Lab exam

Basalt-Igneous extrusive rock. fine-grained, mainly composed of plagioclase and pyroxene minerals. more fine grained then gabbro

Granite-intrusive igneous rock. course grained, light coloured, felsic. Composed of quartz and feldspar, with some micas and amphiboles.

Basalt-Igneous extrusive rock. fine-grained, mainly composed of plagioclase and pyroxene minerals. more fine grained then gabbro

Pumice- felsic igneous rock. light-colored, extremely porous. composition is too fine to see.

Rhyolite- Extrusive igneous rock fine grained and light colored (felsic) can be pink or gray in color. can be vesicular. composition too fine to see

Gabbro-intrusive igneous rock course grained, mafic.black or green. composition ca-plagioclase rich fledspar, pyroxene, minor amounts of olivine

Andesite-extrusive igneous rock. intermediate, fine-grained. Composition: plagioclase feldspar, biotite, pyroxene, amphibole. no quartz usually

Obsidian-extrusive igneous rock glassy texture break with conchoidal fracture. black Composition: too fine to see

Conglomerate- clastic sed. contains large rounded clasts. cemented together. composition:can have a variety depending on where it came

Breccia- large Angular fragments cemented together about 2 mm in diameter.

Arkose- clastic sed. a feldspar-rich sandstone rough and dull. reddish brown

Quartz- clastic sed. white to light tan. course texture feels like sand.

Shale- clastic sed. more fine-grained then siltstone, forms from mud, and breaks into layers in 1 direction,

siltstone- clastic sed. more fine grained then sandstone

fossiliferous limestone- biogenic sed. composed mostly of calcite light to medium gray. softer than glass

chert- biochemical sed. breaks with conchoidal fracture and produces very sharp edges. can come in a variety of colors.

Gneiss- foliated metamorphic rock.It is this banded appearance and texture - rather than composition - that define a gneiss. High grade,coarse grained

Schist- high grade foliated metamorphic rock. lower grade then Gneiss so less coarse.

Slate- low grade foliated metamorphic rock. looks alot like shale but is way more durable with a little bit more noticable foliation

Quartzite- non-foliated metamorphic rock composed almost all of quartz, it is a metamorphized sandstone very tough and strong.

Marble- metamorphic rock protolith limestone so composed a lot of calcium, will react with cold HCl.

Greenstone- was Basalt, the olivine, and peridotite that it was made of have been metamorphosed by high pressure and warm fluid into green minerals.