monticellite
grayish silicate mineral in the olivine family, calcium and magnesium silicate (CaMgSiO4), that occurs as small crystals or grains in metamorphosed siliceous dolomites, in contact skarn zones (of contact-metamorphic rock rich in iron), and, more rarely, in igneous rocks such as periodotite or nephelinite. For detailed physical properties, see olivine (table)
Learn more about monticellite with a free trial on Britannica.com.
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |