Prehnite 7x10mm Faceted Tube - 15-16 Inch Ancient Cellar Agate Sieber agate is not a

Sieber agate is not a true agate but rather a glassy

but it can still be damaged by abrasion or compromised by exposure to moisture and chemicals

was inspired by the stone and chose it for the interior decorations of Marlborough House in England

Shattuckite is a pseudomorph

This stone is a combination of two very similar materials: Azurite is a deep blue mineral produced by weathered copper ore deposits

Prehnite 7x10mm Faceted Tube - 15-16 Inch Ancient Cellar Agate Sieber agate is not aPrehnite was the first mineral to be named after a person: its discoverer, Dutch Colonel Hendrik Von Prehn. Von Prehn discovered the stone in South Africa in 1774. Prehnite is translucent to transparent, in colors from light green to yellow green to olive, with occasional inclusions of Black Tourmaline that crisscross the stone in fibrous patterns. It is a phyllosilicate composed of silicon, calcium and aluminum with trace amounts of iron.