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Ecandrewsite Mineral Data
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General Ecandrewsite Information
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 Chemical Formula: |
(Zn,Fe++,Mn++)TiO3 |
| Composition: |
Molecular Weight = 157.27 gm |
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Titanium 30.44 % Ti 50.79 % TiO2 |
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Manganese 6.99 % Mn 9.02 % MnO |
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Zinc 24.95 % Zn 31.05 % ZnO |
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Iron 7.10 % Fe 9.14 % FeO |
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Oxygen 30.52 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Zn0.6Fe2+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. |
| Name Pronunciation: |
Ecandrewsite + Pronunciation  |
| Synonym: |
ICSD 22382 |
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PDF 26-1500 |
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Ecandrewsite Crystallography
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| 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 - Rhombohedral H-M Symbol ( 3) Space Group: R 3 |
| X Ray Diffraction: |
By Intensity(I/Io): 2.73(1), 2.53(0.9), 1.71(0.7), |
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Physical Properties of Ecandrewsite
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| Cleavage: |
None |
| Color: |
Brownish black, Dark brown, Black. |
| Diaphaneity: |
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 |
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Optical Properties of Ecandrewsite
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| Dichroism (e): |
deep orange brown. |
| Dichroism (w): |
deep orange brown. |
| Optical Data: |
Uniaxial (+). |
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NCalc= 2.41 - from Gladstone-Dale relationship (KC = 0.2836) where Ncalc=Dcalc*KC+1
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| 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 |
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∑ R1(λ) |
∑ R2(λ) |
| 470 nm |
17.20 |
19.90 |
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| 546 nm |
17.20 |
19.70 |
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| 589 nm |
17.00 |
19.60 |
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| 650 nm |
16.80 |
19.20 |
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Calculated Relative Intensity Colors of Ecandrewsite in Air
Relative
Intensity |
0% |
60% |
100% |
120% |
180% |
240% |
300% |
360% |
420% |
480% |
520% |
| R1 |
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| R2 |
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Calculated Properties of Ecandrewsite
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| Electron Density: |
Bulk Density (Electron Density)=4.70 gm/cc
note: Specific Gravity of Ecandrewsite =4.98 gm/cc.
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| Fermion Index: |
Fermion Index = 0.05
Boson Index = 0.95 |
| Photoelectric: |
PEEcandrewsite = 21.78 barns/electron
U=PEEcandrewsite x rElectron Density= 102.35 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ecandrewsite is Not Radioactive |
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Ecandrewsite Classification
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| Dana Class: |
04.03.05.04 (04)Simple Oxides |
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(04.03)with a cation charge of 3+ (A+++2 O3) |
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(04.03.05)Ilmenite Group |
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04.03.05.01 Ilmenite FeTiO3 R 3 3 |
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04.03.05.02 Geikielite MgTiO3 R 3 3 |
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04.03.05.03 Pyrophanite MnTiO3 R 3 3 |
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04.03.05.04 Ecandrewsite (Zn,Fe,Mn)TiO3 R 3 3 |
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04.03.05.05 Melanostibite Mn(Sb,Fe)O3 R 3 3 |
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04.03.05.06 Brizziite-III NaSbO3 R 3 3 |
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04.03.05.07 Akimotoite! (Mg,Fe)SiO3 R 3 3 |
| Strunz Class: |
04.CB.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.C - Metal:Oxygen = 2:3, 3:5, and Similar |
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04.CB -With medium-sized cations |
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04.CB.05 Auroantimonate* AuSbO3 Ortho ? Ortho |
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04.CB.05 Geikielite MgTiO3 R 3 3 |
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04.CB.05 Brizziite-III NaSbO3 R 3 3 |
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04.CB.05 Brizziite-VII NaSbO3 R 3 3 |
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04.CB.05 Ecandrewsite (Zn,Fe,Mn)TiO3 R 3 3 |
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04.CB.05 Corundum Al2O3 R 3c 3 2/m |
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04.CB.05 Eskolaite Cr2O3 R 3c 3 2/m |
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04.CB.05 Hematite Fe2O3 R 3c 3 2/m |
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04.CB.05 Karelianite V2O3 R 3c 3 2/m |
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04.CB.05 Ilmenite FeTiO3 R 3 3 |
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04.CB.05 Melanostibite Mn(Sb,Fe)O3 R 3 3 |
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04.CB.05 Pyrophanite MnTiO3 R 3 3 |
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04.CB.05 Romanite* (Fe,U,Pb)2(Ti,Fe)O4 Trig ? Trig |
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04.CB.05 Tistarite! Ti2O3 R 3c 3 2/m |
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Other Ecandrewsite Information
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| References: |
NAME( AntBidBlaNic3) PHYS. PROP.(Am.Min.,Vol.74,p501,1989) OPTIC PROP.(AntBidBlaNic3) |
| See Also: |
Links to other databases for Ecandrewsite :
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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Print or Cut-and-Paste your Ecandrewsite Specimen Label here :
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Ecandrewsite
(Zn,Fe++,Mn++)TiO3
Dana No: 04.03.05.04 Strunz No: 04.CB.05
Locality:
Notes:
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