Blue Quartz: Mineral information, data and localities.

An opaque to translucent, blue variety of quartz, owing its colour to inclusions, commonly of fibrous magnesioriebeckite or crocidolite, or of tourmaline.

Quartz: The mineral Quartz information and pictures

Celestine: Mineral information, data and localities., ralf morales ojo

Rocks – News, Research and Analysis – The Conversation – page 1

Blue Quartz – Mineralogy

Evidence for the oxidation of Earth's crust from the evolution of manganese minerals

Celestine: Mineral information, data and localities., ralf morales ojo

Riebeckite Blue Quartz - Mineral

Igneous Rocks - Geology (U.S. National Park Service)