si)3O12 I a3d 4/m 3 2/m

38.2.1.4 Schaferite ! NaCa2Mg2(VO4)3 I a3d 4/m 3 2/m

Strunz Class:

VII/A.08-45 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of medium and big size: Mg, Mn,Fe, Cu, Zn, and Ca, Na

VII/A.08 - Chladniite - Berzeliite - Palenzonaite series

VII/A.08-03 Galileiite! NaFe4(PO4)3 R 3 3

VII/A.08-05 Chladniite Na2Ca(Mg,Fe)7(PO4)6 R 3 3

VII/A.08-10 Johnsomervilleite Na2Ca(Mg,Fe,Mn)7(PO4)6 R 3 3

VII/A.08-20 Fillowite Na2Ca(Mn,Fe)7(PO4)6 R 3 3

VII/A.08-30 Berzeliite (Ca,Na)3(Mg,Mn)2(AsO4)3 I a3d 4/m 3 2/m

VII/A.08-40 Manganberzeliite (Ca,Na)3(Mn,Mg)2(AsO4)3 I a3d 4/m 3 2/m

VII/A.08-45 Schaferite NaCa2Mg2(VO4)3 I a3d 4/m 3 2/m

VII/A.08-50 Palenzonaite (Ca,Na)3Mn(V,As,Si)3O12 I a3d 4/m 3 2/m

Other Schaferite Information

References:

NAME( CanMin, 8/99) PHYS. PROP.(AmMin, V 84, p 1687) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Schaferite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Schaferite

NaCa2Mg2(VO4)3
Dana No: 38.2.1.4 Strunz No: VII/A.08-45
Locality:

Notes: