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Stichtite-2H

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Formula:
Mg6(Cr,Al)2(CO3)(OH)16 · 4H2O
Colour:
Intense violet to rose-pink; violet to light rose-pink in transmitted light
Lustre:
Waxy, Pearly
Hardness:
1½ - 2
Specific Gravity:
2.05 - 2.15
Crystal System:
Hexagonal
Name:
For the type locality, Barberton District, Transvaal, South Africa.
A polytype of Stichtite

Originally named barbertonite. Recognised as a polytype of stichtite and accordingly discredited (Mills et al., 2011, 2012).



Classification of Stichtite-2H

5.DA.45

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
16b.6.1.2

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
6 : AmBn(XO3)pZqxH2O & with (m+n):p = 8:1

Physical Properties of Stichtite-2H

Waxy, Pearly
Transparency:
Transparent
Colour:
Intense violet to rose-pink; violet to light rose-pink in transmitted light
Streak:
Very pale violet to white
Hardness:
1½ - 2 on Mohs scale
Tenacity:
Elastic
Cleavage:
Perfect
on {0001}
Density:
2.05 - 2.15 g/cm3 (Measured)    2.11 g/cm3 (Calculated)

Optical Data of Stichtite-2H

Type:
Uniaxial (-)
RI values:
nω = 1.557 nε = 1.529
Max Birefringence:
δ = 0.028
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Weak
Comments:
O = dark rose-pink to violet
E = light rose-pink to violet

Chemical Properties of Stichtite-2H

Formula:
Mg6(Cr,Al)2(CO3)(OH)16 · 4H2O

Crystallography of Stichtite-2H

Crystal System:
Hexagonal
Cell Parameters:
a = 6.17 Å, c = 15.52 Å
Ratio:
a:c = 1 : 2.515
Unit Cell V:
511.67 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Platy crystals, flattened on {0001}. Massive, in matted or contorted masses of fibers or plates; alos as cross-fiber veinlets.

First Recorded Occurrence of Stichtite-2H

General Appearance of First Recorded Material:
Platy crystals, fibrous matted masses and cross-fiber veinlets
Place of Conservation of First Recorded Material:
Harvard University, Cambridge, Massachusetts, USA (No. 92549)
Geological Setting of First Recorded Material:
Alteration products of chromite in serpentinite
Associated Minerals at First Recorded Locality:

Synonyms of Stichtite-2H

Other Language Names for Stichtite-2H

Bosnian (Cyrillic Script):Stichtite-2H
Spanish:Barbertonita

Common Associates

Associated Minerals Based on Photo Data:
Stichtite2 photos of Stichtite-2H associated with Stichtite on mindat.org.
Serpentine Subgroup1 photo of Stichtite-2H associated with Serpentine Subgroup on mindat.org.
Magnesiochromite1 photo of Stichtite-2H associated with Magnesiochromite on mindat.org.
Aragonite1 photo of Stichtite-2H associated with Aragonite on mindat.org.
Chrysotile1 photo of Stichtite-2H associated with Chrysotile on mindat.org.

