Ecandrewsite Mineral Data

Ecandrewsite Mineral Data +

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General Ecandrewsite Information

Chemical Formula:

(Zn,Fe++,Mn++)TiO3

Composition:

Molecular Weight = 157.27 gm

Titanium 30.44 % Ti 50.79 % TiO₂

Manganese 6.99 % Mn 9.02 % MnO

Zinc 24.95 % Zn 31.05 % ZnO

Iron 7.10 % Fe 9.14 % FeO

Oxygen 30.52 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn_0.6Fe²⁺_0.2Mn²⁺_0.2TiO₃

Environment:

In quartz-rich metasediments of the amphibolite-granulite facies.

IMA Status:

Approved IMA 1988

Locality:

Melbourne Rockwell mine, Little Broken Hill, New South Wales, Australia. Link to MinDat.org Location Data.

Name Origin:

Named for Ernest Clayton Andrews (1870-1948), New South Wales government geologist, who mapped the Broken Hill Region.

Synonym:

ICSD 22382

PDF 26-1500

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Ecandrewsite Crystallography

Axial Ratios:

a:c = 1:2.75756

Cell Dimensions:

a = 5.09, c = 14.036, Z = 6; V = 314.93 Den(Calc)= 4.98

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

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

By Intensity(I/I_o): 2.73(1), 2.53(0.9), 1.71(0.7),

Crystal Structure:

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Mitchell R H , Liferovich R P , The Canadian Mineralogist , 42 (2004) p.1871-1880, The pyrophanite-ecandrewsite solid-solution: crystal structures, of the Mn1-xZnxSiO3 series (0.1 <= x <= 0.8), Sample: x = .7, ilmenite structure

View Additional jPOWD Structure files for Ecandrewsite
[1]

Physical Properties of Ecandrewsite

Cleavage:

None

Color:

Brownish black, Dark brown, Black.

Diaphaniety:

Opaque

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5-5.5 - Apatite-Knife Blade

Luster:

Sub Metallic

Streak:

brown black

Optical Properties of Ecandrewsite

Dichroism (e):

deep orange brown.

Dichroism (w):

deep orange brown.

Optical Data:

Uniaxial (+).

NCalc= 2.41 - from Gladstone-Dale relationship (KC = 0.2836) where Ncalc=Dcalc*KC+1

RL Anisotrophism:

Strong, greenish gray to black.

RL Color:

Grayish white with a pinkish tint.

RL Pleochroism:

Weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Ecandrewsite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	17.20	19.90
546 nm	17.20	19.70
589 nm	17.00	19.60
650 nm	16.80	19.20

**Calculated Relative Intensity Colors of Ecandrewsite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	520%
R₁
R₂

Calculated Properties of Ecandrewsite

Electron Density:

r_electron=4.70 gm/cc
note: r_Ecandrewsite=4.98 gm/cc.

Fermion Index

Fermion Index = 0.05124
Boson Index = 0.94876

Photoelectric:

PE_Ecandrewsite= 21.78 barns/electron
U=PE_Ecandrewsite x r_electron= 102.35 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ecandrewsite is Not Radioactive

Ecandrewsite Classification

Dana Class:

4.3.5.4 (4)Simple Oxides

(4.3)with a cation charge of 3+ (A+++2 O3)

(4.3.5)Dana Group

4.3.5.1 Ilmenite FeTiO3 R 3 3

4.3.5.2 Geikielite MgTiO3 R 3 3

4.3.5.3 Pyrophanite MnTiO3 R 3 3

4.3.5.4 Ecandrewsite (Zn,Fe,Mn)TiO3 R 3 3

4.3.5.5 Melanostibite Mn(Sb,Fe)O3 R 3 3

4.3.5.6 Brizziite-III NaSbO3 R 3 3

4.3.5.7 Akimotoite! (Mg,Fe)SiO3 R 3 3

Strunz Class:

IV/C.05-40 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.05 - Ilmenite group, Geikilith - Brizziite series

IV/C.05-05 Akimotoite! (Mg,Fe)SiO3 R 3 3

IV/C.05-10 Geikielite MgTiO3 R 3 3

IV/C.05-20 Ilmenite FeTiO3 R 3 3

IV/C.05-30 Pyrophanite MnTiO3 R 3 3

IV/C.05-40 Ecandrewsite (Zn,Fe,Mn)TiO3 R 3 3

IV/C.05-50 Melanostibite Mn(Sb,Fe)O3 R 3 3

IV/C.05-60 Brizziite-III NaSbO3 R 3 3

IV/C.05-60* Brizziite-VII NaSbO3 R 3 3

Other Ecandrewsite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Am.Min.,Vol.74,p501,1989) OPTIC PROP.(AntBidBlaNic3)

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Ecandrewsite

(Zn,Fe++,Mn++)TiO3
Dana No: 4.3.5.4 Strunz No: IV/C.05-40
Locality:

Notes: