Uranofan
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 | |
| 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] |
References
Wikimedia Commons memiliki media mengenai Uranophane.