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Griphite Mineral Data

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General Griphite Information

Help on Chemical  Formula: Chemical Formula: Ca(Mn,Na,Li)6Fe++Al2(PO4)6(F,OH)2
Help on Composition: Composition: Molecular Weight = 1,007.43 gm
   Sodium       2.51 %  Na    3.38 % Na2O
   Lithium      0.48 %  Li    1.04 % Li2O
   Calcium      3.98 %  Ca    5.57 % CaO
   Manganese   16.91 %  Mn   21.83 % MnO
   Aluminum     5.09 %  Al    9.61 % Al2O3
   Iron        10.53 %  Fe    7.84 % FeO /  6.34 % Fe2O3
   Phosphorus  18.45 %  P    42.27 % P2O5
   Hydrogen     0.01 %  H     0.09 % H2O
   Oxygen      38.27 %  O
   Fluorine     3.77 %  F     3.77 % F
                 -   %   F    -1.59 % -O=F2    
              ______        ______ 
              100.00 %      100.16 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaMn2+3.1Na1.1Fe2+1.1Li0.7Fe3+0.8Al1.9(PO4)6F2(OH)0.1
Help on Environment: Environment: Accessory mineral in complex granite pegmatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1891
Help on Locality: Locality: Riverton Lode (Everly mine), near Harney City, 3 km east of Keystone, Penninton County, South Dakota, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for "enigma", as the chemical composition was originally puzzling.
Help on Name Pronunciation: Name Pronunciation: Griphite Say GRIPHITE
Help on Synonym: Synonym: ICSD 34119
  PDF 42-1351

Griphite Image

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Comments: Dark red-brown vitreous crystalline massive griphite.
Location: Sitting Bull Mine, Pennington County, South Dakota, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Griphite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 12.205, Z = 4; V = 1,818.08 Den(Calc)= 3.68
Help on Crystal System: Crystal System: Isometric - Diploidal H-M Symbol (2/m 3) Space Group: P a3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.75(1), 2(0.3), 2.98(0.3),

Physical Properties of Griphite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brownish black, Yellow, Dark brown.
Help on Density: Density: 3.4
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Amorphous - No crystalline form or imitative shape.
Help on Habit: Habit: Reniform - "Kidney like" in shape (e.g.. hematite).
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Resinous

Optical Properties of Griphite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.024 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.098 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1789,KPDmeas= 0.1937,KC= 0.1983
Ncalc = 1.67 - 1.73
Help on Optical Data: Optical Data: Isotropic, n=1.63-1.687.

Calculated Properties of Griphite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.29 gm/cc
note: Specific Gravity of Griphite =3.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0028320694
Boson Index = 0.9971679306
Help on Photoelectric: Photoelectric: PEGriphite = 9.10 barns/electron
U=PEGriphite x rElectron Density= 29.88 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Griphite is Not Radioactive

Griphite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.09)where (A B)5 (XO4)3 Zq
  (41.09.03)Dana Group Griphite Ca(Mn,Na,Li)6FeAl2(PO4)6(F,OH)2 P a3 2/m 3
Help on  Strunz Class: Strunz Class: 08.BF.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BF -With medium-sized and large cations, (OH, etc.):RO4 < 0.5:1
08.BF.15 Griphite Ca(Mn,Na,Li)6FeAl2(PO4)6(F,OH)2 P a3 2/m 3

Other Griphite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: See Also: Links to other databases for Griphite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.BF.15





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