Mineralogy Database

Melanterite Mineral Data

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General Melanterite Information

Help on Chemical  Formula: Chemical Formula: Fe++SO4•7(H2O)
Help on Composition: Composition: Molecular Weight = 278.02 gm
   Iron      20.09 %  Fe   25.84 % FeO
   Hydrogen   5.08 %  H    45.36 % H2O
   Sulfur    11.53 %  S    28.80 % SO3
   Oxygen    63.30 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+(SO4)•7(H2O)
Help on Environment: Environment: Secondary mineral formed by the oxidation of iron sulfide minerals.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1850
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek melas, "black."
Help on Name Pronunciation: Name Pronunciation: Melanterite + Pronunciation Say MELANTERITE
Help on Synonym: Synonym: Copperas
  Green Vitrol
  ICSD 16589
  PDF 22-633
  Pistanite (copper bearing)
 

Melanterite Image

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  Melanterite

Comments: Deep greenish blue encrustation of melanterite. The pistanite variety is copper-bearing where Cu replaces some of the Fe in the crystal structure.
Location: Patagonia District, Arizona, USA. Scale: 5 x 9.5 cm.
© John Veevaert

Melanterite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.1674:1:1.6927
Help on Cell Dimensions: Cell Dimensions: a = 14.11, b = 6.51, c = 11.02, Z = 4; beta = 105.25° V = 976.61 Den(Calc)= 1.89
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.9(1), 3.78(0.64), 3.23(0.2),
Help on Forms: Forms:

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

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

Help on Above

Forms: ( 1 0 3) ( 1 0 1) ( 0 1 1) ( 1 1 0) ( 0 0 1)

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Physical Properties of Melanterite

Help on Cleavage: Cleavage: {001} Perfect, {110} Distinct
Help on Color: Color: Green, Yellow green, Brownish black, Bluish green, Greenish white.
Help on Density: Density: 1.89 - 1.9, Average = 1.89
Help on Diaphaneity: Diaphaneity: Subtransparent to translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Capillary - Very slender and long, like a thread or hair (e.g. millerite).
Help on Habit: Habit: Efflorescences - Crystals covering matrix, generally produced from transpiro-evaporation.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Melanterite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.253,KPDmeas= 0.2523,KC= 0.2538
Ncalc = 1.48
Help on Optical Data: Optical Data: Biaxial (+), a=1.47-1.471, b=1.4765-1.4795, g=1.486, bire=0.0150-0.0160, 2V(Calc)=80, 2V(Meas)=86. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): n.
 

Calculated Properties of Melanterite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.96 gm/cc
note: Specific Gravity of Melanterite =1.89 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.00543507
Boson Index = 0.99456493
Help on Photoelectric: Photoelectric: PEMelanterite = 6.48 barns/electron
U=PEMelanterite x rElectron Density= 12.68 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Melanterite is Not Radioactive
 

Melanterite Classification

Help on  Dana Class: Dana Class: 29.06.10.01 (29)Hydrated Acid and Sulfates
  (29.06)where A XO4 � x(H2O)
  (29.06.10)Melanterite Group (Heptahydrates, Monoclinic: P21/c)
 
29.06.10.01 Melanterite FeSO4•7(H2O) P 21/c 2/m
 
29.06.10.02 Boothite CuSO4•7(H2O) P 21/c 2/m
 
29.06.10.03 Zincmelanterite (Zn,Cu,Fe)SO4•7(H2O) P 21/c 2/m
 
29.06.10.04 Bieberite CoSO4•7(H2O) P 21/c 2/m
 
29.06.10.05 Mallardite MnSO4•7(H2O) P 21/c 2/m
 
29.06.10.06 Alpersite! (Mg,Cu)SO4•7H2O P 21/c 2/m
Help on  Strunz Class: Strunz Class: 07.CB.35 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CB -With only medium-sized cations
 
07.CB.35 Bieberite CoSO4•7(H2O) P 21/c 2/m
 
07.CB.35 Boothite CuSO4•7(H2O) P 21/c 2/m
 
07.CB.35 Mallardite MnSO4•7(H2O) P 21/c 2/m
 
07.CB.35 Melanterite FeSO4•7(H2O) P 21/c 2/m
 
07.CB.35 Zincmelanterite (Zn,Cu,Fe)SO4•7(H2O) P 21/c 2/m
 
07.CB.35 Alpersite! (Mg,Cu)SO4•7H2O P 21/c 2/m
 

Other Melanterite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Melanterite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - CalTech Mineral Spectroscopy
7 - EUROmin Project
8 - Ecole des Mines de Paris
9 - GeoScienceWorld
10 - Google Images
11 - Google Scholar
12 - Handbook of Mineralogy (MinSocAm)
13 - Handbook of Mineralogy (UofA)
14 - MinDAT
15 - Mineralienatlas (Deutsch)
16 - NSDL Reciprocal Net (JAVA)
17 - Online Mineral Museum
18 - QUT Mineral Atlas
19 - Ruff.Info
20 - WWW-MINCRYST

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Melanterite

Fe++SO4•7(H2O)
Dana No: 29.06.10.01 Strunz No: 07.CB.35
Locality:

 

Notes:

 

 
   
 


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