Tanzanite - Specimen ilvite gemstone rough FeO/Fe2_22O3_33

FeO/Fe2_22O3_33

and the way the crystal surfaces preserve both striations and contact textures

Era: Eocene Epoch

Danburite is a calcium borosilicate that commonly forms in hydrothermal and skarn-related environments

Tanzanite - Specimen ilvite gemstone rough FeO/Fe2_22O3_33Mined from: Merelani Hills, Simanjiro District, Manyara Region, Tanzania Description: This one of a kind tanzanite specimen is a natural crystal with a compact, stout form and a strong violet blue body color. It shows the straight sides, flat faces, and lengthwise growth lines typical of tanzanite, along with natural internal fractures, color zoning, and a slightly uneven termination that make it clear this is a true mineral specimen rather than a cut