Blue Calcite Towers / 2.5-4.5" AVG - 1 LB. LOT Menu Pyramids Black Tourmaline is formed through

Black Tourmaline is formed through the crystallization of boron-rich solutions in igneous rocks

While we select them at random (highest quality items chosen first)

Mix of Size 6 and 7)

The stone's main red and brown portions are sard

The listing is for the agate slice only

Blue Calcite Towers / 2.5-4.5" AVG - 1 LB. LOT Menu Pyramids Black Tourmaline is formed throughQuantity: 1 pound Average size range: 2. 5 to 4. 5 inches Calcite is a mineral that forms mostly in limestone deposits and caves, and can exhibit a wide range of colors depending on the impurities and trace elements it absorbs from the surrounding area. This variety of calcite derives its color from copper inclusions that oxidized while it formed.