 970,904,922 visitors served. | 
|
 Dictionary/ thesaurus |  Medical dictionary |  Legal dictionary |  Financial dictionary |  Acronyms |  Idioms |  Encyclopedia |  Wikipedia encyclopedia | ? |
feldspathoid |
Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia | 0.07 sec. |
feldspathoidAny of a group of silicate minerals resembling feldspars but containing less silica. Examples are nepheline (NaAlSiO4 with a little potassium) and leucite (KAlSi2O6). Feldspathoids occur in igneous rocks that have relatively high proportions of sodium and potassium. Such rocks may also contain alkali feldspar, but they do not generally contain quartz because any free silica would have combined with the feldspathoid to produce more feldspar instead. |
|
Printer friendly
Cite / link
Email
Feedback
? Mentioned in | ? References in periodicals archive | |
|---|---|---|
Alkali-rich rocks and feldspathoidal rocks are tare (feldspathoids and quartz are mutually exclusive) and plagioclase typically dominates over alkalifeldspar. |
feldspathoidal
 |
| Free Tools: |
For surfers:
Browser extension |
Word of the Day |
Help
For webmasters: Free content NEW! | Linking | Lookup box | Double-click lookup | Partner with us |
|
|---|
Disclaimer |
Privacy policy |
Feedback | Copyright © 2008 Farlex, Inc.All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. Terms of Use.