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Giorgiosite

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Borcola Pass Quarry, Borcola Pass, Posina, Vicenza Province, Veneto, Italy

Show Giorgiosite Photos (3)



Formula:
Mg
 
5
(CO
 
3
)
 
4
(OH)
 
2
 · 5-6H
 
2
O
Colour:White
Name:For Giorgios, a volcanic cone on the island of Thera formed in 1866.


Inadequately described.
Compare hydromagnesite.

Classification of Giorgiosite

IMA status:Questionable/Doubtful
Strunz 8th edition ID:5/E.01-30
Nickel-Strunz 10th (pending) edition ID:5.DA.05

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
Dana 8th edition ID:16b.7.2.2

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
7 : Miscellaneous
Hey's CIM Ref.:11.3.8

11 : Carbonates
3 : Carbonates of Mg
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Type Occurrence of Giorgiosite

Type Locality:Alphoessa (Aphroessa; Afroessa) lava flow, Nea Kammeni Island, Santorini Caldera, Santorini Island (Thera), Cyclade Islands (Cyclades; Kikladhes; Nomos Kikladhon), Kykládes Prefecture, Aegean Islands (Aiyaíon) Department, Greece
Place of Conservation of Type Material:Natural History Museum, Paris, France.
Year of Discovery:1879
Geological Setting of type material:In white powdery crusts on lava.
Associated Minerals at type locality:
MagnesiteHalite

Physical Properties of Giorgiosite

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

Crystallography of Giorgiosite

Morphology:Spherulitic growths in crusts

Optical Data of Giorgiosite

Type:Biaxial
RI values: nα = 1.498 nγ = 1.513
Maximum Birefringence:δ = 0.015

Chart 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 Giorgiosite

Formula:
Mg
 
5
(CO
 
3
)
 
4
(OH)
 
2
 · 5-6H
 
2
O
Essential elements:C, H, Mg, O
All elements listed in formula:C, H, Mg, O

Relationship of Giorgiosite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
5.DA.05Dypingite
Mg
 
5
(CO
 
3
)
 
4
(OH)
 
2
 · 5H
 
2
O
5.DA.05Hydromagnesite
Mg
 
5
(CO
 
3
)
 
4
(OH)
 
2
 · 4H
 
2
O
5.DA.05Widgiemoolthalite
Ni
 
5
(CO
 
3
)
 
4
(OH)
 
2
 · 5H
 
2
O
5.DA.05UM1986-10-CO:ClHMgMnZn
Mg
 
5
(Zn,Mn)
 
3
(CO
 
3
)
 
2
(OH,Cl)
 
12
 · H
 
2
O
5.DA.05UM1987-01-CO:HMgS
Mg
 
4
(CO
 
3
)
 
2
(OH)
 
2
 · 6H
 
2
O ?
5.DA.10Artinite
Mg
 
2
(CO
 
3
)(OH)
 
2
 · 3H
 
2
O
5.DA.10Indigirite
Mg
 
2
Al
 
2
(CO
 
3
)
 
4
(OH)
 
2
 · 15H
 
2
O
5.DA.10Chlorartinite
Mg
 
2
(CO
 
3
)(OH)Cl · 2H
 
2
O
5.DA.15Otwayite
Ni
 
2
(CO
 
3
)(OH)
 
2
 · H
 
2
O
5.DA.15Zaratite
Ni
 
3
(CO
 
3
)(OH)
 
4
 · 4H
 
2
O
5.DA.20Kambaldaite
NaNi
 
4
(CO
 
3
)
 
3
(OH)
 
3
 · 3H
 
2
O
5.DA.25Callaghanite
Cu
 
2
Mg
 
2
(CO
 
3
)(OH)
 
6
 · 2H
 
2
O
5.DA.30Claraite
(Cu,Zn)
 
3
(CO
 
3
)(OH)
 
4
 · 4H
 
2
O
5.DA.35Hydroscarbroite
Al
 
14
(CO
 
3
)
 
