|Derivation:||From Labrador in Canada, where it was first found|
|Formula:||NaAlSi3O8 - CaAli2Si2O8|
|Description:||Dull dark grey rock, which flashes peacock blue or green when turned at the right angle to the light.|
|These two photographs show the same specimen at different angles, showing a glint of green, above, and blue, on the right. Feldspars can show interesting optical effects, but Labradorite is the most splendid. The colours are a reflection of the light, broken up to cause the colour. The most dramatic colours come from the polished specimens (which this is). However, a rough piece of labradorite can show small glints of colour as you turn it, as small pieces of the stone reflect light at the right angle.|
This specimen is not polished. It is far harder to get the flashes, but you can just see a few dots of blue at the bottom.