they are referred to as olivine volcanic bombs

97 Lbs Details: Volcanic activity Mortlake

As highlighted in the photos

Amethyst can occur in different variations

Molybdenite

Skutterudite Crystal | 692 grams | Bou Azzer, Morocco Rutilite they are referred to asSharp lustrous metallic crystals makes this top specimen of Skutterudite most beautiful and unique. Some pearly white Calcite is intergrown between crystals. Although most Skutterdite are uninteresting in form, several localities have produced sharp, lustrous crystals that are striking in aesthetics like this one. The Bou Azer District, Morocco, produces the best examples of Skutterudite, in large, lustrous crystals, often in a cuboctadral shape.