Romarchite Mineral Data

General Romarchite Information

Chemical Formula:

SnO

Composition:

Molecular Weight = 134.71 gm

Tin 88.12 % Sn 100.00 % SnO

Oxygen 11.88 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

SnO

Environment:

Alteration product on pewter (tin) objects and found on veins containing native tin.

IMA Status:

Approved IMA 1971

Locality:

Tin cooking utensils submerged since 1830 in the Winnipeg River at Boundary Falls, Manitoba, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for the initials of the Royal Ontario Museum (ROM), where the mineral was identified and for ARCHaeology because it was found on tin artifacts.

Name Pronunciation:

Romarchite + Pronunciation

Synonym:

ICSD 16481

IMA1969-006

PDF 6-395

Romarchite Image

Images:

Romarchite

Comments: SEM photograph of romarchite precipitating on quartz sand grains on the surface of a pewter artifact. (Geoarchaeology, 19:538).
Location: Wreck of the Queen Anneâ€™s Revenge (A.D. 1718). Scale: Scale Bar 30 µm.
© Geoarchaeology

Romarchite Crystallography

Axial Ratios:

a:c = 1:1.27196

Cell Dimensions:

a = 3.802, c = 4.836, Z = 2; V = 69.91 Den(Calc)= 6.40

Crystal System:

Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/nmm

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

By Intensity(I/I_o): 2.99(1), 2.69(0.4), 1.8(0.3),1.6(0.3), 1.48(0.1), 1.49(0.1), 1.9(0.1), 2.42(0.1),

Physical Properties of Romarchite

Color:

Black.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

2-2.5 - Gypsum-Finger Nail

Optical Properties of Romarchite

Optical Data:

NCalc= 1.9 - from Gladstone-Dale relationship (KC = 0.14) where Ncalc=Dcalc*KC+1

Calculated Properties of Romarchite

Electron Density:

Bulk Density (Electron Density)=5.51 gm/cc
note: Specific Gravity of Romarchite =6.40 gm/cc.

Fermion Index:

Fermion Index = 0.14
Boson Index = 0.86

Photoelectric:

PE_Romarchite= 281.75 barns/electron
U=PE_Romarchite x rElectron Density=1,552.78 barns/cc.

Radioactivity:

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

Romarchite Classification

Dana Class:

04.02.05.01 (04)Simple Oxides

(04.02)with a cation charge of 2+ (A++ O)

(04.02.05)Dana Group

04.02.05.01 Romarchite SnO P 4/nmm 4/m 2/m 2/m

Strunz Class:

04.AC.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.A - Metal:Oxygen = 2.1 and 1:1

04.AC -M:O = 1:1 (and up to 1:1.25); with large cations (ï¿½ smaller ones)

04.AC.20 Litharge PbO P 4/nmm 4/m 2/m 2/m

04.AC.20 Romarchite SnO P 4/nmm 4/m 2/m 2/m

Other Romarchite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8)

See Also:

Links to other databases for Romarchite :
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
15 - WWW-MINCRYST

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

Romarchite

SnO
Dana No: 04.02.05.01 Strunz No: 04.AC.20
Locality:

Notes:

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