Mineral crystals grow under a variety of conditions. Slow cooling of magma (melted rock) deep within the Earth generally leads to a rock such as granite with visible crystals of feldspar, quartz, mica, amphibole and other minerals.
The Crystal Cave of Giants located inside the Naica Mine in Chihuahua Mexico was accidentally discovered in 2001 by two working miners. The vibrations are so immense heat prevents them from studying this site further. by Kelsey Leigh
Quartz crystals with blue needles of Dumortierite inside. The locality, is western Bahia, near Vaca Morta Quarry, a remote and hard to reach area near the border with Tocantins state. - Photo: Jeff ScovilQuartz with Dumortierite inclusions