Uranofan (uranophane, Ca(UO2)2(SiO3OH)2·5H2O), atau uranotil adalah mineral langka yang mengandung unsur kalsium, uranium, dan silikon. Senyawa ini berwarna kuning dan bersifat radioaktif.

Uranofan
Umum
KategoriUranyl neso- and polysilicates
Rumus
(unit berulang)
Ca(UO2)2[HSiO4]2·5H2O
Klasifikasi Strunz9.AK.15
Sistem kristalMonoclinic
Kelas kristalSphenoidal (2)
(same H-M symbol)
Grup ruangP21
Sel unita = 15.85 Å, b = 6.98 Å
c = 6.64 Å; β = 97.45°; Z = 2
Identifikasi
Massa molekul586.36 g/mol
WarnaLight yellow, lemon-yellow, honey-yellow, straw-yellow, green-yellow
PerawakanCrystals occur as stellate needle aggregates; as fibrous crusts, and massive
Belahan{100} Perfect
FrakturUneven
Sifat dalamBrittle
Kekerasan dalam skala Mohs2.5
KilauVitreous to pearly; waxy or dull when massive
GoresYellowish white
DiafaneitasTranslucent to subtranslucent
Berat jenis3.81 - 3.90
Sifat optikBiaxial (-)
Indeks biasnα = 1.643 nβ = 1.666 nγ = 1.669
Bias gandaδ = 0.026
PleokroismeWeak; X = colorless; Y = pale canary-yellow; Z = canary-yellow
Sudut 2V32° to 45°, measured
Fluoresensi ultraunguWeak yellow-green under both short and long UV
Sifat lainRadioaktif
Referensi[1][2][3]

Referensi

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