Nyholmite (original) (raw)

A valid IMA mineral species

Formula:

Cd3Zn2(AsO4)2(HAsO4)2 · 4H2O

Specific Gravity:

4.23 (Calculated)

Crystal System:

Monoclinic

Name:

Named for Sir Ronald Sydney Nyholm (1917-1971), born at Broken Hill, New South Wales, and chair and professor of Chemistry at University College, London from 1955 to 1971. The name recognises his numerous contributions to inorganic chemistry, in particular the coordination chemistry of the transition metals, and also recognises his Broken Hill roots. He received numerous awards, especially from chemical societies.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:39210:1

53db31dc-f7b4-4d1f-9f50-fc2ce64a4efe

IMA Classification of NyholmiteHide

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IMA Formula:

Cd3Zn2(AsO3OH)2(AsO4)2 · 4H2O

Classification of NyholmiteHide

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8.CB.10

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1

39.2.1.6

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O

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 NyholmiteHide

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Transparency:

Transparent, Translucent

Density:

4.23 g/cm3 (Calculated)

Comment:

for empirical formula

Chemistry of NyholmiteHide

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Mindat Formula:

Cd3Zn2(AsO4)2(HAsO4)2 · 4H2O

Crystallography of NyholmiteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 18.062(4) Å, b = 9.341(19) Å, c = 9.844(2) Å
β = 96.17(3)°

Ratio:

a:b:c = 1.934 : 1 : 1.054

Unit Cell V:

1,651.23 ų (Calculated from Unit Cell)

Morphology:

White globules, tufted aggregates of fibrous crystals and radiating hemispheres of thin, colourless, bladed crystals.

Comment:

Crystal data from measurement at 123 K.

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 NyholmiteHide

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General Appearance of Type Material:

White globules, tufted aggregates of fibrous crystals and radiating hemispheres of thin, colourless, bladed crystals.

Place of Conservation of Type Material:

South Australian Museum, Adelaide, South Australia (catalog no. G32511).

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Reference:

Elliott, P., Turner, P., Jensen, P., Kolitsch, U., Pring, A. (2009) Description and crystal structure of nyholmite, a new mineral related to hureaulite, from Broken Hill, New South Wales, Australia. Mineralogical Magazine: 73: 723-735.

Synonyms of NyholmiteHide

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Relationship of Nyholmite to other SpeciesHide

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Other Members of this group:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Notes:

Slowly soluble in cold 10% HCl.

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 NyholmiteHide

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References for NyholmiteHide

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Reference List:

Elliott, P., Turner, P., Jensen, P., Kolitsch, U., Pring, A. (2009) Description and crystal structure of nyholmite, a new mineral related to hureaulite, from Broken Hill, New South Wales, Australia. Mineralogical Magazine, 73 (5) 723-735 doi:10.1180/minmag.2009.073.5.723

Caboni, F., Vinci, A., Cámara, F., Marengo, A., Bittarello, E., Brizio, P., Antonazzo, I., Ciriotti, M.E. (2018): Nyholmite dalla Sardegna - Secondo ritrovamento al mondo. Micro, 16, 157-164 (in Italian with abstracts in English, French and German).

Localities for NyholmiteHide

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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.