Trent Agate Slab DS1093 malachite slab The gemstone's purple color is

The gemstone's purple color is attributed to the presence of iron and aluminum impurities

It forms in concretions

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Faceted amethyst ring set in sterling silver

usually fracturing into rhombohedral shapes

Trent Agate Slab DS1093 malachite slab The gemstone's purple color isTrent Agate Slab Approx. Dimensions: 5. 5 x 3 x 0. 25 inches Approx. Weight: 145 grams Locality: Trent, Oregon Acrylic slab stand is included. This slab has a high polish on the front and is unpolished on the reverse. Trent agate, also called Trent stibnite agate is a very unique and hard to find agate. It was discovered in the 1960's in a railroad cut in Trent, Oregon and was collected for a short period before the area was closed after an accident.