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Riomarinaite Mineral Data
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General Riomarinaite Information
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 Chemical Formula: |
Bi(OH)SO4•H2O |
| Composition: |
Molecular Weight = 345.49 gm |
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Bismuth 61.70 % Bi 68.78 % Bi2O3 |
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Hydrogen 0.77 % H 6.88 % H2O |
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Sulfur 9.75 % S 24.33 % SO3 |
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Oxygen 27.79 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Bi1.02H2.64S1.05O6 |
| Environment: |
Occurs on weathered and corroded pyrite probably derived from the breakdown of primary bismuthinite and cosalite. Second natural bismuth sulfate. |
| IMA Status: |
Approved IMA 2000 (Dana # Added) |
| Locality: |
Falcacci mine, Rio Marina iron mine, Elba Island, Toscana (Tuscany), Italy Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality |
| Synonym: |
IMA2000-004 |
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Riomarinaite Crystallography
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| Axial Ratios: |
a:b:c =0.4508:1:0.4863 |
| Cell Dimensions: |
a = 6.0118, b = 13.3355, c = 6.4854, Z = 4; beta = 112.91° V = 478.92 Den(Calc)= 4.79 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n |
| X Ray Diffraction: |
By Intensity(I/Io): 4.2598(1)(120 ), 3.335(0.42)(111,040 )5.453(0.42)(011 ),5.1152(0.37)(110 3.1127(0.36)(112 5.1926(0.32)(101 2.7239(0.22)(131 2.9151(0.22)(2
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Physical Properties of Riomarinaite
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| Cleavage: |
None |
| Color: |
Light beige, Light gray. |
| Diaphaneity: |
Translucent |
| Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
| Habit: |
Botryoidal - "Grape-like" rounded forms (e.g.. malachite). |
| Habit: |
Encrustations - Forms crust-like aggregates on matrix. |
| Hardness: |
2-3 - Gypsum-Calcite |
| Luster: |
Vitreous (Glassy) |
| Streak: |
light gray |
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Optical Properties of Riomarinaite
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| Gladstone-Dale: |
CI calc= 0.052 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1628,KC= 0.1717
Ncalc = 1.82 |
| Optical Data: |
Biaxial (?), a=1.78 |
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Calculated Properties of Riomarinaite
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| Electron Density: |
Bulk Density (Electron Density)=4.22 gm/cc
note: Specific Gravity of Riomarinaite =4.79 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0008660546
Boson Index = 0.9991339454 |
| Photoelectric: |
PERiomarinaite =1,128.38 barns/electron
U=PERiomarinaite x rElectron Density=4,759.02 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Riomarinaite is Not Radioactive |
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Riomarinaite Classification
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| Dana Class: |
31.09.15.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen |
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(31.09)where (A+ B++) (XO4) Zq�x(H2O) |
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(31.09.15)Dana Group |
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31.09.15.01 Riomarinaite! Bi(OH)SO4•H2O P 21/n 2/m |
| Strunz Class: |
07.DF.75 07 - SULFATES (SELENATES, TELLURATES) |
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07.D - Sulfates (selenates, etc.) with additional anions, with H2O |
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07.DF -With large and medium-sized cations |
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07.DF.75 Riomarinaite! Bi(OH)SO4•H2O P 21/n 2/m |
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Other Riomarinaite Information
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| References: |
NAME( AmMin, v90, p1948) PHYS. PROP.(AmMin, v90, p1948) OPTIC PROP.(AmMin, v90, p1948) |
| See Also: |
Links to other databases for Riomarinaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Print or Cut-and-Paste your Riomarinaite Specimen Label here :
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Riomarinaite
Bi(OH)SO4•H2O
Dana No: 31.09.15.01 Strunz No: 07.DF.75
Locality:
Notes:
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