Pirus
Pirus (bahasa Inggris: turquoise) merupakan mineral tidak tembus cahaya berwarna toska yang dianggap sebagai batuan berharga karena warnanya yang unik.
| Pirus | |
|---|---|
 Batu pirus berukuran 25 mm | |
| Umum | |
| Kategori | Phosphate minerals |
| Rumus (unit berulang) | CuAl6(PO4)4(OH)8·4H2O |
| Klasifikasi Strunz | 08.DD.15 |
| Sistem kristal | Triklinis |
| Identifikasi | |
| Warna | Toska |
| Perawakan | Masif, nodular |
| Belahan | Baik ke sempurna biasanya |
| Kekerasan dalam skala Mohs | 5–7 |
| Gores | Putih kebiruan |
| Berat jenis | 2.6–2.9 |
| Sifat optik | Biaxial (+) |
| Indeks bias | nα = 1.610 nβ = 1.615 nγ = 1.650 |
| Bias ganda | +0.040 |
| Pleokroisme | Lemah |
| Fusibilitas | Menyatu dalam HCl yang dipanaskan |
| Kelarutan | Larut dalam HCl |
| Referensi | [1][2][3] |
Etimologi
suntingIstilah "pirus" berasal dari kata bahasa Arab فيروز (fairuz).
Referensi
sunting- ^ Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., John Wiley and Sons, New York ISBN 0-471-80580-7
- ^ "Turquoise:turquoise mineral information and data". mindat.org. Diakses tanggal 2006-10-04.
- ^ Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W. and Nichols, Monte C., ed. (2000). "Turquoise". Handbook of Mineralogy (PDF). IV (Arsenates, Phosphates, Vanadates). Chantilly, VA, US: Mineralogical Society of America. ISBN 0962209732.
Bacaan lanjut
sunting
Wikimedia Commons memiliki media mengenai Turquoise (mineral).
- British Museum (2000). Aztec turquoise mosaics. Retrieved November 15, 2004 from www.thebritishmuseum.ac.uk
- Dietrich, R. V. (2004). Turquoise. Retrieved November 20, 2004 from www.cst.cmich.edu/users/dietr1rv/turquoise.htm
- Persian Turquoise Mine [1] Diarsipkan 2019-06-26 di Wayback Machine.
- King, R. J. (2002) Turquoise. Geology Today 18 (3), pp. 110–114. Retrieved November 24, 2004, from: http://doi.org/10.1046/j.1365-2451.2002.00345.x
- Pogue, J. E. (1915). The turquoise: a study of its history, mineralogy, geology, ethnology, archaeology, mythology, folklore, and technology. National Academy of Sciences, The Rio Grande Press, Glorieta, New Mexico. ISBN 0-87380-056-7
- Schadt, H. (1996). Goldsmith's art: 5000 years of jewelry and hollowware. Arnoldsche Art Publisher, Stuttgart, New York. ISBN 3-925369-54-6
- Schumann, W. (2000). Gemstones of the world, revised edition. Sterling Publishing. ISBN 0-8069-9461-4
- Webster, R. (2000). Gems: Their sources, descriptions and identification (5th ed.), pp. 254–263. Butterworth-Heinemann, Great Britain. ISBN 0-7506-1674-1