කණක
| කණක | |
|---|---|
 | |
| General | |
| Category | Oxide minerals |
| රසායනික සූත්රය | BeAl2O4 |
| Strunz classification | 04.BA.05 |
| Crystal symmetry | Orthorhombic 2/m2/m2/m dipyramidal |
| Unit cell | a = 5.481 Å, b = 9.415 Å, c = 4.428 Å; Z = 8 |
| Identification | |
| පාට / පැහැය | Various shades of green, yellow, brownish to greenish black, may be raspberry-red under incandescent light when chromian; colorless, pale shades of yellow, green, or red in transmitted light |
| Crystal habit | Crystals tabular or short prismatic, prominently striated |
| Crystal system | Orthorhombic |
| Twinning | Contact and penetration twins common, often repeated forming rosette structures |
| Cleavage | Distinct on (110), imperfect on (010), poor on {001} |
| Fracture | Conchoidal to uneven |
| Tenacity | Brittle |
| Mohs scale hardness | 8.5 |
| Luster | Vitreous |
| Streak | සුදු |
| Specific gravity | 3.5 - 3.84 |
| Optical properties | Biaxial (+) |
| Refractive index | nα=1.745 nβ=1.748 nγ=1.754 |
| Pleochroism | X = red; Y = yellow-orange; Z = emerald-green |
| 2V angle | Measured: 70° |
| References | [1][2][3] |
| Major varieties | |
| Alexandrite | Color change; green to red |
| Cymophane | Chatoyant |
බෙරිලියම් මූලද්රව්ය පාදක මැණික් වර්ගයකි.
වෛරෝඩි
[සංස්කරණය]විනිවිද පෙනෙන කහ පාට කණක වෛරෝඩි නම්වේ. කපා ඹප දැමූ පසු මෙවායේ මැද අලංකාර රේඛාවක් දර්ශණය වේ.
