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Natrochalcite Mineral Data

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General Natrochalcite Information

Help on Chemical  Formula: Chemical Formula: NaCu2(SO4)2(OH)•(H2O)
Help on Composition: Composition: Molecular Weight = 377.23 gm
   Sodium     6.09 %  Na    8.21 % Na2O
   Copper    33.69 %  Cu   37.93 % Cu2O
   Hydrogen   0.80 %  H     7.16 % H2O
   Sulfur    17.00 %  S    42.45 % SO3
   Oxygen    42.41 %  O
            ______        ______ 
            100.00 %       95.76 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaCu2(SO4)2(OH)•(H2O)
Help on Environment: Environment: Secondary mineral in arid climates.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1908
Help on Locality: Locality: Chuquicamata, Antofagasta, Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the compositon, NATRium (Na), and CHALCos, (Cu).
Help on Name Pronunciation: Name Pronunciation: Natrochalcite + Pronunciation Say NATROCHALCITE
Help on Synonym: Synonym: ICSD 73265
  PDF 19-1189

Natrochalcite Image

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  Krohnkite   Natrochalcite

Comments: Royal blue kröhnkite and green natrochalcite.
Location: Chiquicamata, Chile. Scale: 3.5 x 2 cm.
© John Veevaert

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Comments: Green, transparent crystals of natrochalcite on dark green atacamite.
Location: Chuquicamata, Antofagasta, Chile. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Natrochalcite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.3522:1:1.2077
Help on Cell Dimensions: Cell Dimensions: a = 8.33, b = 6.16, c = 7.44, Z = 2; beta = 112.9° V = 351.68 Den(Calc)= 3.56
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: I2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.797(1), 3.44(0.8), 6.57(0.8),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 7 1 2) ( 1 1 1) ( 1 1 1) ( 1 1 0) ( 1 0 0) ( 0 0 1)

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Physical Properties of Natrochalcite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Emerald green.
Help on Density: Density: 3.49
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: greenish white

Optical Properties of Natrochalcite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.055 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.073 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.189,KPDmeas= 0.1927,KC= 0.2039
Ncalc = 1.71 - 1.73
Help on Optical Data: Optical Data: Biaxial (+), a=1.649, b=1.655, g=1.714, bire=0.0650, 2V(Calc)=38, 2V(Meas)=36.8. Dispersion r < v strong.

Calculated Properties of Natrochalcite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.40 gm/cc
note: Specific Gravity of Natrochalcite =3.49 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0014798355
Boson Index = 0.9985201645
Help on Photoelectric: Photoelectric: PENatrochalcite = 15.71 barns/electron
U=PENatrochalcite x rElectron Density= 53.49 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Natrochalcite is Not Radioactive

Natrochalcite Classification

Help on  Dana Class: Dana Class: (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.08)where (A+ B++)3 (XO4)2 Zq�x(H2O)
  (31.08.01)Dana Group Natrochalcite NaCu2(SO4)2(OH)•(H2O) I2/m 2/m
Help on  Strunz Class: Strunz Class: 07.DF.15 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DF -With large and medium-sized cations
07.DF.15 Natrochalcite NaCu2(SO4)2(OH)•(H2O) I2/m 2/m

Other Natrochalcite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Natrochalcite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 07.DF.15





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