A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Olivine in basalt, Arizona |
|---|---|
| Description | Many basalts contain olivine, and sometimes the crystals are large and in clumps as shown here. Olivine is not a recognized mineral name; it is instead a general term given to a series of compositions between two end members, fayalite (Fe2SiO4) and forsterite (Mg2SiO4). Fayalite-rich olivines have a higher index of refraction, are denser, and have a darker color than forsterite-rich olivines. Virtually all specimens contain iron and magnesium. Telling compositon from appearance is inexact, so the general name olivine is used. This specimen is 13 cm across. |
| Location | USA ▹ Arizona ▹ Gila. San Carlos Indian Reservation. |
| Photographer | Nessa Eull. 2001-05-22. |
| Collection | Dexter Perkins Mineral Collection. |
| Key words | Olivine, Arizona |
| Tech details | 561 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60 mm AF Nikon micro lens. |
| GeoDIL number | 528 |
 | |