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Mineralogical ClassificationSivestrite

20th Jun 2003 07:23 UTCMarco

Hi all,

I have these notes about Siderazot - Silvestrite where Silvestrite is an old term (synonim) of Siderazot which takes its origin from Orazio Silvestri a scientist and naturalist who started studiyng this mineral, even if it was described by another mineralogist Arcangelo Scacchi - I think in Mt. Etna Sicily - and (1887) it was found also by Scacchi at Vesuvius Volcano, on the lavas of 1884-85 eruption.

Is anybody there who has more news about this mineral?

Is it possible to add the synonim Silvestrite to the Siderazot page?

Thanks

Marco

20th Jun 2003 12:27 UTCJim Ferraiolo

Marco,

The latest reference I have at hand is in Dana7/Dana8. Strunz 9 is home and I will check for anything current there, but I very much doubt it.

Jim

20th Jun 2003 14:02 UTCMarco

Thanks anyway, Jim

Marco

20th Jun 2003 20:04 UTCRob Woodside

Some years ago some lava or a furnace product with a metallic coating was marketed as Siderazot, purportedly from the 1884-5 Vesuvius eruption. The coating was too thin to x-ray or probe. Is there a simple qualitative test for a nitride, that could verify such a specimen?

20th Jun 2003 20:15 UTCmarco

I don't kow this but maybe at SEM you can have a qualitative response.. Luckily I'm sure of my two specimens, because self-collected (in 1944 eruption lavas).

I can turn your question to some friend at Pisa University...

Ciao

Marco

21st Jun 2003 01:46 UTCRob Woodside

Thanks Marco. I've forgotten if nitrogen is too light to show up in an SEM.

31st Aug 2003 10:58 UTCMarco Ciriotti

I am working on Italian type minerals.

Here my page about Siderazot (silvestrite is an obsolete name):

Name Siderazot

IMA reference Grandfathered

Chemical formula Fe5N2

Appearance Tin-white, withish, iridescent bluish; metallic; opaque thin flat dimensioned crystals, encrustations, crust-like aggregates, coatings

Crystal system Hexagonal

Space group P6322

Unit cell parameters a 4.678, c 4.369, V 82.8 Å3, Z 1

Type locality Mt. Etna, Biancavilla (CT), Sicilia

Original occurrence On lava

Other locatities - Vesuvio volcanic complex, Napoli, Campania, Italy

Origin of the name After the chemical composition

References

• Silvestri, O. (1876): La scombinazione chimica (dissociazione) applicata alla interpretazione di alcuni fenomeni vulcanici, sintesi ed analisi di un nuovo minerale dell'Etna e di origine comune nei vulcani. Atti dell'Accademia Gioenia di Scienze Naturali in Catania, Serie 3,.10

• Hendricks, S.B. & Kosting, P.B. (1930): The crystal structure of Fe2P, Fe2N, Fe3N and FeB. Zeitschrift für Kristallographie, 74, 511-533

Strunz-Nickel classification 1.BC.05

Curiosities and notes The epsilon-Fe phase of the roaldite-siderazot group; related to the gamma-Fe phase roaldite (Fe4N).

Besides the original Etnean occurrence, it was found at Vesuvius by Arcangelo Scacchi (1887), on 1884-85 lavas.

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