Wilhelmramsayite Mineral Data

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General Wilhelmramsayite Information

Chemical Formula:

Cu3FeS3•2(H2O)

Composition:

Molecular Weight = 378.36 gm

Potassium 0.31 % K

Sodium 0.12 % Na

Thallium 0.54 % Tl

Iron 15.35 % Fe

Copper 48.87 % Cu

Hydrogen 1.05 % H

Sulfur 25.42 % S

Oxygen 8.33 % O

______

100.00 %

Empirical Formula:

Cu_2.91Fe²⁺_1.04S₃K_0.03Na_0.02Tl_0.01•1.97(H₂O)

Environment:

Occurs in the core zone of an ultra-agpaitic pegmatite generally of potassium feldspar–nepheline–sodalite–alkali amphibole-pyroxene composition.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Koashva Mountain, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Name for Wilhelm Ramsay, Finnish geologist who did the first detailed study of the Khibiny-Lovozero alkaline complexes.

Synonym:

IMA2004-033

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Wilhelmramsayite Crystallography

Axial Ratios:

a:b:c =0.7061:1:0.8079

Cell Dimensions:

a = 5.147, b = 7.289, c = 5.889, Z = 1; V = 220.93 Den(Calc)= 2.84

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P mmm

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

By Intensity(I/I_o): 3.104(1), 1.897(0.7), 1.828(0.5),2.292(0.5), 2.727(0.5), 4.21(0.4), 5.12(0.4), 3.69(0.3),

Physical Properties of Wilhelmramsayite

Cleavage:

{001} Perfect

Color:

Dark lead gray, Iron black.

Density:

2.75

Diaphaneity:

Opaque

Fracture:

Flexible - Flexible fragments.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5 - Finger Nail

Luster:

Metallic

Magnetism:

Weakly ferromagnetic

Optical Properties of Wilhelmramsayite

RL Anisotrophism:

Weak with no internal reflections.

RL Bireflectance:

Weakly bluish gray to gray with bluish tints.

RL Color:

Bluish gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Wilhelmramsayite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	14.95	17.45
470 nm	13.70	16.35
546 nm	11.35	14.00
589 nm	10.00	12.55
650 nm	8.65	11.00
700 nm	8.00	9.80

**Calculated Relative Intensity Colors of Wilhelmramsayite in Air**
Relative Intensity	0%	90%	100%	180%	270%	360%	450%	540%	630%	720%	810%	880%
R₁
R₂

Calculated Properties of Wilhelmramsayite

Electron Density:

Bulk Density (Electron Density)=2.71 gm/cc
note: Specific Gravity of Wilhelmramsayite =2.84 gm/cc.

Fermion Index:

Fermion Index = 0.0052030927
Boson Index = 0.9947969073

Photoelectric:

PE_{Wilhelmramsayite}= 35.94 barns/electron
U=PE_{Wilhelmramsayite} x r_electron= 97.50 barns/cc.

Radioactivity:

GRapi = 4.28 (Gamma Ray American Petroleum Institute Units)
Concentration of Wilhelmramsayite per GRapi unit = 23.39 (%)

Estimated Radioactivity from Wilhelmramsayite - barely detectable

Wilhelmramsayite Classification

Dana Class:

02.14.08.01 (02)Sulfides - Including Selenides and Tellurides

(02.14)(Hydroxyl or Hydrated)

(02.14.08)Dana Group

02.14.08.01 Wilhelmramsayite! Cu3FeS3•2(H2O) P mmm 2/m 2/m 2/m

Strunz Class:

02.FD.40 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O

02.FD -With O, OH, H2O

02.FD.40 Wilhelmramsayite! Cu3FeS3•2(H2O) P mmm 2/m 2/m 2/m

Other Wilhelmramsayite Information

References:

NAME( AmMin, v94:407) PHYS. PROP.(AmMin, v94:407) OPTIC PROP.(AmMin, v94:407)

See Also:

Links to other databases for Wilhelmramsayite :
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 Wilhelmramsayite Specimen Label here :

Wilhelmramsayite

Cu3FeS3•2(H2O)
Dana No: 02.14.08.01 Strunz No: 02.FD.40
Locality:

Notes: