Petrified wood is agatized replacement of fossil wood. It cuts and polishes like agate. So, it takes a fine polish with cerium or tin oxide, but will also polish well with diamond. It is common for this material to have fractures. Mohs hardness 7.
Measures approximately 5-1/2" x 4-1/2" x 3" thick. Weight: 4.55 lbs
Measures approximately 6-1/2" x 4-1/2" x 3-1/2" to 2" thick. Weight: 5.05 lbs
Measures approximately 5-1/2" x 4-1/4" x 3" thick. Weight: 7.70 lbs