Niggliite Mineral Data

Niggliite Mineral Data +

General Niggliite Information

Chemical Formula:

PtSn

Composition:

Molecular Weight = 313.79 gm

Tin 37.83 % Sn

Platinum 62.17 % Pt

______

100.00 %

Empirical Formula:

PtSn

Environment:

In late-forming hydrothermal veins.

IMA Status:

Valid Species (Pre-IMA) 1937

Locality:

Waterfall Gorge, Insizwa, Griqualand, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named for Paul Niggli (1888-1953), Professor at Zurich, Switzerland.

Synonym:

ICSD 42593

PDF 25-614

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Niggliite Crystallography

Axial Ratios:

a:c = 1:1.32473

Cell Dimensions:

a = 4.111, c = 5.446, Z = 2; V = 79.71 Den(Calc)= 13.07

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

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

By Intensity(I/I_o): 1.486(1), 2.05(1), 2.15(1),

Crystal Structure:

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Wyckoff R W G , Crystal Structures , 1 (1963) p.85-237, Second edition. Interscience Publishers, New York, New York, Note: ideal nickel arsenide structure

Physical Properties of Niggliite

Cleavage:

None

Color:

Silver white.

Density:

13.44

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

3 - Calcite

Luster:

Metallic

Optical Properties of Niggliite

RL Anisotrophism:

Very high, bright pinkish cream to very dark blue or black.

RL Color:

Silver white with a pinkish to bluish tint.

RL Pleochroism:

Strong, from pinkish cream to pale cobalt blue.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Niggliite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	52.40	55.00
420 nm	51.10	54.90
440 nm	49.80	54.80
460 nm	47.40	54.40
480 nm	46.60	55.00
500 nm	46.40	55.40
520 nm	45.80	55.90
540 nm	45.50	57.30
560 nm	45.40	58.90
580 nm	45.00	60.00
600 nm	44.30	62.00
620 nm	42.80	62.90
640 nm	41.10	64.40
660 nm	39.50	66.20
680 nm	37.70	67.20
700 nm	36.30	66.70

**Calculated Relative Intensity Colors of Niggliite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%
R₁
R₂

Calculated Properties of Niggliite

Electron Density:

r_electron=10.7 gm/cc
note: r_Niggliite=13.1 gm/cc.

Fermion Index

Fermion Index = 0.273
Boson Index = 0.727

Photoelectric:

PE_Niggliite=1,114.75 barns/electron
U=PE_Niggliite x r_electron=11886.51 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Niggliite is Not Radioactive

Niggliite Classification

Dana Class:

1.2.10.1 (1)Native Elements

(1.2)with platinum group metals and alloys

(1.2.10)Dana Group

1.2.10.1 Niggliite PtSn P 6₃/mmc 6/m 2/m 2/m

Strunz Class:

I/A.16-40 I - Elements

I/A - Metallic and intermetallic compounds, Platinum-Iron-compounds with Tin/Lead and related compunds

I/A.16 - Zvyagintsevite - Plumbopalladinite series

I/A.16-10 Zvyagintsevite (Pd,Pt,Au)3(Pb,Sn) P m3m 4/m 3 2/m

I/A.16-20 Atokite (Pd,Pt)3Sn F m3m 4/m 3 2/m

I/A.16-30 Rustenburgite (Pt,Pd)3Sn F m3m 4/m 3 2/m

I/A.16-40 Niggliite PtSn P 6₃/mmc 6/m 2/m 2/m

I/A.16-50 Stannopalladinite (Pd,Cu)3Sn2(?) P 6₃/mmc 6/m 2/m 2/m

I/A.16-60 Palarstanide Pd8(Sn,As)3 P 6₃22 6 2 2

I/A.16-70 Plumbopalladinite Pd3Pb2 P 6₃/mmc 6/m 2/m 2/m

Other Niggliite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Niggliite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Niggliite

PtSn
Dana No: 1.2.10.1 Strunz No: I/A.16-40
Locality:

Notes: