Tavorite Mineral Data

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.

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),

Physical Properties of Tavorite

Cleavage:

[???] Distinct, [???] Distinct, [???] Distinct

Color:

Grass green, Greenish yellow, Yellow green, Yellow.

Density:

3.288

Diaphaniety:

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= 0.082 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2406,KPDmeas= 0.2474,KC= 0.262

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:

r_electron=3.20 gm/cc
note: r_Tavorite=3.29 gm/cc.

Fermion Index

Fermion Index = 0.00997
Boson Index = 0.99003

Photoelectric:

PE_Tavorite= 10.46 barns/electron
U=PE_Tavorite x r_electron= 33.45 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tavorite is Not Radioactive

Tavorite Classification

Dana Class:

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

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

(41.5.9)Dana Group

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

Strunz Class:

VII/B.02-60 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 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Tavorite

LiFe+++(PO4)(OH)
Dana No: 41.5.9.1 Strunz No: VII/B.02-60
Locality:

Notes: