Black Rutilated Quartz 6mm Star Cut Coin A Grade - 15-16 Inch featured_06042026 Turritella Agate is a variety

Turritella Agate is a variety of Chalcedony

Iron gives them blue

that is not formed in the Earth’s crust

It is an aluminum borosilicate mixed with iron

is a calcium aluminium hydroxy sorosilicate belonging to the epidote group of minerals

Black Rutilated Quartz 6mm Star Cut Coin A Grade - 15-16 Inch featured_06042026 Turritella Agate is a varietyRutilated Quartz is a silicon dioxide mineral with unique needle like inclusions of Rutile. These needles usually appear golden, but can also appear silver, red, copper, or black and can be distributed randomly or in bundles or star like formations. Rutile is the mineral name for natural crystals of titanium dioxide, which may contain iron oxide. When the level of iron oxide is high, the inclusions appear more golden or copper, when it is low, they