How Minerals Form. Formation of Minerals. Geology, Mineralogy. Crystals, Igneous, Metamorphic

Some moon rocks have coarse intergrown crystals composed of plagioclase feldspar, hornblende, and olivine. These moon rock samples are most similar to Earth rock samples of...

• gabbro

• marble

• brecchia

• pumice

Which igneous rock, when weathered, could produce sediment composed of the minerals potassium feldspar, quartz, and amphibole?

• gabbro

• granite

• andesite

• basalt

The photograph below shows actual crystal sizes in a light-colored igneous rock that contains several minerals, including potassium feldspar, quartz, and biotite mica.

• granite

• gabbro

• basalt

• rhyolite

The diagram represents a geological cross-section. In which location is a geologist most likely to find a rock composed of intergrown crystals?

• A

• B

• C

• D

Tags

NGSS.MS-ESS1-4

The graph represents the percentage of each mineral found in a sample of igneous rock. What mineral is represented by letter X on the graph?

• potassium feldspar

• plagioclase feldspar

• quartz

• biotite

The photograph shows the intergrown crystals of a pegmatite rock. Which characteristic provides the best evidence that the pegmatite solidified underground?

• low density

• light color

• felsic composition

• very coarse texture

In which group do the rocks usually have the mineral quartz as part of their composition?

• granite, rhyolite, sandstone, hornfels

• shale, scoria, gneiss, metaconglomerate

• conglomerate, gabbro, rock salt, schist

• breccia, fossil limestone, bituminous coal, siltstone

The table shows the physical properties of nine minerals. Which mineral is commonly found in granite?

• quartz

• olivine

• magnetite

• granite

Tags

NGSS.MS-PS1-1

Large crystal grains in an igneous rock are an indication that the crystals formed

• over a long period of time

• under low pressure

• near the surface of the Earth

• at a low temperature

Biotite mica and muscovite mica have different chemical compositions. Compared to the agma from which biotite mica forms, the magma from which muscovite mica forms is usually...

• more mafic and less dense

• more mafic and more dense

• more felsic and less dense

• more felsic and more dense

Tags

NGSS.MS-PS1-1