Petrology Quiz 3

What are the primary minerals in igneous rocks?

• Graphite, sulfur, and bauxite

• Feldspar, quartz, mica, and pyroxene

• Calcite, dolomite, and hematite

• Gypsum, halite, and talc

Name a felsic mineral commonly found in granite.

• Gabbro

• Mica

• Basalt

• Quartz

What is the chemical formula for Quartz?

• SiO3

• Si2O4

• SiO2

• SiO

Which feldspar is potassium-rich?

• Orthoclase

• Plagioclase

• Mica

• Quartz

Name a common mineral found in mafic rocks.

• Feldspar

• Olivine

• Quartz

• Calcite

Which group does Hornblende belong to?

• Amphibole group

• Feldspar group

• Mica group

• Quartz group

What type of minerals are Magnetite and Zircon classified as?

• Magnetite is a carbonate mineral; Zircon is a phosphate mineral.

• Magnetite is a sulfide mineral; Zircon is a native element.

• Magnetite is an iron oxide mineral; Zircon is a silicate mineral.

• Magnetite is a silicate mineral; Zircon is an oxide mineral.

What is the role of accessory minerals in igneous rocks?

• Accessory minerals are only found in sedimentary rocks.

• Accessory minerals have no significance in rock formation.

• Accessory minerals provide insights into the formation conditions and history of igneous rocks.

• Accessory minerals are the primary components of igneous rocks.

Which mineral is a common mica found in intermediate rocks?

• Biotite

• Calcite

• Quartz

• Feldspar

Name a rock type that contains Pyroxene minerals.

• Sandstone

• Limestone

• Granite

• Basalt