Griphite Mineral Data

General Griphite Information

Chemical Formula:

Ca(Mn,Na,Li)6Fe++Al2(PO4)6(F,OH)2

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

Empirical Formula:

CaMn²⁺_3.1Na_1.1Fe²⁺_1.1Li_0.7Fe³⁺_0.8Al_1.9(PO₄)₆F₂(OH)_0.1

Environment:

Accessory mineral in complex granite pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1891

Locality:

Riverton Lode (Everly mine), near Harney City, 3 km east of Keystone, Penninton County, South Dakota, USA. Link to MinDat.org Location Data.

Name Origin:

From the Greek for "enigma", as the chemical composition was originally puzzling.

Name Pronunciation:

Griphite

Synonym:

ICSD 34119

PDF 42-1351

Griphite Image

Images:

Griphite

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

Cell Dimensions:

a = 12.205, Z = 4; V = 1,818.08 Den(Calc)= 3.68

Crystal System:

Isometric - DiploidalH-M Symbol (2/m 3) Space Group: P a3

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

By Intensity(I/I_o): 2.75(1), 2(0.3), 2.98(0.3),

Crystal Structure:

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Rinaldi R , Bulletin de Mineralogie , 101 (1978) p.543-547, The crystal structure of griphite, a complex phosphate, not a garnetoid, Locality: Alberes, East Pyrenees, France

Physical Properties of Griphite

Cleavage:

None

Color:

Brownish black, Yellow, Dark brown.

Density:

3.4

Diaphaneity:

Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Amorphous - No crystalline form or imitative shape.

Habit:

Reniform - "Kidney like" in shape (e.g.. hematite).

Hardness:

5.5 - Knife Blade

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Resinous

Optical Properties of Griphite

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

Optical Data:

Isotropic, n=1.63-1.687.

Calculated Properties of Griphite

Electron Density:

Bulk Density (Electron Density)=3.29 gm/cc
note: Specific Gravity of Griphite =3.40 gm/cc.

Fermion Index:

Fermion Index = 0.0028320694
Boson Index = 0.9971679306

Photoelectric:

PE_Griphite= 9.10 barns/electron
U=PE_Griphite x rElectron Density= 29.88 barns/cc.

Radioactivity:

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

Griphite Classification

Dana Class:

41.09.03.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.09)where (A B)5 (XO4)3 Zq

(41.09.03)Dana Group

41.09.03.01 Griphite Ca(Mn,Na,Li)6FeAl2(PO4)6(F,OH)2 P a3 2/m 3

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

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

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
15 - WWW-MINCRYST

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

Griphite

Ca(Mn,Na,Li)6Fe++Al2(PO4)6(F,OH)2
Dana No: 41.09.03.01 Strunz No: 08.BF.15
Locality:

Notes: