Mineralogy Database

Romarchite Mineral Data

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General Romarchite Information

Help on Chemical  Formula: Chemical Formula: SnO
Help on Composition: Composition: Molecular Weight = 134.71 gm
   Tin     88.12 %  Sn  100.00 % SnO
   Oxygen  11.88 %  O
          ______        ______ 
          100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: SnO
Help on Environment: Environment: Alteration product on pewter (tin) objects and found on veins containing native tin.
Help on IMA Status: IMA Status: Approved IMA 1971
Help on Locality: Locality: Tin cooking utensils submerged since 1830 in the Winnipeg River at Boundary Falls, Manitoba, Canada. Link to MinDat.org Location Data.
Help on Name Origin: 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.
Help on Name Pronunciation: Name Pronunciation: Romarchite + Pronunciation Say ROMARCHITE
Help on Synonym: Synonym: ICSD 16481
  PDF 6-395

Romarchite Image

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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 Anne’s Revenge (A.D. 1718). Scale: Scale Bar 30 µm.
© Geoarchaeology

Romarchite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.27196
Help on Cell Dimensions: Cell Dimensions: a = 3.802, c = 4.836, Z = 2; V = 69.91 Den(Calc)= 6.40
Help on Crystal System: 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/Io): 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

Help on Color: Color: Black.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail

Optical Properties of Romarchite

Help on Optical Data: Optical Data: NCalc= 1.9 - from Gladstone-Dale relationship (KC = 0.14) where Ncalc=Dcalc*KC+1

Calculated Properties of Romarchite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.51 gm/cc
note: Specific Gravity of Romarchite =6.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.14
Boson Index = 0.86
Help on Photoelectric: Photoelectric: PERomarchite = 281.75 barns/electron
U=PERomarchite x rElectron Density=1,552.78 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Romarchite is Not Radioactive

Romarchite Classification

Help on  Dana Class: Dana Class: (04)Simple Oxides
  (04.02)with a cation charge of 2+ (A++ O)
  (04.02.05)Dana Group Romarchite SnO P 4/nmm 4/m 2/m 2/m
Help on  Strunz Class: 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 (� 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8)
Help on See Also: 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

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Dana No: Strunz No: 04.AC.20





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