Giorgiosite
A valid IMA mineral species - grandfathered - questionable
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About Giorgiosite
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).
Compare hydromagnesite (lower hydrate), dypingite (similar), and 'UM1973-06-CO:MgH' (higher hydrate).
Unique Identifiers
Mindat ID:
1697
Long-form identifier:
mindat:1:1:1697:7
IMA Classification of Giorgiosite
Approved, 'Grandfathered' (first described prior to 1959), Questionable
IMA Formula:
Mg5(CO3)4(OH)2·5H2O
Classification of Giorgiosite
5.DA.05
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
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
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
7 : Miscellaneous
11.3.8
11 : Carbonates
3 : Carbonates of Mg
11 : Carbonates
3 : Carbonates of Mg
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Gio | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Giorgiosite
Silky
Transparency:
Translucent
Colour:
White
Density:
2.170(15) g/cm3 (Measured)
Comment:
Synthetic
Optical Data of Giorgiosite
Type:
Biaxial
RI values:
nα = 1.498 nγ = 1.513
Max. Birefringence:
δ = 0.015
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
very weak
Optical Extinction:
Positive elongation, parallel extinction
Chemistry of Giorgiosite
Mindat Formula:
Mg5(CO3)4(OH)2 · 5-6H2O
Element Weights:
Elements listed:
Crystallography of Giorgiosite
Morphology:
Spherulitic growths in crusts
Comment:
Point Group: n.d. ; Space Group: n.d. Z = n.d.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.80 Å | (30) |
| 4.44 Å | (40) |
| 3.97 Å | (40) |
| 3.40 Å | (100) |
| 3.29 Å | (70) |
| 2.92 Å | (60) |
| 2.46 Å | (40) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 54 : Coal and other mine fire minerals (see also #51 and #56) | |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Giorgiosite
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 Giorgiosite
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 5.DA. | Alexkhomyakovite | K6(Ca2Na)(CO3)5Cl · 6H2O |
| 5.DA. | Amoraite | Ca12Al6(OH)36(CO3)2(SO3) · 15H2O |
| 5.DA.05 | Dypingite | Mg5(CO3)4(OH)2 · 5H2O |
| 5.DA.05 | 'UM1986-10-CO:ClHMgMnZn (also called Mineral F, Dunn, 1995)' | Mg5(Zn,Mn)3(CO3)2(OH,Cl)12 · H2O |
| 5.DA.05 | 'UM1987-01-CO:HMgS' | Mg4(CO3)2(OH)4 · 6H2O ? |
| 5.DA.05 | Hydromagnesite | Mg5(CO3)4(OH)2 · 4H2O |
| 5.DA.05 | Widgiemoolthalite | Ni5(CO3)4(OH)2 · 5H2O |
| 5.DA.10 | Artinite | Mg2(CO3)(OH)2 · 3H2O |
| 5.DA.10 | Chlorartinite | Mg2(CO3)(OH)Cl · 2H2O |
| 5.DA.10 | Indigirite | Mg2Al2(CO3)4(OH)2 · 15H2O |
| 5.DA.15 | Zaratite | Ni3(CO3)(OH)4 · 4H2O ? |
| 5.DA.15 | Otwayite | Ni2(CO3)(OH)2 · H2O |
| 5.DA.20 | Kambaldaite | NaNi4(CO3)3(OH)3 · 3H2O |
| 5.DA.25 | Callaghanite | Cu2Mg2(CO3)(OH)6 · 2H2O |
| 5.DA.30 | Claraite | (Cu,Zn)15(CO3)4(AsO4)2(SO4)(OH)14 · 7H2O |
| 5.DA.35 | Hydroscarbroite | Al14(CO3)3(OH)36 · nH2O |
| 5.DA.35 | Scarbroite | Al5(CO3)(OH)13 · 5H2O |
