Tavorite Mineral Data

General Tavorite Information

Chemical Formula:

LiFe+++(PO4)(OH)

Composition:

Molecular Weight = 174.77 gm

Lithium 3.97 % Li 8.55 % Li₂O

Iron 31.96 % Fe 45.69 % Fe₂O₃

Phosphorus 17.72 % P 40.61 % P₂O₅

Hydrogen 0.58 % H 5.15 % H₂O

Oxygen 45.77 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

LiFe³⁺(PO₄)(OH)

Environment:

Lithium-bearing pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

Sapucaia pegmatite, Galileia, Minas Gerias, Brazil. Link to MinDat.org Location Data.

Name Origin:

Named for Elysairio Tavora (1911-), mineralogist, University of Brazil, Rio de Janerio, Brazil.

Name Pronunciation:

Tavorite

Synonym:

ICSD 20808

PDF 41-1376

Tavorite Image

Images:

Tavorite

Comments: Tabular, prismatic crystals of tavorite on matrix.
Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Tavorite Hureaulite

Comments: Lime green tavorite micro crystals with pink, gemmy hureaulite.
Location: Tip Top mine, Custer Co., South Dakota, United States. Scale: Picture size 1.0 cm.
© Tom Loomis / Dakota Matrix

Tavorite Crystallography

Axial Ratios:

a:b:c =0.9681:1:1.4022

Cell Dimensions:

a = 5.138, b = 5.307, c = 7.442, Z = 2; alpha = 67.48°, beta = 67.72°, gamma = 81.98° V = 171.76 Den(Calc)= 3.38

Crystal System:

TriclinicSpace Group: P1 or P1

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

By Intensity(I/I_o): 3.045(1), 3.285(0.9), 4.99(0.5),

Crystal Structure:

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Yakubovich O V , Urusov V S , Geochemistry International , 35 (1997) p.630-638, The structure and electron density of Fe2+ -bearing tavorite in relation to the, genetic crystal chemistry of secondary phosphates of lithium pegmatites, Locality: synthetic

Physical Properties of Tavorite

Cleavage:

{???} Distinct, {???} Distinct, {???} Distinct

Color:

Grass green, Greenish yellow, Yellow green, Yellow.

Density:

3.288

Diaphaneity:

Transparent to Translucent

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

light green

Optical Properties of Tavorite

Gladstone-Dale:

CI meas= 0.056 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.073 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2428,KPDmeas= 0.2474,KC= 0.262
Ncalc = 1.86 - 1.88

Optical Data:

Biaxial (+), a=1.795, b=1.81, g=1.835, bire=0.0400, 2V(Calc)=78, 2V(Meas)=74.

Calculated Properties of Tavorite

Electron Density:

Bulk Density (Electron Density)=3.20 gm/cc
note: Specific Gravity of Tavorite =3.29 gm/cc.

Fermion Index:

Fermion Index = 0.0099737601
Boson Index = 0.9900262399

Photoelectric:

PE_Tavorite= 10.46 barns/electron
U=PE_Tavorite x rElectron Density= 33.45 barns/cc.

Radioactivity:

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

Tavorite Classification

Dana Class:

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

(41.05)where (A B)2 (XO4) Zq

(41.05.09)Dana Group

41.05.09.01 Tavorite LiFe(PO4)(OH) P1 or P1 Tri

Strunz Class:

08.BB.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BB -With only medium-sized cations, (OH, etc.):RO4 £ 1:1

08.BB.05 Amblygonite (Li,Na)Al(PO4)(F,OH) P1 1

08.BB.05 Natromontebrasite? (Na,Li)Al(PO4)(OH,F) P1 1

08.BB.05 Montebrasite? LiAl(PO4)(OH,F) P1 1

08.BB.05 Tavorite LiFe(PO4)(OH) P1 or P1 Tri

Other Tavorite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Tavorite :
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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Ask about Tavorite here :
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Print or Cut-and-Paste your Tavorite Specimen Label here :

Tavorite

LiFe+++(PO4)(OH)
Dana No: 41.05.09.01 Strunz No: 08.BB.05
Locality:

Notes: