from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A slender, usually tubular body of glassy rock produced by lightning striking and then fusing dry sandy soil.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. glass formed by a lightning strike melting sand or other material
from the GNU version of the Collaborative International Dictionary of English
- n. A vitrified sand tube produced by the striking of lightning on sand; a lightning tube; also, the portion of rock surface fused by a lightning discharge.
from The Century Dictionary and Cyclopedia
- n. A tube formed, usually in loose sand, but sometimes in the solid rock, by lightning; a lightning-tube.
- n. An explosive of the nitroglycerin class, used for blasting: similar to dynamite, but the nature of the dope has not been disclosed by the inventor.
The unheated soil associated with the fulgurite is a tan, sandy silt.
I found a fulgurite, once It was broken off near where the boiled sand first fused to glass and ended about six inches down the stem.
Is the light grey stone on the right part of the matrix surrounding the fulgurite?
The photographer says that the entire fulgurite is about 10 cm in diameter, but this photograph is only a detail.
During the lightning strike, the soil heated up to the gray color shown in this photo, forming the exterior of the fulgurite, and individual grains are cemented together with a small amount of glass.
It was a fulgurite, Laura told him, sand fused the moment it was struck by lightning.
"The lab reported the explosive had been chemical - fulgurite-B, the name is."
Also found in the altar trench was a sample of fulgurite or petrified lightning.
It is not clear if the fulgurite was formed on the mountain-top or if it was brought to the site as a dedication to Zeus.
The fulgurite was interesting–I’ve never found one although I have seen the shatter cones in the rock around Sudbury from the meteorite that planted the nickel mines 1.8 billion years ago.