Anatase Mineral Data

Anatase Mineral Data +

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General Anatase Information

Chemical Formula:

TiO2

Composition:

Molecular Weight = 79.88 gm

Titanium 59.94 % Ti 100.00 % TiO₂

Oxygen 40.06 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

TiO₂

Environment:

Usually secondary, derived from other Ti-bearing minerals. Common as a detrital mineral.

IMA Status:

Valid Species (Pre-IMA) 1801

Locality:

St. Christophe, Bourg-d'Oisans, Isère, France. Link to MinDat.org Location Data.

Name Origin:

From the Greek, anatasis - "elongation."

Synonym:

ICSD 9852

Octahedrite

PDF 21-1272

Anatase Image

Images:

Anatase

Comments: anatase with calcite.
Location: Hardangervidda, Norway, (1999). Scale: 1.5 x 3 cm.
© Fabre Minerals

Anatase Crystallography

Axial Ratios:

a:c = 1:2.50725

Cell Dimensions:

a = 3.793, c = 9.51, Z = 4; V = 136.82 Den(Calc)= 3.88

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/amd

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

By Intensity(I/I_o): 3.51(1), 1.891(0.33), 2.379(0.22),

Forms:

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Forms: [ 1 1 1]

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Crystal Structure:

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Horn M , Schwerdtfeger C F , Meagher E P , Zeitschrift fur Kristallographie , 136 (1972) p.273-281, Refinement of the structure of anatase at several temperatures, Sample: T = 25 C, Locality: Legenbach quarry, Binnatal, Switzerland

View Additional jPOWD Structure files for Anatase
[1] [2] [3] [4]

Physical Properties of Anatase

Cleavage:

[101] Perfect, [001] Distinct

Color:

Black, Reddish brown, Yellowish brown, Dark blue, Gray.

Density:

3.9

Diaphaniety:

Transparent to translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Pyramidal - Crystals are shaped like pyramids.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luminescence:

None.

Luster:

Adamantine - Resinous

Streak:

pale yellowish white

Optical Properties of Anatase

Dichroism (e):

slate blue.

Dichroism (w):

slate blue.

Gladstone-Dale:

CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3929,KPDmeas= 0.3909,KC= 0.393

Optical Data:

Uniaxial (-), e=2.488, w=2.561, bire=0.0730.

RL Pleochroism:

Weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Anatase in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	23.70	23.80
420 nm	22.40	22.50
440 nm	21.70	21.60
460 nm	21.10	21.00
480 nm	20.70	20.40
500 nm	20.20	20.00
520 nm	19.90	19.60
540 nm	19.60	19.30
560 nm	19.40	19.00
580 nm	19.20	18.80
600 nm	19.00	18.50
620 nm	18.80	18.40
640 nm	18.70	18.20
660 nm	18.60	18.10
680 nm	18.50	18.00
700 nm	18.40	17.80

**Calculated Relative Intensity Colors of Anatase in Air**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	450%	470%
R₁
R₂

Calculated Properties of Anatase

Electron Density:

r_electron=3.69 gm/cc
note: r_Anatase=3.88 gm/cc.

Fermion Index

Fermion Index = 0.07769
Boson Index = 0.92231

Photoelectric:

PE_Anatase= 10.03 barns/electron
U=PE_Anatase x r_electron= 37.04 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Anatase is Not Radioactive

Anatase Classification

Dana Class:

4.4.4.1 (4)Simple Oxides

(4.4)with a cation charge of 4+ (A++++ O2)

(4.4.4)Dana Group

4.4.4.1 Anatase TiO2 I 4₁/amd 4/m 2/m 2/m

Strunz Class:

IV/D.14-10 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.14 - Anatase - Downeyite series

IV/D.14-10 Anatase TiO2 I 4₁/amd 4/m 2/m 2/m

IV/D.14-20 Downeyite SeO2 P 4/mbc 4/m 2/m 2/m

Other Anatase Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

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Anatase

TiO2
Dana No: 4.4.4.1 Strunz No: IV/D.14-10
Locality:

Notes: