Mercallite (original) (raw)

A valid IMA mineral species - grandfathered

About MercalliteHide

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Colour:

Colourless, sky-blue; colourless in transmitted light

Crystal System:

Orthorhombic

Name:

Named in 1935 by Guido Carobbi in honor of Giuseppe Mercalli (21 May 1850, Milan, Italy – 19 March 1914, Naples, Italy), volcanologist. At different times he was professor of geology at the University of Catania, professor at Naples University, and Director of the Vesuvius Observatory.

This page provides mineralogical data about Mercallite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2646:4

267128f4-c551-457a-a6ae-7e38b73d3e21

IMA Classification of MercalliteHide

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

Type description reference:

Classification of MercalliteHide

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7.AD.10

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
D : With only large cations

28.1.1.1

28 : ANHYDROUS ACID AND NORMAL SULFATES
1 : Anhydrous Acid Sulfates

25.1.5

25 : Sulphates
1 : Sulphates of the alkali metals and ammonium

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 MercalliteHide

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Colour:

Colourless, sky-blue; colourless in transmitted light

Density:

2.31 g/cm3 (Measured) 2.32 g/cm3 (Calculated)

Optical Data of MercalliteHide

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RI values:

_n_α = 1.445 _n_β = 1.460 _n_γ = 1.491

2V:

Measured: 56° , Calculated: 72°

δ = 0.046

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

Dispersion:

relatively strong

Chemistry of MercalliteHide

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Crystallography of MercalliteHide

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Crystal System:

Orthorhombic

Class (H-M):

m m m _(_2/_m_2/_m_2/m ) - Dipyramidal

Cell Parameters:

a = 8.429(3) Å, b = 18.976(3) Å, c = 9.807(3) Å

Ratio:

a:b:c = 0.444 : 1 : 0.517

Unit Cell V:

1,568.62 ų (Calculated from Unit Cell)

Morphology:

Stalactites composed of minute tabular crystals. Crystals tabular {001} and elongated [100] at times (artificial).

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 MercalliteHide

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Place of Conservation of Type Material:

University of Florence, Florence, Italy, 1976/I.

Geological Setting of Type Material:

Active volcanic fumaroles.

Associated Minerals at Type Locality:

Reference:

Carobbi G (1935) «Mercallite» nuovo minerale fra i prodotti dell'attivita fumarolica vesuviana del 1933. Rendiconti, Reale Accademia dei Lincei 21, 385-393

Other Language Names for MercalliteHide

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Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Notes:

Soluble in water, yielding an acidic solution.

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 MercalliteHide

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References for MercalliteHide

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Reference List:

Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.

Localities for MercalliteHide

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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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