Difference between revisions of "Labradorite"
From The Gemology Project
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{{Labradorite}} | {{Labradorite}} | ||
[[Image:Labrador.JPG|left|framed|Labradorite]]<br clear="left" /> | [[Image:Labrador.JPG|left|framed|Labradorite]]<br clear="left" /> | ||
− | Microscopic image of labradorite taken at 45x magnification: | + | Microscopic image of labradorite taken at 45x magnification (ilmenite inclusions): |
[[Image:Labradorite 45x incident.JPG|left|thumbnail|200px]] | [[Image:Labradorite 45x incident.JPG|left|thumbnail|200px]] |
Latest revision as of 08:29, 23 February 2011
Labradorite | |
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Chemical composition | Plagioclase feldspar |
Crystal system | Triclinic |
Habit | Aggregates |
Hardness | 5-5.5 |
Optic nature | Biaxial + |
Refractive index | 1.559-1.570 |
Birefringence | 0.008-0.011 |
Dispersion | Low |
Specific gravity | 2.70 |
Lustre | Vitreous |
Microscopic image of labradorite taken at 45x magnification (ilmenite inclusions):