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Romarchite Mineral Data
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General Romarchite Information
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Chemical Formula: |
SnO |
Composition: |
Molecular Weight = 134.71 gm |
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Tin 88.12 % Sn 100.00 % SnO |
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Oxygen 11.88 % O |
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______ ______ |
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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 |
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IMA1969-006 |
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PDF 6-395 |
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Romarchite Image |
Images:
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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 Anne’s Revenge (A.D. 1718).
Scale: Scale Bar 30 µm.
© Geoarchaeology |
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Romarchite Crystallography
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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 |
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), |
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Physical Properties of Romarchite
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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 |
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Optical Properties of Romarchite
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Optical Data: |
NCalc= 1.9 - from Gladstone-Dale relationship (KC = 0.14) where Ncalc=Dcalc*KC+1 |
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Calculated Properties of Romarchite
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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: |
PERomarchite = 281.75 barns/electron U=PERomarchite x rElectron Density=1,552.78 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Romarchite is Not Radioactive |
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Romarchite Classification
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Dana Class: |
04.02.05.01 (04)Simple Oxides |
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(04.02)with a cation charge of 2+ (A++ O) |
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(04.02.05)Dana Group |
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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 |
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04.A - Metal:Oxygen = 2.1 and 1:1 |
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04.AC -M:O = 1:1 (and up to 1:1.25); with large cations (� smaller ones) |
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04.AC.20 Litharge PbO P 4/nmm 4/m 2/m 2/m |
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04.AC.20 Romarchite SnO P 4/nmm 4/m 2/m 2/m |
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Other Romarchite Information
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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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