BOSTONITE

This article appears in Volume V04, Page 297 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: BOS-BRI

BOSTONITE , in petrology, a fine-grained,

pale

PALE (through Fr. pal, from Lat. palms, a stake, for paglus, from the
stem
- STEM (O. Eng. staefn, stemn, cf. Du. stain, Ger. Stamm, &c., probably related to " staff ")
pag- of pangere, to fix; "
pole
" is from the same original source)

-coloured, grey or pinkish

rock

, which consists essentially of alkali-felspar (orthoclase, microperthite, &c.). Some of them contain a small amount of interstitial quartz (quartz-bostonites); others have a small percentage of lime, which occasions the presence of a plagioclase felspar (maenite, gauteite, lime-bostonite). Other minerals, except apatite, zircon and magnetite, are typically absent. They have very much the same composition as the trachytes; and many rocks of this

series

SERIES (a Latin word from serere, to join)

have been grouped with these or with the orthop,hyres. Typically they occur as dikes or as thin sills, often in association with nepheline-

syenite

SYENITE

; and they seem to

bear

a complementary relationship to certain types of lamprophyre, such as camptonite and monchiquite. Though nowhere very common they have a wide distribution, being known from

Scotland

, Wales,

Massachusetts

MASSACHUSETTS (an Indian name, originally applied to a tribe of Indians)

, Montreal, Portugal, Bohemia, &c. The lindoites and quartz-lindoites of Norway are closely allied to the bostonites.

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