Polished Dumortierite Standing Display Pieces x 6 From Madagascar Metallic and highly valued material is

and highly valued material is often used to craft decorative Malachite eggs

The petrification process

These are just as nice as the other Malachite specimens from other Congo locations but are much more lightweight with the matrix and have a beautiful and thin crystal layer

Only the rim of the geode has been polished

Polished Dumortierite Standing Display Pieces x 6 From Madagascar Metallic and highly valued material isA NOTE FROM NICK A tray of 6 expertly polished highly selected rare Dumortierite standing display pieces with warm dark blue and white colour. This material is super rare I have only seen this twice in over 30 years. PRODUCT DESCRIPTION Dumortierite from Madagascar Dumortierite from Madagascar, a fibrous aluminium borosilicate mineral known for its blue hues, ranging from sky blue to deep sapphire, with occasional violet or green tinges. Sourced