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Giorgiosite

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Formula:
Mg5(CO3)4(OH)2 · 5-6H2O
Colour:
White
Lustre:
Silky
Specific Gravity:
2.170
Name:
For Giorgios, a volcanic cone on the island of Thera formed in 1866.
Inadequately described.
Compare hydromagnesite (lower hydrate), dypingite (similar), and 'UM1973-06-CO:MgH' (higher hydrate).


Hide all sections | Show all sections

Classification of GiorgiositeHide

Approved, 'Grandfathered' (first described prior to 1959), Questionable
5.DA.05

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
16b.7.2.2

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
7 : Miscellaneous
11.3.8

11 : Carbonates
3 : Carbonates of Mg

Physical Properties of GiorgiositeHide

Silky
Transparency:
Translucent
Colour:
White
Density:
2.170(15) g/cm3 (Measured)    
Comment:
Synthetic

Optical Data of GiorgiositeHide

Type:
Biaxial
RI values:
nα = 1.498 nγ = 1.513
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
very weak
Optical Extinction:
Positive elongation, parallel extinction

Chemical Properties of GiorgiositeHide

Formula:
Mg5(CO3)4(OH)2 · 5-6H2O
IMA Formula:
Mg5(CO3)4(OH)2 · 5H2O

Crystallography of GiorgiositeHide

Morphology:
Spherulitic growths in crusts

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.80 (30)
4.44 (40)
3.97 (40)
3.40 (100)
3.29 (70)
2.92 (60)
2.46 (40)

Type Occurrence of GiorgiositeHide

Place of Conservation of Type Material:
Natural History Museum, Paris, France.
Geological Setting of Type Material:
In white powdery crusts on lava.
Associated Minerals at Type Locality:

Other Language Names for GiorgiositeHide

German:Giorgiosit
Spanish:Giorgiosita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Brucite2 photos of Giorgiosite associated with Brucite on mindat.org.
Calcite1 photo of Giorgiosite associated with Calcite on mindat.org.

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.05HydromagnesiteMg5(CO3)4(OH)2 · 4H2OMon.
5.DA.05WidgiemoolthaliteNi5(CO3)4(OH)2 · 5H2OMon.
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 ?Mon.
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.
5.DA.45BrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2OHex.
5.DA.45ChlormagaluminiteMg4Al2(OH)12Cl2 · 3H2OHex.
5.DA.45Hydrotalcite-2HMg6Al2(CO3)(OH)16 · 4H2OHex.
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.

Related Minerals - Dana Grouping (8th Ed.)Hide

16b.7.2.1DypingiteMg5(CO3)4(OH)2 · 5H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

11.3.1MagnesiteMgCO3Trig. 3m (3 2/m) : R3c
11.3.2BarringtoniteMgCO3 · 2H2OTric.
11.3.3NesquehoniteMgCO3 · 3H2OMon. 2/m : P21/m
11.3.4LansforditeMgCO3 · 5H2OMon. 2/m : P21/b
11.3.5PokrovskiteMg2(CO3)(OH)2Mon.
11.3.6ArtiniteMg2(CO3)(OH)2 · 3H2OMon.
11.3.7HydromagnesiteMg5(CO3)4(OH)2 · 4H2OMon.
11.3.9DypingiteMg5(CO3)4(OH)2 · 5H2OMon.
11.3.10EiteliteNa2Mg(CO3)2Trig.
11.3.11Mcguinnessite(Mg,Cu)2(CO3)(OH)2

Other InformationHide

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 GiorgiositeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Fouqué (1879) Santorin e ses éruptions, Paris: 211.
Lacroix (1905) Bulletin de la Société française de Minéralogie: 28: 198.
Lacroix (1905) Comptes rendu de l’Académie des sciences de Paris: 140: 1308.
Zambonini (1922) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: II: 134.
Caillère (1943) Bulletin de la Société française de Minéralogie: 66: 54.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 274.
Raade, G. (1970): Dypingite, a new hydrous basic carbonate of magnesium, from Norway. American Mineralogist, 55, 1457-1465. [with comments on giorgiosite].
Friedel, B. (1975): Synthetischer Giorgiosit. Neues Jahrbuch für Mineralogie, Monatshefte, 196–208 (in German with English abs.).
Canterford, J.H., Tsambourakis, G. and Lambert, B. (1984): Some observations on the properties of dypingite, Mg5(CO3)4(OH)2•5H2O and related minerals. Mineral. Mag., 48, 437–442.

