Niggliite (original) (raw)

A valid IMA mineral species - grandfathered

About NiggliiteHide

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Specific Gravity:

13.4 (Calculated)

Name:

Named by D. L. Scholtz after Professor Paul Niggli [June 26, 1888 Zofingen, Switzerland - January 13, 1953 Zurich, Switzerland]. Niggli was a brilliant crystallographer and taught at Eidgenössische Technische Hochschule and at the University of Zurich.

There was confusion in the early literature, starting with the original description suggesting the mineral was PtTe, which has similar XRD and optical properties.

NiAs-type crystal structure.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2904:5

8b7c9b04-a2b7-4362-a49c-645ff31dfa26

IMA Classification of NiggliiteHide

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Approved, 'Grandfathered' (first described prior to 1959)

Type description reference:

Classification of NiggliiteHide

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1.AG.60

1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
G : PGE-metal alloys

1.2.10.1

1 : NATIVE ELEMENTS AND ALLOYS
2 : Platinum Group Metals and Alloys

1.84

1 : Elements and Alloys (including the arsenides, antimonides and bismuthides of Cu, Ag and Au)

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of NiggliiteHide

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Hardness:

VHN25=572 - 673 kg/mm2 - Vickers

Comment:

Exhibits hardness anisotropy

Density:

13.4 g/cm3 (Calculated)

Optical Data of NiggliiteHide

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Anisotropism:

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

Bireflectance:

Strong, pinkish cream to pale cobalt-blue

Reflectivity:

Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 68.5%.
R1 shown in black, R2 shown in red

Colour in reflected light:

pinkish to blue

Chemistry of NiggliiteHide

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Common Impurities:

Pd,Sb,Bi,Te

Crystallography of NiggliiteHide

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Class (H-M):

6/m m m _(_6/_m_2/_m_2/m ) - Dihexagonal Dipyramidal

Cell Parameters:

a = 4.100(1) Å, c = 5.432(2) Å

Unit Cell V:

79.08 ų (Calculated from Unit Cell)

Morphology:

rounded to anhedral inclusions

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of NiggliiteHide

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General Appearance of Type Material:

Rounded to anhedral inclusions, to 75 µm.

Place of Conservation of Type Material:

National Museum of Natural History, Washington, D.C., USA, 162610.

Reference:

Scholtz, D.L. (1936) The magmatic nickelferous ore deposits of East Griqualand and Pondoland. Transactions of the Geological Society of South Africa: 39: 184-186.

Other Language Names for NiggliiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for NiggliiteHide

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References for NiggliiteHide

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Localities for NiggliiteHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.