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Giorgiosite Mineral Data
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General Giorgiosite Information
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 Chemical Formula: |
Mg5(CO3)4(OH)2•5(H2O) |
| Composition: |
Molecular Weight = 485.65 gm |
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Magnesium 25.02 % Mg 41.50 % MgO |
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Hydrogen 2.49 % H 22.26 % H2O |
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Carbon 9.89 % C 36.25 % CO2 |
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Oxygen 62.59 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Mg5(CO3)4(OH)2•5(H2O) |
| Environment: |
Occurs on the lava. Metastable phase between nesquehonite and hydromagnesite. |
| IMA Status: |
Valid Species (Pre-IMA) 1905 |
| Locality: |
Alphroessa, Santorin, Greece. Link to MinDat.org Location Data. |
| Name Origin: |
Named for one of the cones, Giorgios, created during the eruption at Santorin islands in 1866. |
| Name Pronunciation: |
Giorgiosite + Pronunciation  |
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Giorgiosite Image |
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Images:
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Giorgiosite Crystallography
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| Crystal System: |
Monoclinic Space Group: ? |
| X Ray Diffraction: |
By Intensity(I/Io): 11.8(1), 3.28(0.7), 3.38(0.7), |
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Physical Properties of Giorgiosite
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| Color: |
White. |
| Density: |
2.155 - 2.185, Average = 2.17 |
| Habit: |
Encrustations - Forms crust-like aggregates on matrix. |
| Habit: |
Fibrous - Crystals made up of fibers. |
| Habit: |
Spherical - Spherical, rounded aggregates. |
| Streak: |
white |
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Optical Properties of Giorgiosite
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| Gladstone-Dale: |
CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2329,KC= 0.2351
Ncalc = 1.51 |
| Optical Data: |
Biaxial (?), a=1.498, g=1.513, bire=0.0150 |
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Calculated Properties of Giorgiosite
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| Electron Density: |
Bulk Density (Electron Density)=2.22 gm/cc
note: Specific Gravity of Giorgiosite =2.17 gm/cc.
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| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PEGiorgiosite = 0.75 barns/electron
U=PEGiorgiosite x rElectron Density= 1.67 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Giorgiosite is Not Radioactive |
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Giorgiosite Classification
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| Dana Class: |
16b.07.02.02 (16b)Carbonates - Hydroxyl or Halogen |
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(16b.07)Dana Type |
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(16b.07.02)Dana Group |
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16b.07.02.01 Dypingite Mg5(CO3)4(OH)2•5(H2O) Unk. Mono |
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16b.07.02.02 Giorgiosite Mg5(CO3)4(OH)2•5(H2O) ? Mono |
| Strunz Class: |
05.DA.05 05 - CARBONATES (NITRATES) |
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05.D - Carbonates with Additional Anions, with H2O |
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05.DA -With medium-sized cations |
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05.DA.05 Dypingite Mg5(CO3)4(OH)2•5(H2O) Unk. Mono |
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05.DA.05 Giorgiosite Mg5(CO3)4(OH)2•5(H2O) ? Mono |
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05.DA.05 Hydromagnesite Mg5(CO3)4(OH)2•4(H2O) P 21/c 2/m |
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05.DA.05 Widgiemoolthalite (Ni,Mg)5(CO3)4(OH)2•4-5(H2O) P 21/c 2/m |
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Other Giorgiosite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
| See Also: |
Links to other databases for Giorgiosite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Print or Cut-and-Paste your Giorgiosite Specimen Label here :
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Giorgiosite
Mg5(CO3)4(OH)2•5(H2O)
Dana No: 16b.07.02.02 Strunz No: 05.DA.05
Locality:
Notes:
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