Internet Links for GiorgiositeHide

Localities for GiorgiositeHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
Australia
 
  • Tasmania
    • West Coast municipality
      • Zeehan district
        • Dundas mineral field
R Bottrill & R Woolley, unpublished data 2017
Canada
 
  • Yukon
    • Dawson Mining District
[Mineralogical Record - Vol 23 No.4, pp 37]
Germany
 
  • North Rhine-Westphalia
    • Siegerland
      • Eiserfeld
Henrich, M. (2008): Neues von der Grube Eisenzecher Zug. Mineralien-Welt 19 (5), 16-25.
Greece (TL)
 
  • Aegean Islands Department (Aiyaíon)
    • Kykládes Prefecture
      • Cyclade Islands (Cyclades; Kikladhes; Nomos Kikladhon)
        • Santorini Island (Thera)
          • Santorini Caldera
            • Nea Kammeni Island
NJMM (1975), 196
Italy
 
  • Sardinia
    • Sassari Province
      • Sassari
Ara D., Sanna L., Rossi A., Galli E., De Waele J. (2013): Minerali secondari in ambiente sotterraneo: la miniera dell’Argentiera (Sardegna nord-occidentale). In: Cucchi F., Gudi P. (eds.), Atti del XXI Congresso Nazionale di Speleologia “Diffusione delle conoscenze”, Sessione Attività di esplorazione e ricerca. Trieste 2-5 giugno 2011. Edizioni Università di Trieste, Trieste, 290-295.
  • Trentino-Alto Adige (Trentino-Südtirol)
    • Trento Province
      • Lagarina Valley
        • Ala
          • Pilcante
Giorgio Bortolozzi collection (IR analysis)
        • Terragnolo Valley
          • Terragnolo
            • Borcola Pass
Zordan A. (2014): Provincia di Vicenza. In: Zorzi F., Boscardin M. (eds.), Minerali del Veneto. Alla scoperta sei tesori della nostra regione. Museo di Storia Naturale e Archeologia di Montebelluna - Treviso, Cierre Edizioni, Sommacampagna, 173-246.
  • Tuscany
    • Livorno Province
      • Campigliese (Campiglia Mountains; Campiglia Ridge)
        • Campiglia Marittima
Biagioni, C., Orlandi, P., Cerri, M., Pistolesi, M., Rapaccini, S. & Santucci, A. (2013). Temperino e Lanzi. Le paragenesi secondarie dello skarn. Rivista Mineralogica Italiana, 1/2013, 40-55.
  • Veneto
    • Vicenza Province
      • Posina
        • Borcola Pass
Zordan A., Boscardin M. - Aggiornamenti di Mineralogia nel Vicentino. Determinazioni 2006. Studi e Ricerche - Associazione Amici del Museo Civico "G.Zannato", Montecchio Maggiore (Vicenza), 13 (2006), pp. 35-40.
        • Pasubio Massif
          • Punta della Lucche
Zordan A., Boscardin M. - Aggiornenti di mineralogia nel Vicentino. Determinazioni 2006. Studi e Ricerche - Associazione Amici del Museo - Museo Civico "G.Zannato", Montecchio Maggiore (Vicenza), 13 (2006),pp.35-40.
Norway
 
  • Sogn og Fjordane
    • Fjaler
      • Hellevika
Raade, G. (1993): Giorgsite, dypingite and nesquehonite from Sunnfjord. In: Interne notater 1990-1993, Mineralogisk-Geologisk Museum- Universitetet i Oslo. Utgitt av Geologisk Museums Venner 1993, p. 188-189. [Not officially published]
Russia
 
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
Cesnokov, B., Kotrly, M. and Nisanbajev, T. (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German).
USA
 
  • Pennsylvania
    • Carbon Co.
Yale Peabody Museum
Mineral and/or Locality  
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