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Theophrastite

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About TheophrastiteHide

Theophrastus
Formula:
Ni(OH)2
Colour:
Emerald Green
Lustre:
Silky
Hardness:
Specific Gravity:
4.00
Crystal System:
Trigonal
Name:
Named after Theophrastus (ca 371-286 BCE), Greek philosopher and writer, disciple of Aristotle. Although commonly known by his honorary name, his given name was Tyrtamus. Author in about 315 BCE of Περι λιθων, "On Stones" possibly the first mineralogy book.
Brucite Group.

The nickel analogue of Brucite.


Classification of TheophrastiteHide

Approved
Approval Year:
1980
4.FE.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
E : Hydroxides with OH, without H2O; sheets of edge-sharing octahedra
6.2.1.5

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
2 : X(OH)2
7.22.3

7 : Oxides and Hydroxides
22 : Oxides of Ni

Physical Properties of TheophrastiteHide

Silky
Transparency:
Translucent
Colour:
Emerald Green
Streak:
Light green
Hardness:
3½ on Mohs scale
Cleavage:
Perfect
on {0001}
Fracture:
Conchoidal
Density:
4.00 g/cm3 (Measured)    3.95 g/cm3 (Calculated)

Optical Data of TheophrastiteHide

Type:
Uniaxial (+)
RI values:
nω = 1.759 - 1.760 nε = 1.759 - 1.760
Birefringence:
Very weak
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Weak

Chemical Properties of TheophrastiteHide

Formula:
Ni(OH)2

Crystallography of TheophrastiteHide

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
P3m1
Cell Parameters:
a = 3.131 Å, c = 4.608 Å
Ratio:
a:c = 1 : 1.472
Unit Cell V:
39.12 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Platy. fibrous, botyroidal crusts.
Comment:
On synthetic

Type Occurrence of TheophrastiteHide

Place of Conservation of Type Material:
Smithsonian 148460

Synonyms of TheophrastiteHide

Other Language Names for TheophrastiteHide

Related Minerals - Nickel-Strunz GroupingHide

4.FE.05Amakinite(Fe2+,Mg)(OH)2Trig.
4.FE.05BruciteMg(OH)2Trig. 3m (3 2/m) : P3m1
4.FE.05PortlanditeCa(OH)2Trig. 3m (3 2/m)
4.FE.05PyrochroiteMn(OH)2Trig. 3m (3 2/m)
4.FE.10BayeriteAl(OH)3Mon. 2/m : P21/m
4.FE.10DoyleiteAl(OH)3Tric.
4.FE.10GibbsiteAl(OH)3Mon. 2/m
4.FE.10NordstranditeAl(OH)3Tric. 1 : P1
4.FE.15BöhmiteAlO(OH)Orth. mmm (2/m 2/m 2/m)
4.FE.15Lepidocrociteγ-Fe3+O(OH)Orth. mm2 : Cmc21
4.FE.20GrimaldiiteCrO(OH)Trig.
4.FE.20HeterogeniteCo3+O(OH)Hex.
4.FE.25FeitknechtiteMn3+O(OH)Trig. 3m (3 2/m) : P3m1
4.FE.25Lithiophorite(Al,Li)MnO2(OH)2Trig. 3m (3 2/m) : R3m
4.FE.30QuenselitePbMnO2(OH)Mon. 2/m : P2/b
4.FE.35FerrihydriteFe3+10O14(OH)2Trig.
4.FE.40FeroxyhyteFe3+O(OH)Hex.
4.FE.40Vernadite(Mn4+,Fe3+,Ca,Na)(O,OH)2 · nH2OHex.
4.FE.45QuetzalcoatliteZn6Cu3(TeO6)2(OH)6 · AgxPbyClx+2yTrig. 3m (3 2/m) : P3m1

Related Minerals - Dana Grouping (8th Ed.)Hide

6.2.1.1BruciteMg(OH)2Trig. 3m (3 2/m) : P3m1
6.2.1.2Amakinite(Fe2+,Mg)(OH)2Trig.
6.2.1.3PyrochroiteMn(OH)2Trig. 3m (3 2/m)
6.2.1.4PortlanditeCa(OH)2Trig. 3m (3 2/m)

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.22.1BunseniteNiOIso. m3m (4/m 3 2/m) : Fm3m
7.22.4JamboriteNi2+1-xCo3+x(OH)2-x(SO4)x · nH2OTrig. 3m (3 2/m) : R3m
7.22.5TakoviteNi6Al2(OH)16[CO3] · 4H2OTrig.
7.22.6TrevoriteNi2+Fe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
7.22.7Nichromite(Ni,Co,Fe)(Cr,Fe,Al)2O4Iso. m3m (4/m 3 2/m) : Fd3m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for TheophrastiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Marcopoulos, T. & Economou, M. (1981): Theophrastite, Ni(OH)2, a new mineral from northern Greece. American Mineralogist: 66: 1020-1021.

Internet Links for TheophrastiteHide

Localities for TheophrastiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • Tasmania
    • Waratah-Wynyard municipality
      • Heazlewood district
Henry, D. A. & Birch, W. D. (1992): Otwayite and theophrastite from the Lord Brassey Mine, Tasmania. Mineralogical Magazine 56, 252-255.; Anderson, P., Bottrill, R. & Davidson, P. (2002): Famous mineral localities: The Lord Brassey mine, Tasmania. Mineralogical Record 33, 321-332
Canada
 
  • Québec
    • Estrie
      • Les Sources RCM
        • Asbestos
HORVÁTH, L., PFENNINGER-HORVÁTH, E. and SPERTINI, F. (2013) The Jeffrey mine, Asbestos, Québec, Canada: A mineralogical review. Mineralogical Record, 44, 375-417.
Greece (TL)
 
  • Macedonia Department
    • Pélla Prefecture
American Mineralogist, Yolume 66, pages 1020-1021, 1981
Italy
 
  • Lombardy
    • Sondrio Province
      • Valtellina
        • Malenco Valley
          • Lanterna Valley
            • Lanzada
              • Campo Franscia (Franscia)
Bedognè, F., Montrasio, A., Sciesa, E. (1993) I minerali della provincia di Sondrio: Valmalenco. Bettini, Sondrio, 275 pp.
Russia
 
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast
        • Verkhnii Ufalei
          • Ufaley District (Ufalei District)
Pavel M. Kartashov analytical data (2013), Mikhail Uchitel' specimen
UK
 
  • Scotland
    • Shetland Islands
      • Unst
        • Baltasound-Haroldswick area
Bish, D.L. and Livingstone, A. (1981) The Crystal Chemistry and Paragenesis of Honessite and Hydrohonessite: The Sulphate Analogues of Reevesite. Mineralogical Magazine, vol. 44, n° 335, p. 339-343. Livingstone, A. and Bish, D.L. (1982) On the New Mineral Theophrastite, a Nickel Hydroxide, from Unst, Shetland, Scotland. Mineralogical Magazine, vol. 46, n° 338, p. 1-5.; Livingstone, A. and Macpherson, H.G. (1983) Fifth supplementary list of British minerals (Scottish). Mineralogical Magazine, vol. 47, n° 342, p. 99-105.
Mineral and/or Locality  
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