This multicolored lily pad is actually a bloom of the iron-based mineral hematite in Brazilian quartz. Danny Sanchez Opal seems to create a burst of blue flame in this Mexican rhyolite. Danny ...

Microscopic iron-carbonate (white) rosette with concentric layers of quartz inclusions (grey) and a core of a single quartz crystal with tiny (nanoscopic) inclusions of red hematite from the ...

It contains concentric layers of quartz inclusions and a quartz core. It also has tiny inclusions of hematite, which could have formed when hydrothermal vent microbes oxidized iron as part of ...