Event Title

Fake Emerald: the History, Occurrence, and Uses of Olivine

Presenter Information

Takuto Sasajima, Colby CollegeFollow

Location

Parker-Reed, SSWAC

Start Date

1-5-2014 1:00 PM

End Date

1-5-2014 2:00 PM

Project Type

Poster- Restricted to Campus Access

Description

The name of olivine is derived from its green color. People have already started using olivine as a gemstone in ancient Egypt. Olivine is made of silicon tetrahedra linked by Magnesium and Iron atoms. The ratio of magnesium to iron in olivine can vary significantly. Two end members of olivine are the magnesium-rich forsterite and the iron-rich fayalite. Olivine forms in the upper mantle under high temperature and pressure; therefore, it is not stable and prone to weathering on the surface of Earth. It can be altered to limonite and serpentine. Olivine is usually found in mafic igneous rocks such as basalts. Dunite is a type of ultramafic plutonic rock that is almost purely olivine. It is also present in meteorites. Because of its beautiful green color, olivine is mostly used as gemstone. It is also used to purify metals.

Faculty Sponsor

Tasha Dunn

Sponsoring Department

Colby College. Geology Dept.

CLAS Field of Study

Natural Sciences

Event Website

http://www.colby.edu/clas

ID

151

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May 1st, 1:00 PM May 1st, 2:00 PM

Fake Emerald: the History, Occurrence, and Uses of Olivine

Parker-Reed, SSWAC

The name of olivine is derived from its green color. People have already started using olivine as a gemstone in ancient Egypt. Olivine is made of silicon tetrahedra linked by Magnesium and Iron atoms. The ratio of magnesium to iron in olivine can vary significantly. Two end members of olivine are the magnesium-rich forsterite and the iron-rich fayalite. Olivine forms in the upper mantle under high temperature and pressure; therefore, it is not stable and prone to weathering on the surface of Earth. It can be altered to limonite and serpentine. Olivine is usually found in mafic igneous rocks such as basalts. Dunite is a type of ultramafic plutonic rock that is almost purely olivine. It is also present in meteorites. Because of its beautiful green color, olivine is mostly used as gemstone. It is also used to purify metals.

http://digitalcommons.colby.edu/clas/2014/program/402