Giorgiosite Mineral Data

Giorgiosite Mineral Data +

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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.

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:

MonoclinicSpace 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

Optical Data:

Biaxial (?), a=1.498, g=1.513, bire=0.0150

Calculated Properties of Giorgiosite

Electron Density:

r_electron=2.22 gm/cc
note: r_Giorgiosite=2.17 gm/cc.

Fermion Index

Fermion Index = 0.02641
Boson Index = 0.97359

Photoelectric:

PE_Giorgiosite= 0.75 barns/electron
U=PE_Giorgiosite x r_electron= 1.67 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Giorgiosite is Not Radioactive

Giorgiosite Classification

Dana Class:

16b.7.2.2 (16b)Carbonates - Hydroxyl or Halogen

(16b.7)Dana Type

(16b.7.2)Dana Group

16b.7.2.1 Dypingite Mg5(CO3)4(OH)2·5(H2O) Unk. Mono

16b.7.2.2 Giorgiosite Mg5(CO3)4(OH)2·5(H2O) ? Mono

Strunz Class:

V/E.01-30 V - Nitrates, Carbonates and Borates

V/E - Water-bearing carbonates with unfamiliar anions

V/E.01 - Hydromagnesite - Brugnatellite series

V/E.01-10 Hydromagnesite Mg5(CO3)4(OH)2·4(H2O) P 2₁/c 2/m

V/E.01-15 Widgiemoolthalite (Ni,Mg)5(CO3)4(OH)2·4-5(H2O) P 2₁/c 2/m

V/E.01-20 Dypingite Mg5(CO3)4(OH)2·5(H2O) Unk. Mono

V/E.01-30 Giorgiosite Mg5(CO3)4(OH)2·5(H2O) ? Mono

V/E.01-40 Artinite Mg2(CO3)(OH)2·3(H2O) C 2 or C 2/m Mono

V/E.01-50 Indigirite Mg2Al2(CO3)4(OH)2·15(H2O) Unk. Mono

V/E.01-60 Coalingite Mg10Fe2(CO3)(OH)24·2(H2O) R 3c 3 2/m

V/E.01-70 Brugnatellite Mg6Fe(CO3)(OH)13·4(H2O) P 6₃/mmc 6/m 2/m 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Translate Giorgiosite Mineral Data :

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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.7.2.2 Strunz No: V/E.01-30
Locality:

Notes: