Mineralogy Database

Gerhardtite Mineral Data

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General Gerhardtite Information

Help on Chemical  Formula: Chemical Formula: Cu2(NO3)(OH)3
Help on Composition: Composition: Molecular Weight = 240.12 gm
   Copper    52.93 %  Cu   66.25 % CuO
   Hydrogen   1.26 %  H    11.25 % H2O
   Nitrogen   5.83 %  N    22.49 % N2O5
   Oxygen    39.98 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu2(NO3)(OH)3
Help on Environment: Environment: Secondary mineral in oxidized portions of copper deposits. Dimorphous with rouaite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1885
Help on Locality: Locality: United Verde mine, Jerome, Yavapai Co., Arizona, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Charles Frederic Gerhardt (1816-1856), American chemist who first prepared the artificial compound.
Help on Name Pronunciation: Name Pronunciation: Gerhardtite + Pronunciation Say GERHARDTITE
 

Gerhardtite Image

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  Gerhardtite

Comments: Emerald green crystalline crust of gerhardtite on copper.
Location: Greenland, Ontonagon County, Michigan, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gerhardtite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9204:1:2.2735
Help on Cell Dimensions: Cell Dimensions: a = 5.592, b = 6.075, c = 13.812, Z = 4; V = 469.21 Den(Calc)= 3.40
Help on Crystal System: Crystal System: Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 212121
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.91(1), 2.31(0.8), 2.624(0.8),
Help on Forms: Forms:

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Help on Above

Forms: ( 2 0 1) ( 1 1 2) ( 2 2 1) ( 1 1 0) ( 1 1 1) ( 0 0 1)

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Physical Properties of Gerhardtite

Help on Cleavage: Cleavage: {001} Perfect, {100} Good
Help on Color: Color: Green, Dark green.
Help on Density: Density: 3.4 - 3.43, Average = 3.41
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light green
 

Optical Properties of Gerhardtite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2096,KPDmeas= 0.2087,KC= 0.2053
Ncalc = 1.7
Help on Optical Data: Optical Data: Biaxial (+), a=1.703, b=1.713, g=1.722, bire=0.0190, 2V(Calc)=86, 2V(Meas)=85.
 

Calculated Properties of Gerhardtite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.30 gm/cc
note: Specific Gravity of Gerhardtite =3.42 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEGerhardtite = 23.19 barns/electron
U=PEGerhardtite x rElectron Density= 76.52 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gerhardtite is Not Radioactive
 

Gerhardtite Classification

Help on  Dana Class: Dana Class: 19.01.01.01 (19)Nitrates - Hydroxyl or Halogen
  (19.01)with miscellaneous formulae
  (19.01.01)Dana Group
 
19.01.01.01 Gerhardtite Cu2(NO3)(OH)3 P 212121 2 2 2
 
19.01.01.02 Rouaite! Cu2(NO3)(OH)3 P 21 2
Help on  Strunz Class: Strunz Class: 05.NB.05 05 - CARBONATES (NITRATES)
  05.N - NITRATES
  05.NB -With OH
 
05.NB.05 Gerhardtite Cu2(NO3)(OH)3 P 212121 2 2 2
 
05.NB.05 Rouaite! Cu2(NO3)(OH)3 P 21 2
 

Other Gerhardtite 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 Gerhardtite :
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 Gerhardtite Specimen Label here :

Gerhardtite

Cu2(NO3)(OH)3
Dana No: 19.01.01.01 Strunz No: 05.NB.05
Locality:

 

Notes:

 

 
   
 


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