Mineralogy Database

Riomarinaite Mineral Data

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General Riomarinaite Information

Help on Chemical  Formula: Chemical Formula: Bi(OH)SO4•H2O
Help on Composition: Composition: Molecular Weight = 345.49 gm
   Bismuth   61.70 %  Bi   68.78 % Bi2O3
   Hydrogen   0.77 %  H     6.88 % H2O
   Sulfur     9.75 %  S    24.33 % SO3
   Oxygen    27.79 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Bi1.02H2.64S1.05O6
Help on Environment: Environment: Occurs on weathered and corroded pyrite probably derived from the breakdown of primary bismuthinite and cosalite. Second natural bismuth sulfate.
Help on IMA Status: IMA Status: Approved IMA 2000 (Dana # Added)
Help on Locality: Locality: Falcacci mine, Rio Marina iron mine, Elba Island, Toscana (Tuscany), Italy Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality
Help on Synonym: Synonym: IMA2000-004

Riomarinaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4508:1:0.4863
Help on Cell Dimensions: Cell Dimensions: a = 6.0118, b = 13.3355, c = 6.4854, Z = 4; beta = 112.91° V = 478.92 Den(Calc)= 4.79
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: 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

Physical Properties of Riomarinaite

Help on Cleavage: Cleavage: None
Help on Color: Color: Light beige, Light gray.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light gray

Optical Properties of Riomarinaite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.052 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1628,KC= 0.1717
Ncalc = 1.82
Help on Optical Data: Optical Data: Biaxial (?), a=1.78

Calculated Properties of Riomarinaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.22 gm/cc
note: Specific Gravity of Riomarinaite =4.79 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0008660546
Boson Index = 0.9991339454
Help on Photoelectric: Photoelectric: PERiomarinaite =1,128.38 barns/electron
U=PERiomarinaite x rElectron Density=4,759.02 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Riomarinaite is Not Radioactive

Riomarinaite Classification

Help on  Dana Class: Dana Class: (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.09)where (A+ B++) (XO4) Zq�x(H2O)
  (31.09.15)Dana Group Riomarinaite! Bi(OH)SO4•H2O P 21/n 2/m
Help on  Strunz Class: Strunz Class: 07.DF.75 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DF -With large and medium-sized cations
07.DF.75 Riomarinaite! Bi(OH)SO4•H2O P 21/n 2/m

Other Riomarinaite Information

Help on References: References: NAME( AmMin, v90, p1948) PHYS. PROP.(AmMin, v90, p1948) OPTIC PROP.(AmMin, v90, p1948)
Help on See Also: 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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Dana No: Strunz No: 07.DF.75





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