-
Shonkinite is an
intrusive igneous rock
found in few
places in the world. It is
unique in
having low silica,
feldspathoid minerals, and
large blocky crystals...
-
rhyolite type of
volcanic rock Scoria – Dark
vesicular volcanic rock
Shonkinite –
Intrusive igneous rock – a
plutonic rock Sovite –
Igneous rock – A co****-grained...
- than
calcic plagioclase theralites grade into
foidal syenite,
including shonkinite.[citation needed]
Pyroxene in
these rocks may be of
green colour or purplish-brown...
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include ijolite, melteigite, teschenite, lamprophyres, phonolite, foyaite,
shonkinite,
silica undersaturated foid-bearing
pyroxenite (es****ite), and nepheline...
- form in the
cooling magma. In
other cases less
viscous magma such as
shonkinite may form
phenocrysts of
augite at depth, then
inject through a vertical...
- the
largest eruptive centers in the
Central Montana Alkaline Province.
Shonkinite, latite, &
tinguatite are
among the most
common igneous rock compositions...
-
between two
layers of
sedimentary rock.
Significant amounts of
syenite and
shonkinite can be
found in the laccolith. The
Shonkin Sag
laccolith is
cited by geologists...
- Adel
Mountains Volcanic Field is a
significant and
abundant source of
shonkinite, a very
uncommon type of
intrusive igneous rock
found primarily in Montana...
-
complex intruded older Precambrian rocks with
nepheline syenite, gabbro,
shonkinite and clinopyroxenite.
Alkali basalt erupted in
Paraiba and Rio
Grande do...
-
studies with USGS and
discovered several new rock types, for example,
shonkinite. In 1897 he was
promoted to a full professor. In 1902 he
married Eliza...
