-
Poikilitic texture refers to
igneous rocks where large later-formed less
perfect crystals ('oikocrysts')
surround smaller early-formed
idiomorphic crystals...
- The ages of
these rocks include 89 Ma for the
lavas and 75 Ma for the
poikilitic sills,
though some
sequences may have
erupted as late as 62–66 Ma, placing...
-
certain dolerites after an
occurrence in the
Pyrenees Ophitic, a type of
poikilitic texture in
igneous rocks Ophitic dialect, a
variant of
Pontic Gr**** This...
-
identified in
metamorphic rocks by its
swiss cheese appearance (with
poikilitic quartz) and
often mantled porphyroblastic character. The name is derived...
- The ages of
these rocks include 89 Ma for the
lavas and 75 Ma for the
poikilitic sills,
though some
sequences may have
erupted as late as 62–66 Ma, placing...
-
crystals or as
large grains enclosing smaller grains of
other minerals (
poikilitic grains).
Geologists use
rigorous quantitative definitions to classify...
- lava
where phenocrysts had
started to form
prior to eruption.
Obsidian Poikilitic texture Tachylite Best,
Myron G. (2002).
Igneous and
Metamorphic Petrology...
- Al2O3)
phenocrystic phlogopite;
titanian (5-10 wt.% TiO2) groundm****
poikilitic "tetraferriphlogopite";
titanian (3-5 wt.% TiO2), pot****ium (4-6 wt.%...
-
subordinate layered diabase. S****line
exposures of quartz,
amphibole diabase,
poikilitic diabase, and
diabase with
pegmatitic patches or
veins are uncommon. Only...
- (large
xenocryst surrounded by fine crystals),
Melange (mix of minerals),
Poikilitic (one
mineral grown around another),
Polymorph (same
composition but different...
