Theophrastite Mineral Data

Theophrastite Mineral Data +

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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

IMA Status:

Approved IMA 1981

Locality:

Link to MinDat.org Location Data.

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
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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:

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Theophrastite

Electron Density:

r_electron=3.90 gm/cc
note: r_{Theophrastite}=3.93 gm/cc.

Fermion Index

Fermion Index = 0.00732
Boson Index = 0.99268

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Theophrastite is Not Radioactive

Theophrastite Classification

Dana Class:

6.2.1.5 (6)Hydroxides and Oxides Containing Hydroxyl

(6.2)where X++ (OH)2

(6.2.1)Brucite group (Rhombohedral: P3¯m1)

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

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

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

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

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

Strunz Class:

IV/F.03-40 IV - Oxides

IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure

IV/F.03 - Brucite series

IV/F.03-10 Brucite Mg(OH)2 P 3m1 3 2/m

IV/F.03-20 Amakinite (Fe,Mg)(OH)2 P 3m1 3 2/m

IV/F.03-30 Pyrochroite Mn(OH)2 P 3m1 3 2/m

IV/F.03-40 Theophrastite Ni(OH)2 P 3m1 3 2/m

IV/F.03-50 Paraotwayite Ni(OH)2-x(SO4,CO3)0.5xx=.5 Pm m

IV/F.03-60 Sweetite Zn(OH)2 P 4₁2₁2,P 4₃2₁2 4 2 2

IV/F.03-70 Ashoverite Zn(OH)2 I 4₁/amd 4/m 2/m 2/m

IV/F.03-80 Wulfingite Zn(OH)2 P 2₁2₁2₁ 2 2 2

IV/F.03-90 Spertiniite Cu(OH)2 C mc2₁ mm2

IV/F.03-100 Portlandite Ca(OH)2 P 3m1 3 2/m

Other Theophrastite Information

References:

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 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Theophrastite

Ni(OH)2
Dana No: 6.2.1.5 Strunz No: IV/F.03-40
Locality:

Notes: