Isselite (original) (raw)

A valid IMA mineral species

About IsseliteHide

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Formula:

Cu6(SO4)(OH)10 · 5H2O

Contains probably essential minor Ni, Co and Zn.

Crystal System:

Orthorhombic

Name:

Dedicated to Arturo Issel (11 April 1842, Genoa, Italy – 27 November 1922, Genoa, Italy) for his pioneering work on the geology, palaeontology and mineralogy of Italy, with a special reference to Liguria (Issel, 1892). He was professor of Geology and Mineralogy at the University of Genoa beginning in 1866 and Director of the Institute of Geology and the Geological Museum until 1917.

The Cu analogue of guarinoite in terms of chemistry and chemically related to montetrisaite and redgillite.

"The actual role of Ni in stabilising this phase deserves further study" (Biagioni et al., 2020).

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:53412:3

2df734e5-2623-40b1-8a54-6347d659cbd2

IMA Classification of IsseliteHide

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IMA Formula:

Cu6(SO4)(OH)10(H2O)4 · H2O

Type description reference:

Biagioni, Cristian, Belmonte, Donato, Carbone, Cristina, Cabella, Roberto, Demitri, Nicola, Perchiazzi, Natale, Kampf, Anthony R., Bosi, Ferdinando (2020) Isselite, Cu6(SO4)(OH)10(H2O)4⋅H2O, a new mineral species from Eastern Liguria, Italy. Mineralogical Magazine, 84 (5) 653-661 doi:10.1180/mgm.2020.50

Classification of IsseliteHide

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7.DD.40

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
D : With only medium-sized cations; sheets of edge-sharing octahedra

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 IsseliteHide

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Hardness Data:

Could not be measured

Cleavage:

Distinct/Good
Good cleavage on {001} and {100}.

Fracture:

Irregular/Uneven

Density:

3.00(2) g/cm3 (Measured) 2.946 g/cm3 (Calculated)

Comment:

Calculated value based on empirical formula.

Optical Data of IsseliteHide

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RI values:

_n_α = 1.599(2) _n_β = 1.633(2) _n_γ = 1.647(2)

δ = 0.048

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Dispersion:

moderate, with r > v.

Comments:

X = light blue, Y = blue, Z = blue

Comments:

Optical orientation: X = b, Y = c and Z = a.
Absorption: X << Z < Y.

Chemistry of IsseliteHide

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Mindat Formula:

Cu6(SO4)(OH)10 · 5H2O

Contains probably essential minor Ni, Co and Zn.

Crystallography of IsseliteHide

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Crystal System:

Orthorhombic

Class (H-M):

m _m_2 - Pyramidal

Cell Parameters:

a = 6.807(1) Å, b = 5.897(1) Å, c = 20.654(4) Å

Ratio:

a:b:c = 1.154 : 1 : 3.502

Unit Cell V:

829.07 ų (Calculated from Unit Cell)

Morphology:

Acicular crystals, striated parallel to [100] and tabular on {001}. Observed forms are {001}, {010}, {103} and {103}.

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of IsseliteHide

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General Appearance of Type Material:

Sprays of blue acicular crystals, up to 0.1 mm long.

Place of Conservation of Type Material:

Mineralogical collections of the Museo di Storia Naturale, Università di Pisa, Via Roma 79, Calci (Pisa, Italy), catalogue number 19904 (holotype), the Dipartimento di Scienze della Terra, dell’Ambiente e della Vita (DISTAV), Università di Genova, Corso Europa 26, Genova, Italy, catalogue number MO484 (holotype); the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number 67195 (cotype).

Associated Minerals at Type Locality:

Reference:

Biagioni, C., Belmonte, D., Carbone, C., Cabella, R., Demitri, N., Perchiazzi, N., ... & Bosi, F. (2020). Isselite, Cu6 (SO4)(OH) 10 (H2O) 4⋅ H2O, a new mineral species from Eastern Liguria, Italy. Mineralogical Magazine, 84(5), 653-661.

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 IsseliteHide

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References for IsseliteHide

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Reference List:

Biagioni, Cristian, Belmonte, Donato, Carbone, Cristina, Cabella, Roberto, Demitri, Nicola, Perchiazzi, Natale, Kampf, Anthony R., Bosi, Ferdinando (2020) Isselite, Cu6(SO4)(OH)10(H2O)4⋅H2O, a new mineral species from Eastern Liguria, Italy. Mineralogical Magazine, 84 (5) 653-661 doi:10.1180/mgm.2020.50

Localities for IsseliteHide

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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.