Related Minerals - Nickel-Strunz Grouping

5.DA.AlexkhomyakoviteK6(Ca2Na)(CO3)5Cl·6H2O
5.DA.05DypingiteMg5(CO3)4(OH)2 · 5H2O
5.DA.05GiorgiositeMg5(CO3)4(OH)2 · 5-6H2O
5.DA.05HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
5.DA.05WidgiemoolthaliteNi5(CO3)4(OH)2 · 5H2O
5.DA.05UM1986-10-CO:ClHMgMnZnMg5(Zn,Mn)3(CO3)2(OH,Cl)12 · H2O
5.DA.05UM1987-01-CO:HMgSMg4(CO3)2(OH)4 · 6H2O ?
5.DA.10ArtiniteMg2(CO3)(OH)2 · 3H2O
5.DA.10IndigiriteMg2Al2(CO3)4(OH)2 · 15H2O
5.DA.10ChlorartiniteMg2(CO3)(OH)Cl · 2H2O
5.DA.15OtwayiteNi2(CO3)(OH)2 · H2O
5.DA.15ZaratiteNi3(CO3)(OH)4 · 4H2O ?
5.DA.20KambaldaiteNaNi4(CO3)3(OH)3 · 3H2O
5.DA.25CallaghaniteCu2Mg2(CO3)(OH)6 · 2H2O
5.DA.30Claraite(Cu,Zn)15(CO3)4(AsO4)2(SO4)(OH)14·7H2O
5.DA.35HydroscarbroiteAl14(CO3)3(OH)36 · nH2O
5.DA.35ScarbroiteAl5(CO3)(OH)13 · 5H2O
5.DA.40CaresiteFe2+4Al2(OH)12[CO3] · 3H2O
5.DA.40QuintiniteMg4Al2(OH)12[CO3] · 3H2O
5.DA.40CharmariteMn2+4Al2(OH)12[CO3] · 3H2O
5.DA.45BrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2O
5.DA.45ChlormagaluminiteMg4Al2(OH)12Cl2 · 3H2O
5.DA.45Hydrotalcite-2HMg6Al2(CO3)(OH)16 · 4H2O
5.DA.45Pyroaurite-2HMg6Fe3+2(OH)16(CO3) · 4H2O
5.DA.45ZaccagnaiteZn4Al2(OH)12[CO3] · 3H2O
5.DA.50ComblainiteNi4Co2(OH)12[CO3] · 3H2O
5.DA.50DesautelsiteMg6Mn3+2(OH)16[CO3] · 4H2O
5.DA.50HydrotalciteMg6Al2(OH)16[CO3] · 4H2O
5.DA.50PyroauriteMg6Fe3+2(OH)16[CO3] · 4H2O
5.DA.50ReevesiteNi6Fe3+2(OH)16(CO3) · 4H2O
5.DA.50StichtiteMg6Cr3+2(OH)16[CO3] · 4H2O
5.DA.50TakoviteNi6Al2(OH)16[CO3] · 4H2O
5.DA.50UM1998-10-CO:CoHNiCo6Fe2(CO3)(OH)16 · 4H2O ?
5.DA.55CoalingiteMg10Fe3+2(OH)24[CO3] · 2H2O

Related Minerals - Dana Grouping (8th Ed.)

16b.6.1.1Hydrotalcite-2HMg6Al2(CO3)(OH)16 · 4H2O
16b.6.1.3Pyroaurite-2HMg6Fe3+2(OH)16(CO3) · 4H2O
16b.6.1.4ZaccagnaiteZn4Al2(OH)12[CO3] · 3H2O

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Stichtite-2H

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Read and Dixon (1933), Mineralogical Magazine: 23: 309.
Mineralogical Society of America Annual Meeting, Program Abstracts, 1940, 6.
Frondel, C. (1941): Constitution and polymorphism of the pyroaurite and sjögrenite groups. American Mineralogist 26, 295-315.
Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 659.
Taylor, H. W. F. (1973): Crystal structures of some double hydroxide minerals. Mineralogical Magazine 39, 377-389.
Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 39.
Mills, S. J., Whitfield, P. S., Wilson, S. A., Woodhouse, J. A., Dipple, G. M., Raudsepp, M. & Francis, C. A. (2011) The crystal structure of stitchtite, re-examination of barbertonite and the nature of polytypism in MgCr hydrotalcites. American Mineralogist, 96(1), 179–187.
Mills, S.J., Christy, A.G., Genin, J.-M.R., Kameda, T., Colombo, F. (2012): Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine, 76, 1289-1336.

Internet Links for Stichtite-2H

mindat.org URL:
https://www.mindat.org/min-514.html
Please feel free to link to this page.

Localities for Stichtite-2H

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia
 
  • Tasmania
    • West Coast municipality
      • Zeehan district
        • North Dundas
R Bottrill, unpublished data
Czech Republic
 
  • Moravia (Mähren; Maehren)
    • South Moravia Region
      • Letovice (Lettowitz)
Ulrych, J.: Stichtit z hadcového tělesa od Slatinky u Letovic. Časopis pro mineralogii a geologii, 1966, roč. 11, č. 3, s. 311-315.
New Zealand
 
  • North Island
    • Manawatu-Wanganui
      • Tararua
        • Maharahara
Railton, G.L. & Watters, W.A. (1990): Minerals of New Zealand
South Africa (FRL)
 
  • Mpumalanga Province
    • Ehlanzeni District
Am Min 26 (1941), 295
        • Kaapsche Hoop (Kaapsehoop)
Rocks & Min.: 21:275.
UK
 
  • Scotland
    • Shetland Islands
      • Mainland
        • Cunningsburgh
Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 39
Mineral and/or Locality  
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