Griphite Mineral Data

Griphite Mineral Data +

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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.

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

Diaphaniety:

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

Optical Data:

Isotropic, n=1.63-1.687.

Calculated Properties of Griphite

Electron Density:

r_electron=3.56 gm/cc
note: r_Griphite=3.68 gm/cc.

Fermion Index

Fermion Index = 0.00283
Boson Index = 0.99717

Photoelectric:

PE_Griphite= 9.10 barns/electron
U=PE_Griphite x r_electron= 32.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Griphite is Not Radioactive

Griphite Classification

Dana Class:

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

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

(41.9.3)Dana Group

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

Strunz Class:

VII/B.02-10 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.02 - Amblygonite group, Griphite - Tavorite

VII/B.02-10 Griphite Ca(Mn,Na,Li)6FeAl2(PO4)6(F,OH)2 P a3 2/m 3

VII/B.02-20 Tancoite HNa2LiAl(PO4)2(OH) Pbcb 2/m 2/m 2/m

VII/B.02-30 Amblygonite (Li,Na)Al(PO4)(F,OH) P1 1

VII/B.02-40 Montebrasite LiAl(PO4)(OH,F) P1 1

VII/B.02-50 Natromontebrasite (Na,Li)Al(PO4)(OH,F) P1 1

VII/B.02-60 Tavorite LiFe(PO4)(OH) P1 or P1 Tri

Other Griphite Information

References:

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

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Griphite

Ca(Mn,Na,Li)6Fe++Al2(PO4)6(F,OH)2
Dana No: 41.9.3.1 Strunz No: VII/B.02-10
Locality:

Notes: