Our navigation bar is loading . . . . . .


Advertise on JCSM - Hear JCSM's Weekly Devotions via Podcast/RSS Feed! - Skip These Ads

You can advertise your site right here!Click here to learn more!

 10,000 Wise Quotes and Spiritual Sayings by Jason Gastrich, Ph.D.

 JCSM's Top 1000 Christian Sites - Free Traffic Sharing Service! Join the Online Christ-Centered Ministries!

-
Jesus Christ Saves Ministries

Click here and add this page to your favorites!

Return to the JCSM Study Center!

Encyclopedia Britannica



PYROXENE

This article appears in Volume V22, Page 696 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: PYR-RAY
PYROXENE , an important group of
rock
 -forming minerals, very similar in chemical composition and general characters to the amphiboles (q.v.). Although crystallizing in three different systems, they all possess distinct prismatic cleavages, the angles between which are about 87 (the cleavage angle in the amphiboles being 56). They are metasilicates, but, as shown in the following table, the composition varies widely in the different species, with corresponding differences in the various physical characters. The name pyroxene was originally given by R. J. Haiiy in 1796 to the black crystals of augite found in the lavas of
Vesuvius
  and Etna: he derived the name from the Greek a6p (fire) and ivos (a stranger), because he thought that the crystals had been accidentally caught up by the lavas which contained them. As a matter of fact, the pyroxenes are, next to the felspars, the commonest constituents of igneous rocks of almost all kinds, being especially characteristic of those of basic composition. An igneous
rock
  composed almost wholly of pyroxene is known as a pyroxenite. Besides being minerals of primary origin in igneous rocks, the pyroxenes are also of frequent occurrence in metamorphic rocks, for example, in crystalline limestones, being then of secondary origin.
At the present day the name pyroxene is used as a group name for all the minerals enumerated below, though sometimes it is also applied as a specific name to include the monoclinic members
diopside
 , hedenbergite, schefferite and augite.
Orthorhombic
Series
 .
Enstatite
  MgSiOi.
Bronzite (Mg,Fe)SiOi.
Hypersthene (Fe, Mg) SiOa.
Monoclinic
Series
 .
Diopside
  CaMg(SiOa)2.
Hedenbergite CaFe(SiOa)z.
Schefferite (Ca,Mg) (Fe,Mn) (SiOa)2.
Augite Ca(Mg,Fe)(SiO3)2with (Mg,Fe)(Al,Fe)2SiO6.
Acmite NaFe ";SiOa)2.
Spodumene LiAl(SiO3)2.
Jadeite NaAI(SiOa)2.
Wollastonite CaSiO3.
Pectolite HNaCa2(SiO3)a.
Rosenbuschite Na2Caa[(Si,Zr,Ti)Oa]a. Anorthic Series.
Rhodonite MnSiO3.
Babingtonite (Ca,Fe,Mn)SiO8.Fe2"'(SiO3)a.
Hiortdahlite (Ca,Na)2F[(Si,Zr)02].
For details respecting the
special
  characters and modes of occurrence of most of these species reference may be made to the respective headings: others not so treated are briefly mentioned below. Hedenbergite, or calcium iron pyroxene, is a black
mineral
  closely allied to diopside (q.v.) and, owing to the isomorphous replacement of iron by magnesium, there is no
sharp
  line of division between them. Schefferite, or manganese pyroxene, is a brown
mineral
  found in the manganese mines of Sweden. Pectolite is a secondary mineral occurring as white masses with a radially fibrous structure in the veins and cavities of basic igneous rocks. Babingtonite is found as small black crystals on felspar in the granite of Baveno in Italy, and in the Haytor iron mine in Devonshire. Rosenbuschite, hiortdahlite, and some other rare members containing zirconium and fluorine, occur as accessory constituents in the nephelinesyenite of southern Norway.


End of Article: PYROXENE


If you wish, you can link directly to this article.
<a href="http://jcsm.org/StudyCenter/Encyclopedia/PYR_RAY/PYROXENE.html">
PYROXENE
</a>
(Previous)
PYROPHYLLITE 		(Next)
PYROXENITE

 


 

Jesus Christ Saves Ministries

The JCSM Study CenterAmerica's Christian FoundationSkeptic's Annotated Bible: Corrected and ExplainedNKJV Web Hosting and Services
JCSM's Sermons, Debates and the Bible on MP3The Online Christ-Centered MinistriesDo You Have A Web Site?  Your Ad Could Be Here!Seminary Notes and PapersThe Picturesque Photo Albums


Jesus Christ Saves Ministries, P.O. Box 70696, Pasadena, CA 91117

JCSM is a 501(c)(3), non-profit organization. Copyright © 1997-present.


Kingdom Debt Solutions - Be Debt Free! Sport Logos - Quality Athletic Equipment The JCSM Study Center Your Ad Could Be Here! Launch A Successful Internet Organization or Business! Learn Guitar, Bass, or Piano in San Diego county!

You can advertise your site right here!

Free & Cheap Cell Phones  |  Cheap Long Distance Phone Service Carriers  |  Talk America Local Phone Service  |  Ztel & MCI - Unlimited Long Distance
Compare Cell Phone Plans & Companies  |  International Calling Cards & Prepaid Phone Cards  |  Voice Over IP Broadband Internet Phone Service  |  Wireless Phone Plans & Cheap Cell Phones

Dr. Jason Gastrich

Jason Gastrich, Ph.D.

 

Jesus Christ Saves Ministries is directed by Dr. Jason Gastrich.  It was founded in 1997 and it exists to bring people into a life-changing and productive relationship with Jesus Christ.  JCSM offers over 200,000 free web pages, discussion boards, weekly html and mp3 devotionals, free email accounts, and much more.

Jesus Christ Saves Ministries
P.O. Box 9297
San Diego, CA  92169
1-877-850-3878 or Email

JCSM is a 501(c)(3), non-profit organization. Copyright © 1997-2008.

_____________________________________________________________________________

Online First Aid and CPR Certification  .  The Online Christ Centered Ministries  .  The Skeptic's Annotated Bible: Corrected and Explained  .  The Inerrancy Discussion Board  .  Free Email Accounts  .  Home Equity Loans  .  JasonGastrich.com  .  The Missions, Apologetics, and Creation Bible Conference  .  Young Earth Creation Science  .  San Diego Music Lessons  .  10,000 Wise Quotes and Spiritual Sayings  .  Gastrich.net  .  Maximizing the Internet: 12 Keys to Success  .  Louisiana Baptist University  .  NKJV Web Hosting and Services  .  Michael Newdow  .  San Diego Soccer Training  . Christian Guitar Lessons  .  Jesus Christ Saves Ministries  .  Eternal Security