Fletcherite (original) (raw)

A valid IMA mineral species

About FletcheriteHide

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Often contains Co substituting for Ni.

Specific Gravity:

4.76 (Calculated)

Name:

Named for the type locality, the Fletcher Mine, Reynolds Co., Missouri, USA.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:1557:4

9841b17a-415a-4ab3-a43b-59f705a89a7f

IMA Classification of FletcheriteHide

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Type description reference:

Classification of FletcheriteHide

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2.DA.05

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
D : Metal Sulfides, M: S = 3 :4 and 2:3
A : M:S = 3:4

2.10.1.3

2 : SULFIDES
10 : AmBnXp, with (m+n):p = 3:4

3.11.12

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
11 : Sulphides etc. of Ni

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 FletcheriteHide

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Hardness:

VHN25=446 - 464 kg/mm2 - Vickers

Density:

4.76 g/cm3 (Calculated)

Optical Data of FletcheriteHide

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Reflectivity:

Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 45.3%.

Colour in reflected light:

Creamy white

Chemistry of FletcheriteHide

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Mindat Formula:

CuNi2S4

Often contains Co substituting for Ni.

Crystallography of FletcheriteHide

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Class (H-M):

m_3_m _(_4/_m_32/m ) - Hexoctahedral

Cell Parameters:

a = 9.520 Å

Unit Cell V:

862.80 ų (Calculated from Unit Cell)

Morphology:

Minute crystals to 200 microns.

Comment:

Space group assumed by comparison to related thiospinels.

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of FletcheriteHide

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General Appearance of Type Material:

Anhedral crystals, up to 200 µm, disseminated in copper sulfides.

Place of Conservation of Type Material:

1. The Natural History Museum, London, England.
2. Royal Ontario Museum, Toronto, Canada, M35070.
3. National Museum of Natural History (Smithsonian), Washington, D.C., USA, 137072.

Geological Setting of Type Material:

Disseminated in copper minerals

Associated Minerals at Type Locality:

Reference:

Craig, J.R, Carpenter, A.B. (1977) Fletcherite,Cu(Ni,Co)2S4, a new thiospinel from the Viburnum Trend (new lead belt), Missouri. Economic Geology: 72: 480-486.

Synonyms of FletcheriteHide

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Other Language Names for FletcheriteHide

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Relationship of Fletcherite to other SpeciesHide

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Other Members of this group:

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 FletcheriteHide

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References for FletcheriteHide

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Localities for FletcheriteHide

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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.