Theophrastite Mineral Data

Advertisment

Weinrich Minerals, A Dealer in Fine Mineral Specimens - Since 1989. We buy collections and single high quality specimens.

Our Mission is Simple: RMS will be the go-to portal for all mineral, gem and rock shows in the USA

John Betts - Fine Minerals, New York. Dealers of Fine Minerals and Natural Crystal Clusters since 1989. We buy rock collections, we buy gem collections, we buy mineral collections.

General Theophrastite Information

Chemical Formula:

Ni(OH)2

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

Empirical Formula:

Ni(OH)₂

Environment:

Coatings in chromitite in lenses in serpentinites (

IMA Status:

Approved IMA 1981

Locality:

Verrnion district, 50 km west of Thessalonike, Macedonia, Greece. Link to MinDat.org Location Data.

Name Origin:

Named for Theophrastus, (ca. 371 BC-ca. 287 BC), the first Greek mineralogist.

Name Pronunciation:

Theophrastite + Pronunciation

Synonym:

ICSD 28101

PDF 14-117

Theophrastite Image

Images:

Click Here for Larger Theophrastite Image

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

Axial Ratios:

a:c = 1:1.47173

Cell Dimensions:

a = 3.131, c = 4.608, Z = 1; V = 39.12 Den(Calc)= 3.93

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 3m1

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

By Intensity(I/I_o): 2.335(1), 4.61(0.95), 1.755(0.5),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Wyckoff R W G , Crystal Structures , 1 (1963) p.239-444, Second edition. Interscience Publishers, New York, New York, Note: cadmium iodide structure

Physical Properties of Theophrastite

Color:

Emerald green.

Density:

Diaphaneity:

Transparent

Fracture:

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

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

light green

Optical Properties of Theophrastite

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

Optical Data:

Uniaxial (+), w=1.759-1.76, e=1.759-1.76, bire=0.0000.

Calculated Properties of Theophrastite

Electron Density:

Bulk Density (Electron Density)=3.90 gm/cc
note: Specific Gravity of Theophrastite =3.93 gm/cc.

Fermion Index:

Fermion Index = 0.0073228105
Boson Index = 0.9926771895

Photoelectric:

PE_{Theophrastite}= 24.82 barns/electron
U=PE_{Theophrastite} x rElectron Density= 96.81 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Theophrastite is Not Radioactive

Theophrastite Classification

Dana Class:

06.02.01.05 (06)Hydroxides and Oxides Containing Hydroxyl

(06.02)where X++ (OH)2

(06.02.01)Brucite group (Rhombohedral: P-3m1)

06.02.01.01 Brucite Mg(OH)2 P 3m1 3 2/m

06.02.01.02 Amakinite (Fe,Mg)(OH)2 P 3m1 3 2/m

06.02.01.03 Pyrochroite Mn(OH)2 P 3m1 3 2/m

06.02.01.04 Portlandite Ca(OH)2 P 3m1 3 2/m

06.02.01.05 Theophrastite Ni(OH)2 P 3m1 3 2/m

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

References:

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

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
14 - WWW-MINCRYST

Search for Theophrastite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Theophrastite :

Dakota Matrix Minerals Google Search for Theophrastite
John Betts Fine Minerals Search for Theophrastite
McDougall Minerals Google Search for Theophrastite
Rock and Mineral Shows Google Search for Theophrastite
Weinrich Minerals, Inc. Google Search for Theophrastite

Ask about Theophrastite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Theophrastite

Ni(OH)2
Dana No: 06.02.01.05 Strunz No: 04.FE.05
Locality:

Notes: