A Quartz cabochon from Diamanta, Minas Gerais, Brazil with sprays of metallic black & golden-brown Goethite needles against a background of colourless quartz.
These inclusions are sometimes referred to as "Cacoxenite" although it should be noted that this is an incorrect description.
Image 4 is a magnified view of the inclusion scene.
weight: 27.93 carats
shape: Freeform cabochon
dimensions: 30.53 x 21.99 x 5.85 mm