Saturday, 28 July 2007

Mineral Spot: Fluorescence...

Quite a few minerals 'glow' under ultraviolet light (known as 'UV'). Some of the colours can be very intense. This particular specimen is franklinite (black), zincite (orange-brown) and the pale mineral is calcite. To the right of the image, you can see how this pale-coloured mineral has reacted to short wave UV. Interestingly, this specimen does not react to long wave UV (some minerals react to one and not the other, some to both). The specimen comes from Franklin, New Jersey, a location well-known for its fluorescent minerals.

No comments: