Fulgurite is found: 18 foot long, 18 inch wide with 3 inch canal.

FULGURITE IS FOUND OF 18 FOOT LONG AND pipes of 18 INCH WIDE INCLUDING THE HOLLOW CANAL OF 3 INCH.

Also Fulgurite in the USA.
https://youtu.be/2_rWMWisl_U see 2.50 minutes.

It seems evidence for different decay times of ball lightning or better different STRINGY diameters knots. just as is observed in India street pole Ball Lightning.

below.

see: https://youtu.be/Y6oCTWDeL8c

Other example of a splitting micro comet/ ball lightning

https://youtu.be/puFBnUsqVIg