فیروز
وکیپیڈیا سے
| فیروز ۔ Turquoise | |
|---|---|
 Turquoise pebble, one inch (25 mm) long. This pebble is greenish and therefore low grade |
|
| General | |
| Category | Phosphate mineral |
| Chemical formula | CuAl6(PO4)4(OH)8·4H2O |
| Identification | |
| Colour | Blue, blue-green, green |
| Crystal habit | Massive, nodular |
| Crystal system | Triclinic |
| Cleavage | Good to perfect - usually N/A |
| Fracture | Conchoidal |
| Mohs scale hardness | 5-6 |
| Lustre | Waxy to subvitreous |
| Streak | Bluish white |
| Specific gravity | 2.6-2.9 |
| Optical properties | Biaxial (+) |
| Refractive index | nα = 1.610 nβ = 1.615 nγ = 1.650 |
| Birefringence | +0.040 |
| Pleochroism | Weak |
| Fusibility | Fusible in heated HCl |
| Solubility | Soluble in HCl |
| References | [1][2][3] |
- ^ 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. http://www.mindat.org/min-4060.html. Retrieved 2006-10-04.
- ^ http://rruff.geo.arizona.edu/doclib/hom/turquoise.pdf Handbook of Mineralogy