| 5.DA.40 | Karchevskyite | Mg18Al9(OH)54Sr2(CO3)9(H2O)6(H3O)5 |
| 5.DA.40 | 'UM1987-05-OH:AlCMg' | Mg4Al2(OH)12(CO3,SO4) · 3H2O |
| 5.DA.40 | Quintinite | Mg4Al2(OH)12(CO3) · 3H2O |
| 5.DA.40 | Charmarite | Mn2+4Al2(OH)12[CO3] · 3H2O |
| 5.DA.40 | Caresite | Fe2+4Al2(OH)12[CO3] · 3H2O |
| 5.DA.45 | 'Hydrotalcite-2H' | Mg6Al2(CO3)(OH)16 · 4H2O |
| 5.DA.45 | 'Stichtite-2H' | Mg6(Cr,Al)2(CO3)(OH)16 · 4H2O |
| 5.DA.45 | Brugnatellite | Mg6Fe3+(CO3)(OH)13 · 4H2O |
| 5.DA.45 | Zaccagnaite | Zn4Al2(OH)12[CO3] · 3H2O |
| 5.DA.45 | 'Pyroaurite-2H' | Mg6Fe3+2(OH)16(CO3) · 4H2O |
| 5.DA.45 | Liudongshengite | Zn4Cr2(OH)12(CO3) · 3H2O |
| 5.DA.45 | Chlormagaluminite | Mg4Al2(OH)12Cl2 · 3H2O |
| 5.DA.50 | Pyroaurite | Mg6Fe3+2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Takovite | Ni6Al2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Reevesite | Ni6Fe3+2(OH)16(CO3) · 4H2O |
| 5.DA.50 | Kaznakhtite | Ni6Co3+2(CO3)(OH)16 · 4H2O |
| 5.DA.50 | Comblainite | Ni4Co2(OH)12[CO3] · 3H2O |
| 5.DA.50 | Marioantofilliite | [Cu4Al2(OH)12](CO3) · 3H2O |
| 5.DA.50 | Hydrotalcite | Mg6Al2(CO3)(OH)16 · 4H2O |
| 5.DA.50 | Stichtite | Mg6Cr3+2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Desautelsite | Mg6Mn3+2(OH)16[CO3] · 4H2O |
| 5.DA.55 | Coalingite | Mg10Fe3+2(OH)24[CO3] · 2H2O |
| 5.DA.55 | Akopovaite | Al4Li2(OH)12(CO3)(H2O)3 |
| 5.DA.60 | Šlikite | Zn2Mg(CO3)2(OH)2 · 4H2O |
| 5.DA.65 | Marklite | Cu5(CO3)2(OH)6 · 6H2O |
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.
Internet Links for Giorgiosite
mindat.org URL:
https://www.mindat.org/min-1697.html
Please feel free to link to this page.
Please feel free to link to this page.
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Mineral Dealers:
References for Giorgiosite
Reference List:
Caillère, Simonne (1943) Contribution à l'étude de l'hydromagnésite et de quelques autres hydrocarbonates magnésiens : l'hydrogiobertite, l'hydrodolomite et la giorgiosite. Bulletin de la Société française de Minéralogie, 66 (1). 55-70 doi:10.3406/bulmi.1943.4525
Raade, Gunnar (1970) Dypingite, a new hydrous basic carbonate of magnesium, from Norway. American Mineralogist, 55 (9-10) 1457-1465
Localities for Giorgiosite
Showing 17 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Australia | |
| R Bottrill & R Woolley |
Canada | |
| Robinson et al. (1992) |
Germany | |
| Henrich (2008) |
| Gerhard Möhn collection |
| Gerhard Möhn collection |
Greece (TL) | |
| Lacroix (1905) +1 other reference |
Italy | |
| Ara D. et al. (2013) |
| Bortolozzi (n.d.) |
| Zordan A. (2014) |
| Biagioni et al. (2013) |
| Zordan A. et al. (Vicenza) |
| Zordan A. et al. (Vicenza) |
New Zealand | |
| Andrew Hodgson collection ... |
Norway | |
| Raade (1993) |
Russia | |
| Cesnokov et al. (1998) |
| Gerhard Möhn Collection Analyzed by ... |
USA | |
| Yale Peabody Museum |
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Roding River, Aniseed Valley, Nelson Region, New Zealand