Mini

Per a altres significats, vegeu «Mini (desambiguació)».
Infotaula de mineralMini

Cristalls de mini de la mina Yuma (Arizona, Estats Units) Modifica el valor a Wikidata
Fórmula químicaPb₃O₄
Epònimcinabri Modifica el valor a Wikidata
Classificació
Categoriaòxids
Nickel-Strunz 10a ed.4.BD.05 Modifica el valor a Wikidata
Nickel-Strunz 9a ed.4.BD.05 Modifica el valor a Wikidata
Nickel-Strunz 8a ed.IV/B.03 Modifica el valor a Wikidata
Dana7.2.8.1
Heys7.11.22
Propietats
Sistema cristal·lítetragonal
Estructura cristal·linaa = 8,811(5) Å; c = 6,563(3) Å
Grup puntual4/mmm (4/m 2/m 2/m) - ditetragonal dipiramidal
Grup espacialp4₂/mbc
Colorvermell, vermell marronós, to groguenc de vegades; vermell en llum transmesa
Duresa (Mohs)2,5
Lluïssorgrassa, mat
Color de la ratllataronja-groc
Densitat8,9 a 9,2 g/cm³⁺ (mesurada); 8,92 g/cm³⁺ (calculada)
Propietats òptiquesuniaxial
Índex de refracciónω = 2,420 nε = 2,410
Birefringènciaδ = 0,010
Pleocroismefort
Més informació
Estatus IMAmineral heretat (G) Modifica el valor a Wikidata
SímbolMnm Modifica el valor a Wikidata
Referències[1]

El mini (del llatí minium, vermelló), també anomenat plom vermell, és un mineral de la classe dels òxids que pertany i dona nom al grup del mini.[2]

Característiques

El mini és un tetraòxid de plom de fórmula química Pb₃O₄. Cristal·litza en el sistema tetragonal. La seva duresa a l'escala de Mohs és 2,5. S'utilitzava com a pigment per a pintures des de la prehistòria i fins fa uns anys per a pintures antioxidants, per sota de la pintura exterior del color desitjat. En estar fet a base d'un metall pesant, és tòxic.

Formació i jaciments

Tot i tractar-se d'una espècie no gaire habitual ha estat descrita en tots els continents del planeta a excepció de l'Antàrtida. Als territoris de parla catalana ha estat descrita a la pedrera de Can Rovira, a Sant Fost de Campsentelles (Vallès Oriental, Barcelona) i a la mina La Cresta, a Bellmunt del Priorat (Priorat, Tarragona).

Referències

  1. «Minium» (en anglès). Mindat. [Consulta: 14 febrer 2023].
  2. Bosi, Ferdinando; Hatert, Frédéric; Pasero, Marco; Mills, Stuart J. «IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 73». European Journal of Mineralogy, 35, 3, 19-06-2023, pàg. 397–402. DOI: https://doi.org/10.5194/ejm-35-397-2023 [Consulta: 4 juliol 2023].

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