mineral – Emily Zawacki, Ph.D.

mineralogy

Tourmaline on lepidolite

May 21, 2015August 15, 2018 itssedimentary

Tourmaline on Lepidolite Cruzeiro Mine; Mina’s Gerais, Brazil Image by author

mineralogy

Bornite<

January 29, 2015August 15, 2018 itssedimentary

Also known as “peacock ore” for its vibrant rainbow hues, Bornite is a copper iron sulfide (Cu5FeS4). Specimen from Mexico Image by author

mineralogy

Apophyllite

July 30, 2014August 15, 2018 itssedimentary

Specimen from American Museum of Natural History - NYC Image by author

mineralogy

Tourmaline

July 26, 2014August 15, 2018 itssedimentary

Specimens from American Museum of Natural History - NYC Images by author

mineralogy

Malachite and azurite

July 23, 2014August 15, 2018 itssedimentary

All specimens from the American Museum of Natural History - NYC All images by author

mineralogy

Beryl crystals in pegmatite

July 20, 2014August 15, 2018 itssedimentary

Image by author

mineralogy

Tourmaline

July 17, 2014August 15, 2018 itssedimentary

Tourmaline (Elbaite) - Newry, Maine American Museum of Natural History Image by author

mineralogy

Microcline

July 15, 2014August 15, 2018 itssedimentary

Image by author

mineralogy

Vein quartz

July 14, 2014August 15, 2018 itssedimentary

If a channelway for hydrothermal solutions is left incompletely filled with mineral matter, there may be cavities, or “vugs” in the deposit which will be lined with inward pointing crystals. These are quartz crystals, showing mainly the pyramid (or, more exactly, rhombehedron) faces. The quartz was deposited on a rounded surface of hydrothermal hematite (Fe2O3)… Continue reading Vein quartz