Mineralogy Database

Tsugaruite Mineral Data

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General Tsugaruite Information

Help on Chemical  Formula: Chemical Formula: Pb4As2S7
Help on Composition: Composition: Molecular Weight = 1,203.11 gm
   Arsenic  12.45 %  As
   Lead     68.89 %  Pb
   Sulfur   18.66 %  S
           100.00 % 
Help on Empirical Formula: Empirical Formula: Pb4As2S7
Help on Environment: Environment: Found in a veinlet of barite at the Yunosawa mine.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Minami-Tsugara-gun provincial unit of the Aomori Prefecture in northern Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the discovery locality.
Help on Name Pronunciation: Name Pronunciation: Tsugaruite + Pronunciation Say TSUGARUITE
Help on Synonym: Synonym: IMA1997-010

Tsugaruite Image

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Comments: Brown-gray fibrous spherical tsugaruite on matrix.
Location: Yunosawa Mine, Aomori, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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Comments: Dark gray veinlet of tsuraruite in matrix.
Location: Yunosawa mine, Tsugaru District, Aomori Prefecture, Japan. Scale: Picure size 3x2 cm.
© Dave Barthelmy

Tsugaruite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3982:1:0.2118
Help on Cell Dimensions: Cell Dimensions: a = 15.179, b = 38.117, c = 8.0745, Z = 16; V = 4,671.73 Den(Calc)= 6.84
Help on Crystal System: Crystal System: Orthorhombic Space Group: Pba2 or Pbam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.395(1)(450), 2.819(0.53)(550), 2.739(0.48)(560,2.13.0),2.87(0.34)(192), 3.705(0.34)(1.10.0), 4.47(0.3)(340),

Physical Properties of Tsugaruite

Help on Cleavage: Cleavage: None
Help on Color: Color: Silvery lead gray.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luster: Luster: Metallic
Help on Streak: Streak: lead gray

Calculated Properties of Tsugaruite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.75 gm/cc
note: Specific Gravity of Tsugaruite =6.84 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.15
Boson Index = 0.85
Help on Photoelectric: Photoelectric: PETsugaruite =1,267.91 barns/electron
U=PETsugaruite x rElectron Density=7,294.96 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tsugaruite is Not Radioactive

Tsugaruite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.03)where 3 < z/y < 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.03.04)Dana Group Nuffieldite Pb2Cu(Pb,Bi)Bi2S7 Pbnm 2/m 2/m 2/m Tsugaruite! Pb4As2S7 Pba2 or Pbam Ortho
Help on  Strunz Class: Strunz Class: 02.JB.30c 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.J - Sulfosalts of PbS Archetype
  02.JB -Galena derivatives, with Pb
02.JB.30c Tsugaruite! Pb4As2S7 Pba2 or Pbam Ortho

Other Tsugaruite Information

Help on References: References: NAME( CanMin, 8/99) PHYS. PROP.(Eur. J. Min.,Vol.10,p793-799,1998)
Help on See Also: See Also: Links to other databases for Tsugaruite :
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: 02.JB.30c





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