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Stichtite Mineral Data

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General Stichtite Information

Help on Chemical Formula: Chemical Formula: Mg6Cr2(CO3)(OH)16•4(H2O)
Help on Composition: Composition: Molecular Weight = 654.01 gm
   Magnesium  22.30 %  Mg   36.98 % MgO
   Chromium   15.90 %  Cr   23.24 % Cr2O3
   Hydrogen    3.70 %  H    33.06 % H2O
   Carbon      1.84 %  C     6.73 % CO2
   Oxygen     56.27 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg6Cr2(OH)16(CO3)•4(H2O)
Help on Environment: Environment: Alteration product of serpentine.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1910
Help on Locality: Locality: Dundas, Tasmania. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Robert Sticht, director of a mining corporation.
Help on Name Pronunciation: Name Pronunciation: Stichtite + Pronunciation Say STICHTITE
 

Stichtite Image

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  Stichtite

Comments: Massive, fibrous, lavender-purple stichtite.
Location: Kaapsche Hoop, Barberton District, Mpumalanga Province, South Africa. Scale: 5x3x2 cm.
© John Betts - Fine Minerals

Stichtite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:7.50485
Help on Cell Dimensions: Cell Dimensions: a = 6.18, c = 46.38, Z = 3; V = 1,534.05 Den(Calc)= 2.12
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.8(1), 3.91(0.9), 2.6(0.4),
 

Physical Properties of Stichtite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: Lilac, Light violet, Pink.
Help on Density: Density: 2.2
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Micaceous - Platy texture with "flexible" plates.
Help on Habit: Habit: Nodular - Tuberose forms having irregular protuberances over the surface.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: pale violet blue
 

Optical Properties of Stichtite

Help on Dichroism (e): Dichroism (e): colorless.
Help on Dichroism (w): Dichroism (w): colorless.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.103 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.069 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2495,KPDmeas= 0.2405,KC= 0.2679
Ncalc = 1.57 - 1.59
Help on Optical Data: Optical Data: Uniaxial (+), w=1.516, e=1.542, bire=0.0260.
 

Calculated Properties of Stichtite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.17 gm/cc
note: Specific Gravity of Stichtite =2.12 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEStichtite = 4.01 barns/electron
U=PEStichtite x rElectron Density= 8.67 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Stichtite is Not Radioactive
 

Stichtite Classification
Help on Dana Class: Dana Class: 16b.06.02.02 (16b)Carbonates - Hydroxyl or Halogen
  (16b.06)Dana Type
  (16b.06.02)Sjorgrenite-Hydrotalcite Group (Hydrotalcite Subgroup:Rhombohedral)
 
16b.06.02.01 Hydrotalcite Mg6Al2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
16b.06.02.02 Stichtite Mg6Cr2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
16b.06.02.03 Pyroaurite Mg6Fe2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
16b.06.02.04 Desautelsite Mg6Mn2(CO3)(OH)16•4(H2O) R 3m or R 3m Trig
 
16b.06.02.05 Droninoite! Ni3FeCl(OH)8•2H2O R 3m, R 3m or R 32 Trig
Help on Strunz Class: Strunz Class: 05.DA.50 05 - CARBONATES (NITRATES)
  05.D - Carbonates with Additional Anions, with H2O
  05.DA -With medium-sized cations
 
05.DA.50 Desautelsite Mg6Mn2(CO3)(OH)16•4(H2O) R 3m or R 3m Trig
 
05.DA.50 Comblainite Ni6Co2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
05.DA.50 Hydrotalcite Mg6Al2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
05.DA.50 Pyroaurite Mg6Fe2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
05.DA.50 Reevesite Ni6Fe2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
05.DA.50 Stichtite Mg6Cr2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
05.DA.50 Takovite Ni6Al2(OH)16(CO3,OH)•4(H2O) R 3m 3 2/m
 

Other Stichtite 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 Stichtite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Stichtite

Mg6Cr2(CO3)(OH)16•4(H2O)
Dana No: 16b.06.02.02 Strunz No: 05.DA.50
Locality:

 

Notes:

 
 
   
 

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