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UM1987-01-CO:HMgS

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Formula:
Mg4(CO3)2(OH)4 · 6H2O ?
assuming the substitution of OH groups for a small fraction of sulfate anion (?); also possibly identical to the synthetic Mg4(CO3)2(OH)2(SO4).6H2O phase
Colour:
chalky white
Specific Gravity:
1.67
Crystal System:
Monoclinic
Possible dimorph of artinite.

Forms coatings on brucite from museum specimens. Also as veins, a few mm thick. Soft and porous.


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Classification of UM1987-01-CO:HMgSHide

Notes:
Unnamed (probably invalid)
Approval History:
Unnamed, and probably invalid.
5.DA.05

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
16b.3.8.

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
3 : AmBn(XO3)pZqxH2O & with (m+n):p = 2:1

Physical Properties of UM1987-01-CO:HMgSHide

Colour:
chalky white
Density:
1.67 g/cm3 (Measured)    
Comment:
heavy liquid method

Chemical Properties of UM1987-01-CO:HMgSHide

Formula:
Mg4(CO3)2(OH)4 · 6H2O ?

assuming the substitution of OH groups for a small fraction of sulfate anion (?); also possibly identical to the synthetic Mg4(CO3)2(OH)2(SO4).6H2O phase

Crystallography of UM1987-01-CO:HMgSHide

Crystal System:
Monoclinic
Cell Parameters:
a = 11.45 Å, b = 24.17 Å, c = 7.54 Å
β = 105.3°
Ratio:
a:b:c = 0.474 : 1 : 0.312
Unit Cell V:
2,012.71 ų (Calculated from Unit Cell)
Comment:
assuming identity to the synthetic phase mentioned above

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.60 (100)
6.40 (90)
4.92 (30)
4.81 (30)
3.97 (80)
2.95 (60)
2.718 (30)
2.528 (40)
Comments:
similar to that of PDF 7-410 (the phase mentioned in the "formula notes" field)

First Recorded Occurrence of UM1987-01-CO:HMgSHide

Synonyms of UM1987-01-CO:HMgSHide

Related Minerals - Nickel-Strunz GroupingHide

5.DA.AlexkhomyakoviteK6(Ca2Na)(CO3)5Cl·6H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mcm
5.DA.05DypingiteMg5(CO3)4(OH)2 · 5H2OMon.
5.DA.05GiorgiositeMg5(CO3)4(OH)2 · 5-6H2O
5.DA.05HydromagnesiteMg5(CO3)4(OH)2 · 4H2OMon.
5.DA.05WidgiemoolthaliteNi5(CO3)4(OH)2 · 5H2OMon.
5.DA.05UM1986-10-CO:ClHMgMnZn (also called Mineral F, Dunn, 1995)Mg5(Zn,Mn)3(CO3)2(OH,Cl)12 · H2O
5.DA.10ArtiniteMg2(CO3)(OH)2 · 3H2OMon.
5.DA.10IndigiriteMg2Al2(CO3)4(OH)2 · 15H2O
5.DA.10ChlorartiniteMg2(CO3)(OH)Cl · 2H2OTrig. 3m : R3c
5.DA.15OtwayiteNi2(CO3)(OH)2 · H2OOrth.
5.DA.15ZaratiteNi3(CO3)(OH)4 · 4H2O ?Iso.
5.DA.20KambaldaiteNaNi4(CO3)3(OH)3 · 3H2OHex.
5.DA.25CallaghaniteCu2Mg2(CO3)(OH)6 · 2H2OMon.
5.DA.30Claraite(Cu,Zn)15(CO3)4(AsO4)2(SO4)(OH)14·7H2OTric.
5.DA.35HydroscarbroiteAl14(CO3)3(OH)36 · nH2OTric.
5.DA.35ScarbroiteAl5(CO3)(OH)13 · 5H2OHex.
5.DA.40CaresiteFe2+4Al2(OH)12[CO3] · 3H2OTrig.
5.DA.40QuintiniteMg4Al2(OH)12[CO3] · 3H2OHex. 6 2 2 : P63 2 2
5.DA.40CharmariteMn2+4Al2(OH)12[CO3] · 3H2O
5.DA.45Stichtite-2HMg6(Cr,Al)2(CO3)(OH)16 · 4H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
5.DA.45BrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2OHex.
5.DA.45ChlormagaluminiteMg4Al2(OH)12Cl2 · 3H2OHex.
5.DA.45Hydrotalcite-2HMg6Al2(CO3)(OH)16 · 4H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
5.DA.45Pyroaurite-2HMg6Fe3+2(OH)16(CO3) · 4H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
5.DA.45ZaccagnaiteZn4Al2(OH)12[CO3] · 3H2OHex.
5.DA.50ComblainiteNi4Co2(OH)12[CO3] · 3H2OTrig.
5.DA.50DesautelsiteMg6Mn3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m)
5.DA.50HydrotalciteMg6Al2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
5.DA.50PyroauriteMg6Fe3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
5.DA.50ReevesiteNi6Fe3+2(OH)16(CO3) · 4H2OTrig.
5.DA.50StichtiteMg6Cr3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
5.DA.50TakoviteNi6Al2(OH)16[CO3] · 4H2OTrig.
5.DA.50UM1998-10-CO:CoHNiCo6Fe2(CO3)(OH)16 · 4H2O ?
5.DA.55CoalingiteMg10Fe3+2(OH)24[CO3] · 2H2OTrig.

Other InformationHide

IR Spectrum:
results similar to that obtained for artinite
Thermal Behaviour:
(1) 2 stage of water of crystallization loss, up to ca. 260 oC; (2) CO and OH derived simultaneously between
260 and 360 oC
Notes:
readily soluble and effervescent in diluted HCl; very delicate: destroyed even by slight grinding
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 UM1987-01-CO:HMgSHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Livingstone, A. (1987): A basic magnesium carbonate, a possible dimorph of artinite, from Unst, Scotland: Mineralogical Magazine: 51: 459-462
Smith, D.G.W., Nickel, E.H. (2007): A System of Codification for Unnamed Minerals: Report of the SubCommittee for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification. Canadian Mineralogist: 45: 983-1055; http://nrmima.nrm.se (2016)

Internet Links for UM1987-01-CO:HMgSHide

Localities for UM1987-01-CO:HMgSHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
UK (FRL)
 
  • Scotland
    • Shetland Islands
      • Unst
Mineralogical Magazine 51,459(1987)
Mineral and/or Locality  
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