Definition of mosandrite in US English:

mosandrite

noun

Mineralogy
  • A monoclinic silicate and fluoride of sodium, calcium, cerium, and titanium which occurs as yellow to brown translucent crystals.

Origin

Mid 19th century; earliest use found in The Penny Cyclopaedia. From German Mosandrit from the name of K. G. Mosander, Swedish chemist + -it.