Mineralogy Database

Theophrastite Mineral Data

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General Theophrastite Information

Help on Chemical  Formula: Chemical Formula: Ni(OH)2
Help on Composition: Composition: Molecular Weight = 92.70 gm
   Nickel    63.31 %  Ni   80.57 % NiO
   Hydrogen   2.17 %  H    19.43 % H2O
   Oxygen    34.52 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ni(OH)2
Help on Environment: Environment: Coatings in chromitite in lenses in serpentinites (
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Verrnion district, 50 km west of Thessalonike, Macedonia, Greece. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Theophrastus, (ca. 371 BC-ca. 287 BC), the first Greek mineralogist.
Help on Name Pronunciation: Name Pronunciation: Theophrastite + Pronunciation Say THEOPHRASTITE
Help on Synonym: Synonym: ICSD 28101
  PDF 14-117

Theophrastite Image

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  Theophrastite   Chromite

Comments: Green pearly scaly theophrastite coatings on massive dark chromite.
Location: Vermion Region, near Thessaloniki, Kedriki Makedhonia, Greece. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Theophrastite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.47173
Help on Cell Dimensions: Cell Dimensions: a = 3.131, c = 4.608, Z = 1; V = 39.12 Den(Calc)= 3.93
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3m1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.335(1), 4.61(0.95), 1.755(0.5),

Physical Properties of Theophrastite

Help on Color: Color: Emerald green.
Help on Density: Density: 4
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light green

Optical Properties of Theophrastite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.087 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.07 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1933,KPDmeas= 0.1899,KC= 0.2079
Ncalc = 1.82 - 1.83
Help on Optical Data: Optical Data: Uniaxial (+), w=1.759-1.76, e=1.759-1.76, bire=0.0000.

Calculated Properties of Theophrastite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.90 gm/cc
note: Specific Gravity of Theophrastite =3.93 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0073228105
Boson Index = 0.9926771895
Help on Photoelectric: Photoelectric: PETheophrastite = 24.82 barns/electron
U=PETheophrastite x rElectron Density= 96.81 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Theophrastite is Not Radioactive

Theophrastite Classification

Help on  Dana Class: Dana Class: (06)Hydroxides and Oxides Containing Hydroxyl
  (06.02)where X++ (OH)2
  (06.02.01)Brucite group (Rhombohedral: P-3m1) Brucite Mg(OH)2 P 3m1 3 2/m Amakinite (Fe,Mg)(OH)2 P 3m1 3 2/m Pyrochroite Mn(OH)2 P 3m1 3 2/m Portlandite Ca(OH)2 P 3m1 3 2/m Theophrastite Ni(OH)2 P 3m1 3 2/m
Help on  Strunz Class: Strunz Class: 04.FE.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FE -Hydroxides with OH, without H2O; sheets of edge-sharing octahedra
04.FE.05 Amakinite (Fe,Mg)(OH)2 P 3m1 3 2/m
04.FE.05 Brucite Mg(OH)2 P 3m1 3 2/m
04.FE.05 Portlandite Ca(OH)2 P 3m1 3 2/m
04.FE.05 Pyrochroite Mn(OH)2 P 3m1 3 2/m
04.FE.05 Theophrastite Ni(OH)2 P 3m1 3 2/m
04.FE.05 Fougerite! (Fe,Mg)6Fe2(OH)18•4(H2O) R 3m 3 2/m

Other Theophrastite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Theophrastite :
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 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 04.FE.05





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