Botryoidal Turkish Crater Agate with Hematite & Goethite spodumene Tenebrescence is the ability of

Tenebrescence is the ability of some materials to change their color when exposed to sunlight

I included an out-of-focus pic or two because those give at least some sense of the brilliance of this piece

Each piece will be unique and vary slightly in size and weight

Pyrite after pyrrhotite pseudomorph is a mineral specimen that shows the replacement of pyrrhotite by pyrite

Size: 54 x 17 x 8 mm

Botryoidal Turkish Crater Agate with Hematite & Goethite spodumene Tenebrescence is the ability ofLustrous botryoidal crater agate cluster with hematite & goethite. Size: 95 x 55 x 45 mm. 352 grams From Cubuk, Ankara Province, Turkey Botryoidal agate is a type of agate that has a rounded, grape like appearance. It is formed when silica rich water fills cavities in rocks and deposits layers of chalcedony, a microcrystalline variety of quartz. The botryoidal shape is created by the growth of tiny spherical crystals on the surface of the chalcedony.