Giorgiosite Mineral Data

General Giorgiosite Information

Chemical Formula:

Mg5(CO3)4(OH)2•5(H2O)

Composition:

Molecular Weight = 485.65 gm

Magnesium 25.02 % Mg 41.50 % MgO

Hydrogen 2.49 % H 22.26 % H₂O

Carbon 9.89 % C 36.25 % CO₂

Oxygen 62.59 % O

______ ______

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

Giorgiosite Image

Images:

Giorgiosite

Comments: Opaque white nodular giorgiosite.
Location: Alphroessa, Santorini (Thira) Island, Notion Aiyalon, Greece. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Giorgiosite Crystallography

Crystal System:

Monoclinic Space Group: ?

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 11.8(1), 3.28(0.7), 3.38(0.7),

Physical Properties of Giorgiosite

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

Optical Properties of Giorgiosite

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

Calculated Properties of Giorgiosite

Electron Density:

Bulk Density (Electron Density)=2.22 gm/cc
note: Specific Gravity of Giorgiosite =2.17 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Giorgiosite= 0.75 barns/electron
U=PE_Giorgiosite x rElectron Density= 1.67 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Giorgiosite is Not Radioactive

Giorgiosite Classification

Dana Class:

16b.07.02.02 (16b)Carbonates - Hydroxyl or Halogen

(16b.07)Dana Type

(16b.07.02)Dana Group

16b.07.02.01 Dypingite Mg5(CO3)4(OH)2•5(H2O) Unk. Mono

16b.07.02.02 Giorgiosite Mg5(CO3)4(OH)2•5(H2O) ? Mono

Strunz Class:

05.DA.05 05 - CARBONATES (NITRATES)

05.D - Carbonates with Additional Anions, with H2O

05.DA -With medium-sized cations

05.DA.05 Dypingite Mg5(CO3)4(OH)2•5(H2O) Unk. Mono

05.DA.05 Giorgiosite Mg5(CO3)4(OH)2•5(H2O) ? Mono

05.DA.05 Hydromagnesite Mg5(CO3)4(OH)2•4(H2O) P 2₁/c 2/m

05.DA.05 Widgiemoolthalite (Ni,Mg)5(CO3)4(OH)2•4-5(H2O) P 2₁/c 2/m

Other Giorgiosite Information

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 :

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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