Phosphate minerals that can contain hydroxide, chloride, or fluoride ions


Lots of flat orange crystals with some small grains of yellow crystals in between.

Photo by Egen Wark

Reposted from our friend Mineralogy on Google+: Vanadinite is a lead chlorovanadate characterized by red to red-orange hexagonal crystals. It is a secondary mineral found in the oxidized zone of lead deposits resulting from the alteration of vanadiferous sulfides and silicates. A member of the apatite group, vanadinite forms a solid-solution series with its phosphate (pyromorphite) and arsenate (mimetite) analogues. It was first discovered in Mexico in the 19th century and is prized by collectors due to its distinctive color.

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Apatite is a general name for a group of very soft phosphate minerals that form big crystals that are fun to collect. This red and green double-terminated apatite crystal is 21 inches long! It was found on the Miller Property in Eganville, Ontario, Canada during a CCFMS (Central Canadian Federation of Mineralogical Societies) field trip in July 2002. For more photos and information, and a cute poem about collecting apatite, check out the website linked in the photo, http://www.rocksforkids.com/R&M/apatite.htm