Mineralogy Database

Schaferite Mineral Data

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General Schaferite Information

Help on Chemical  Formula: Chemical Formula: NaCa2Mg2(VO4)3
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: NaCa2Mg2(VO4)3
Help on Environment: Environment: Found in a silicate-rich xenolith in leucite tephrite lava. The magnesium dominant analogue of palenzonaite. A member of the Garnet group.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Bellberg volcano, near Mayen, Laacher See district, Eifel, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Helmut Sch�fer (b. 1931), amateur mineralogist from Mayen-K�rrenberg, specialist in the minerals of the Eifel volcanic area, who discovered the mineral.
Help on Name Pronunciation: Name Pronunciation: Schaferite + Pronunciation Say SCHAFERITE
Help on Synonym: Synonym: IMA1997-048

Schaferite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 12.427, Z = 8; V = 1,919.11 Den(Calc)= 3.44
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: I a3d
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.779(1), 3.108(0.44), 1.662(0.4),

Physical Properties of Schaferite

Help on Cleavage: Cleavage: None
Help on Color: Color: Red, Orange red.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Octahedral Crystals - Occurs as octahedral shaped crystals.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellow

Optical Properties of Schaferite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.019 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2733,KC= 0.2786
Ncalc = 1.96
Help on Optical Data: Optical Data: Isotropic, n=1.94.

Calculated Properties of Schaferite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.33 gm/cc
note: Specific Gravity of Schaferite =3.44 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PESchaferite = 8.18 barns/electron
U=PESchaferite x rElectron Density= 27.21 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Schaferite is Not Radioactive

Schaferite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.02)(A+ B++)5 (XO4)3
  (38.02.01)Berzeliite Group Berzeliite (Ca,Na)3(Mg,Mn)2(AsO4)3 I a3d 4/m 3 2/m Manganberzeliite (Ca,Na)3(Mn,Mg)2(AsO4)3 I a3d 4/m 3 2/m Palenzonaite (Ca,Na)3Mn(V,As,Si)3O12 I a3d 4/m 3 2/m Schaferite! NaCa2Mg2(VO4)3 I a3d 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 08.AC.25 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AC -With medium-sized and large cations
08.AC.25 Berzeliite (Ca,Na)3(Mg,Mn)2(AsO4)3 I a3d 4/m 3 2/m
08.AC.25 Palenzonaite (Ca,Na)3Mn(V,As,Si)3O12 I a3d 4/m 3 2/m
08.AC.25 Manganberzeliite (Ca,Na)3(Mn,Mg)2(AsO4)3 I a3d 4/m 3 2/m
08.AC.25 Schaferite! NaCa2Mg2(VO4)3 I a3d 4/m 3 2/m

Other Schaferite Information

Help on References: References: NAME( CanMin, 8/99) PHYS. PROP.(AmMin, V 84, p 1687) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Schaferite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Dana No: Strunz No: 08.AC.25





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