Gravegliaite Mineral Data

General Gravegliaite Information

Chemical Formula:

Mn++(SO3)•3(H2O)

Composition:

Molecular Weight = 233.00 gm

Manganese 42.44 % Mn 54.80 % MnO

Hydrogen 2.60 % H 23.20 % H₂O

Sulfur 13.76 % S 27.50 % SO₂

Oxygen 41.20 % O

______ ______

100.00 % 105.49 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_1.8(SO₃)•3(H₂O)

Environment:

Fractures in metamorphosed manganiferous layers in radiolarian cherts in an ophiolite sequence.

IMA Status:

Approved IMA 1991

Locality:

Gambatesa mine, near Reppia, Val Graveglia, Liguria, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Gravegliaite + Pronunciation

Synonym:

ICSD 33945

IMA1990-020

PDF 44-1445

Gravegliaite Image

Images:

Gravegliaite

Comments: Pale brownish prismatic crystals of gravegliaite on matrix.
Location: Gambatesa Mine, Val Graveglia, Genova, Liguria, Italy. Scale: Picture Size 1 mm.
© Thomas Witzke

Gravegliaite Crystallography

Axial Ratios:

a:b:c =1.7325:1:1.6961

Cell Dimensions:

a = 9.763, b = 5.635, c = 9.558, Z = 4; V = 525.83 Den(Calc)= 2.94

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma

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

By Intensity(I/I_o): 6.83(1), 4.33(0.98), 2.704(0.51),

Physical Properties of Gravegliaite

Cleavage:

{010} Good

Color:

Colorless.

Density:

2.39

Diaphaneity:

Transparent

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Gravegliaite

Gladstone-Dale:

CI meas= 0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.202 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2066,KPDmeas= 0.2541,KC= 0.2589
Ncalc = 1.62 - 1.76

Optical Data:

Biaxial (+), a=1.59, b=1.596, g=1.636, bire=0.0460, 2V(Calc)=44, 2V(Meas)=41-43.

Calculated Properties of Gravegliaite

Electron Density:

Bulk Density (Electron Density)=2.36 gm/cc
note: Specific Gravity of Gravegliaite =2.39 gm/cc.

Fermion Index:

Fermion Index = 0.0012338293
Boson Index = 0.9987661707

Photoelectric:

PE_Gravegliaite= 11.48 barns/electron
U=PE_Gravegliaite x rElectron Density= 27.09 barns/cc.

Radioactivity:

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

Gravegliaite Classification

Dana Class:

34.02.05.02 (34)Selenites - Tellurites - Sulfites

(34.02)as A++ XO3 ï¿½ x(H2O)

(34.02.05)Dana Group

34.02.05.01 Hannebachite 2CaSO3•(H2O) Pbna 2/m 2/m 2/m

34.02.05.02 Gravegliaite Mn(SO3)•3(H2O) P nma 2/m 2/m 2/m

Strunz Class:

04.JE.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.J - Arsenites, Antimonites, Bismuthites, Sulfites,

04.JE -Sulfites

04.JE.05 Gravegliaite Mn(SO3)•3(H2O) P nma 2/m 2/m 2/m

Other Gravegliaite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(37th List of New Min.,Min. Mag.,1990)

See Also:

Links to other databases for Gravegliaite :
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 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

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Print or Cut-and-Paste your Gravegliaite Specimen Label here :

Gravegliaite

Mn++(SO3)•3(H2O)
Dana No: 34.02.05.02 Strunz No: 04.JE.05
Locality:

Notes:

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