Uranofan
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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.
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Uranofan | |
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Umum | |
Kategori | Uranyl neso- and polysilicates |
Rumus (unit berulang) | Ca(UO2)2[HSiO4]2·5H2O |
Klasifikasi Strunz | 9.AK.15 |
Sistem kristal | Monoclinic |
Kelas kristal | Sphenoidal (2) (same H-M symbol) |
Grup ruang | P21 |
Sel unit | a = 15.85 Å, b = 6.98 Å c = 6.64 Å; β = 97.45°; Z = 2 |
Identifikasi | |
Massa molekul | 586.36 g/mol |
Warna | Light yellow, lemon-yellow, honey-yellow, straw-yellow, green-yellow |
Perawakan | Crystals occur as stellate needle aggregates; as fibrous crusts, and massive |
Belahan | {100} Perfect |
Fraktur | Uneven |
Sifat dalam | Brittle |
Kekerasan dalam skala Mohs | 2.5 |
Kilau | Vitreous to pearly; waxy or dull when massive |
Gores | Yellowish white |
Diafaneitas | Translucent to subtranslucent |
Berat jenis | 3.81 - 3.90 |
Sifat optik | Biaxial (-) |
Indeks bias | nα = 1.643 nβ = 1.666 nγ = 1.669 |
Bias ganda | δ = 0.026 |
Pleokroisme | Weak; X = colorless; Y = pale canary-yellow; Z = canary-yellow |
Sudut 2V | 32° to 45°, measured |
Fluoresensi ultraungu | Weak yellow-green under both short and long UV |
Sifat lain | Radioaktif |
Referensi | [1][2][3] |
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