F
is for
FULGURITE
I heard of fulgurite many years ago, but had only ever seen it in photographs. Then one day I was browsing through eBay when I saw these.
10 pieces of fulgurite from Algeria.
Now they have joined my collection!
Fulgurite is also known as lightning stone.
It is formed when lightning strikes sand and fuses it into glass tubes, which are smooth on the inside but rough and granular on the outside. These tubes can be forked, and some can be several meters in length. More information can be found here.
My specimens are small - the longest measures only about 4cm.
If you look closely you can see the tubes.
More F words (no, not those words!) can be found through the ABC page.
Have FUN!