3
(OH)
 
36
 · nH
 
2
O
5.DA.35Scarbroite
Al
 
5
(CO
 
3
)(OH)
 
13
 · 5H
 
2
O
5.DA.40Caresite
Fe
2+
4
Al
 
2
(CO
 
3
)(OH)
 
12
 · 3H
 
2
O
5.DA.40Quintinite
Mg
 
4
Al
 
2
(CO
 
3
)(OH)
 
12
 · H
 
2
O
5.DA.40Charmarite
Mn
2+
4
Al
 
2
(CO
 
3
)(OH)
 
12
 · 3H
 
2
O
5.DA.45Barbertonite
Mg
 
6
(Cr,Al)
 
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
5.DA.45Brugnatellite
Mg
 
6
Fe
3+
 
(CO
 
3
)(OH)
 
13
 · 4H
 
2
O
5.DA.45Chlormagaluminite
(Mg,Fe
2+
 
)
 
4
Al
 
2
(Cl
 
2
,CO
 
3
)(OH)
 
12
 · 2H
 
2
O
5.DA.45Manasseite
Mg
 
6
Al
 
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
5.DA.45Sjögrenite
Mg
 
6
Fe
3+
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
5.DA.45Zaccagnaite
Zn
 
4
Al
 
2
(CO
 
3
)(OH)
 
12
 · 3H
 
2
O
5.DA.50Comblainite
Ni
 
6
Co
 
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
5.DA.50Desautelsite
Mg
 
6
Mn
3+
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
5.DA.50Hydrotalcite
Mg
 
6
Al
 
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
5.DA.50Pyroaurite
Mg
 
6
Fe
3+
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
5.DA.50Reevesite
Ni
 
6
Fe
3+
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
5.DA.50Stichtite
Mg
 
6
Cr
 
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
5.DA.50Takovite
Ni
 
6
Al
 
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
5.DA.50UM1998-10-CO:CoHNi
Co
 
6
Fe
 
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O ?
5.DA.55Coalingite
Mg
 
10
Fe
3+
2
(CO
 
3
)(OH)
 
24
 · 2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
11.3.1Magnesite
MgCO
 
3
11.3.2Barringtonite
MgCO
 
3
 · 2H
 
2
O
11.3.3Nesquehonite
MgCO
 
3
 · 3H
 
2
O
11.3.4Lansfordite
MgCO
 
3
 · 5H
 
2
O
11.3.5Pokrovskite
Mg
 
2
(CO
 
3
)(OH)
 
2
11.3.6Artinite
Mg
 
2
(CO
 
3
)(OH)
 
2
 · 3H
 
2
O
11.3.7Hydromagnesite
Mg
 
5
(CO
 
3
)
 
4
(OH)
 
2
 · 4H
 
2
O
11.3.9Dypingite
Mg
 
5
(CO
 
3
)
 
4
(OH)
 
2
 · 5H
 
2
O
11.3.10Eitelite
Na
 
2
Mg(CO
 
3
)
 
2
11.3.11Mcguinnessite
(Mg,Cu)
 
2
(CO
 
3
)(OH)
 
2

Other Names for Giorgiosite

Other Languages:
German:Giorgiosit
Spanish:Giorgiosita

Other Information

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

References for Giorgiosite

Reference List:

- +
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.

Neues Jahrbuch für Mineralogie, Monatshefte (1975): 196.

Internet Links for Giorgiosite

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    • Localities for Giorgiosite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? 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.
    Canada
     
    • Yukon Territory
      • 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
     
    • Aegean Islands (Aiyaíon) Department
      • Kykládes Prefecture
        • Cyclade Islands (Cyclades; Kikladhes; Nomos Kikladhon)
          • Santorini Island (Thera)
            • Santorini Caldera
              • Nea Kammeni Island
    		NJMM (1975), 196
    Italy
     
    • 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.
          • Mt. Pasubio
    		 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
    		Pers. Commentary Gunnar Raade May 1993
    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
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