Tsugaruite Mineral Data

General Tsugaruite Information

Chemical Formula:

Pb4As2S7

Composition:

Molecular Weight = 1,203.11 gm

Arsenic 12.45 % As

Lead 68.89 % Pb

Sulfur 18.66 % S

______

100.00 %

Empirical Formula:

Pb₄As₂S₇

Environment:

Found in a veinlet of barite at the Yunosawa mine.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Minami-Tsugara-gun provincial unit of the Aomori Prefecture in northern Japan. Link to MinDat.org Location Data.

Name Origin:

Named after the discovery locality.

Name Pronunciation:

Tsugaruite + Pronunciation

Synonym:

IMA1997-010

Tsugaruite Image

Images:

Tsugaruite

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

Images:

Tsugaruite

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

Axial Ratios:

a:b:c =0.3982:1:0.2118

Cell Dimensions:

a = 15.179, b = 38.117, c = 8.0745, Z = 16; V = 4,671.73 Den(Calc)= 6.84

Crystal System:

OrthorhombicSpace Group: Pba2 or Pbam

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Cleavage:

None

Color:

Silvery lead gray.

Diaphaneity:

Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Metallic

Streak:

lead gray

Calculated Properties of Tsugaruite

Electron Density:

Bulk Density (Electron Density)=5.75 gm/cc
note: Specific Gravity of Tsugaruite =6.84 gm/cc.

Fermion Index:

Fermion Index = 0.15
Boson Index = 0.85

Photoelectric:

PE_Tsugaruite=1,267.91 barns/electron
U=PE_Tsugaruite x rElectron Density=7,294.96 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tsugaruite is Not Radioactive

Tsugaruite Classification

Dana Class:

03.03.04.02 (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

03.03.04.01 Nuffieldite Pb2Cu(Pb,Bi)Bi2S7 Pbnm 2/m 2/m 2/m

03.03.04.02 Tsugaruite! Pb4As2S7 Pba2 or Pbam Ortho

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

References:

NAME( CanMin, 8/99) PHYS. PROP.(Eur. J. Min.,Vol.10,p793-799,1998)

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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Ask about Tsugaruite here :
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Print or Cut-and-Paste your Tsugaruite Specimen Label here :

Tsugaruite

Pb4As2S7
Dana No: 03.03.04.02 Strunz No: 02.JB.30c
Locality:

Notes: