Mineralogy Database

Changoite Mineral Data

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General Changoite Information

Help on Chemical  Formula: Chemical Formula: Na2Zn(SO4)2•4(H2O)
Help on Composition: Composition: Molecular Weight = 375.56 gm
   Sodium    12.24 %  Na   16.50 % Na2O
   Zinc      17.41 %  Zn   21.67 % ZnO
   Hydrogen   2.15 %  H    19.19 % H2O
   Sulfur    17.08 %  S    42.64 % SO3
   Oxygen    51.12 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2Zn(SO4)2•4(H2O)
Help on Environment: Environment: Found as a product of oxidation in an old mining area. The zinc-dominant analogue of bl�dite and nickelbl�dite.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: 2 km west of Sierra Gorda, northeast of Antofagasta, northern Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the changos, the early former inhabitants of northern Chile.
Help on Synonym: Synonym: IMA1997-041

Changoite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.3428:1:0.6706
Help on Cell Dimensions: Cell Dimensions: a = 11.077, b = 8.249, c = 5.532, Z = 2; beta = 100.183° V = 497.52 Den(Calc)= 2.51
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.289(1), 4.55(0.58), 3.262(0.35),

Physical Properties of Changoite

Help on Color: Color: Colorless.
Help on Density: Density: 2.5
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Water Soluble - Water soluble mineral.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Changoite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.204,KPDmeas= 0.2048,KC= 0.2063
Ncalc = 1.52
Help on Optical Data: Optical Data: Biaxial (-), a=1.507, b=1.512, g=1.517, bire=0.0100

Calculated Properties of Changoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.50 gm/cc
note: Specific Gravity of Changoite =2.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0086680282
Boson Index = 0.9913319718
Help on Photoelectric: Photoelectric: PEChangoite = 9.60 barns/electron
U=PEChangoite x rElectron Density= 24.03 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Changoite is Not Radioactive

Changoite Classification

Help on  Dana Class: Dana Class: (29)Hydrated Acid and Sulfates
  (29.03)where (A+)2 B (XO4)2 � x(H2O)
  (29.03.03)Blodite Group Blodite Na2Mg(SO4)2•4(H2O) P 21/a 2/m Nickelblodite Na2(Ni,Mg)(SO4)2•4(H2O) P 21/a 2/m Leonite K2Mg(SO4)2•4(H2O) C 2/m 2/m Mereiterite! K2Fe(SO4)2•4(H2O) C 2/m 2/m Changoite! Na2Zn(SO4)2•4(H2O) P 21/a 2/m
Help on  Strunz Class: Strunz Class: 07.CC.50 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CC -With medium-sized and large cations
07.CC.50 Blodite Na2Mg(SO4)2•4(H2O) P 21/a 2/m
07.CC.50 Changoite! Na2Zn(SO4)2•4(H2O) P 21/a 2/m
07.CC.50 Nickelblodite Na2(Ni,Mg)(SO4)2•4(H2O) P 21/a 2/m

Other Changoite Information

Help on References: References: NAME( CanMin 8/1999) PHYS. PROP.(AmMin, V84, p. 1685) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Changoite :
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.CC.50





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