White and blue opal made of large black petrified wood from Nakakawabe, Gifu Prefecture. Although the area is small, it is famous for being able to mine ash zeolite and elion zeolite. Another type of wood is silicified wood, which is wood that has been incorporated into tuff and has become silicified. The petrified wood here is structurally worthy of being called a nodule. Silicic acid accumulates around the petrified wood and also incorporates surrounding gravel. This black petrified wood is beautiful and has blue opal on its tips. This opal is a woody opal made from petrified wood. Petrified wood itself is also not completely petrified. The person who got it from said that when he cracked the black petrified wood at the production site and saw a beautiful blue opal with blue and white colors, he was very impressed. This is a first-class specimen of blue and white woody opal with black diatomaceous host rock. 79.2×22.0×14.0mm 30.34g. Item Condition RANK : b. A: Excellent condition, preserved well. B: Good, There is no problem in use. International Buyers – Please Note. Thank you for your understanding.