igneous rocks?

Question

i need information!
i need the minerals that make up/are inside of the following minerals:
~pegmatite
~diorite
~basalt
~obsidian
~andesite
~rhyolite? (is there info for that?)

thank you sooo much!

Answer 1

Igneous Rock:
Most Important + Minor
Minerals Minerals
Rock Type:
(P) plutonic / intrusive
(V) volcanic / extrusive

DIORITE (P):
plagioclase and/or orthoclase + amphibole and biotite

ANDESITE (V):
plagioclase and/or orthoclase + amphibole, biotite

BASALT (V):
plagioclase, proxene + olivine, amphibole

RHYOLITE (V):
orthoclase, quartz, plagioclase + biotite, amphibole

PEGMATITE (P):
quartz, feldspar, mica

OBSIDIAN (V):
essentially all glass

Answer 2

The terms are all rocks, not minerals.

Pegmatite is a name give to any very coarse grained intrusive igneous rock. Granitic pegmatites are most common (alkali feldspar + quartz +/- other minerals), but other types also occur. They have no fixed mineralogy.

Diorite - coarse grained intrusive igneous rock comprising >10% and <90% plagioclase. The variety of plagioclase is either andesine or oligoclase. Quartz and alkali feldspar (albite, orthoclase, anorthosclase, sanidine), and feldspathoids are either absent, or present only in very small quantities. The plagioclase is usually accompanied by hornblende or a pyroxene.

Basalt - fine grained igneous rock (intrusive or extrusive) comprising >10% and <90% plagioclase. The variety of plagioclase is either labradorite or anorthote. The plagioclase is accompanied by pyroxene. Quartz, alkali feldspar and feldspathoids are either absent or present only in small quantities. Olivine is commonly present.

Obsidian - volcanic glass - basically lava that has frozen without crystallising. It contains no minerals.

Andesite - fine grained equivalent of diorite. Intrusive or extrusive.

Rhyolite - fine grained igneous rock (intrusive or extrusive) comprising alkali feldspar and quartz. Dark minerals such as hornblende and mica may be present in small quantities.