Jarosit

Jarosit
Jarosit dari Distrik Arabia, County Pershing, Nevada
Umum
KategoriMineral sulfat
Rumus
(unit berulang)		KFe3+3(OH)6(SO4)2
Klasifikasi Strunz07.BC.10
Klasifikasi Dana30.2.5.1
Sistem kristalTrigonal
Grup ruangTrigonal 3 2/m heksagonal skalenohedral
Sel unita = 7.304 Å, c = 17.268 Å; Z=3
Identifikasi
Massa molekul500.8 g
WarnaKuning sawo atau coklat gelap
PerawakanKristal biasanya pseudokubik atau tabular
BelahanBeda di {0001}
FrakturTidak rata hingga konkoidal
Sifat dalamRapuh
Kekerasan dalam skala Mohs2.5 - 3.5
GoresKuning muda
DiafaneitasTransparan hingga tembus cahaya
Berat jenis2.9 hingga 3.3
Sifat optikUniaksial (-), biasanya biaksial dengan 2V yang sangat kecil
Indeks biasnω = 1.815 hingga 1.820; nε = 1.713 hingga 1.715
Bias ganda0.102 hingga 0.105
PleokroismeE tak berwarna, kuning yang sangat pucat, atau kuning kehijauan pucat, O kuning emas gelap atau coklat kemerahan
KelarutanTidak dapat larut di air. Larut di HCl.
Sifat lainSangat piroelektrik, tidak berpendar, radioaktivitas hampir tak dapat dilacak
Referensi[1][2][3]

Jarosit adalah sulfat hidrat potasium dan besi dengan rumus kimia KFe3+3(OH)6(SO4)2. Mineral sulfat ini terbentuk di endapan bijih melalui proses oksidasi sulfida besi. Jarosit sering kali merupakan efek samping pemurnian seng dan sering kali dikaitkan dengan pengeringan asam tambang dan lingkungan tanah asam sulfat.

Jarosit memiliki struktur kristal trigonal dan tingkat kekerasannya berdasarkan skala Mohs adalah 2,5-3,5.

Catatan kaki

  1. ^ Gaines et al (1997) Dana's New Mineralogy Eighth Edition, Wiley
  2. ^ http://www.mindat.org/min-2078.html
  3. ^ http://rruff.geo.arizona.edu/doclib/hom/jarosite.pdf

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