Geology Quiz

Where is feldspar commonly found?

• Only in igneous rocks

• Only in sedimentary rocks

• In all rock types

• Only in metamorphic rocks

What is the general chemical formula for Feldspar?

• (Ca,Na,K)Al(Al,Si)4O8

• (Na,Ca)SiO3

• (K,Na)AlSi3O8

• (Ca,Na)Al2Si2O8

Which elements are included in the Feldspar chemical composition?

• Silicon, Aluminum, and Oxygen

• Carbon, Hydrogen, and Nitrogen

• Iron, Magnesium, and Sulfur

• Phosphorus, Chlorine, and Argon

Which elements can substitute within the crystal structure of Feldspar?

• Sodium, Potassium, or Calcium

• Iron, Copper, or Zinc

• Magnesium, Lead, or Tin

• Carbon, Nitrogen, or Oxygen

What is the basic structure of a Feldspar crystal based on?

• Carbon tetrahedra

• Aluminosilicate tetrahedra

• Phosphate tetrahedra

• Sulfate tetrahedra

What ions are found at the center of each tetrahedron in a Feldspar crystal?

• Carbon or Nitrogen ions

• Aluminium or Silicon ions

• Phosphorus or Sulfur ions

• Calcium or Magnesium ions

What type of crystal structure does Feldspar have?

• Cubic

• Hexagonal

• Triclinic

• Tetragonal

What percentage of the Earth's lithosphere is made up of feldspar minerals?

• 40%

• 50%

• 60%

• 70%

Feldspar is a very common mineral found in which type of rocks?

• Mars rocks

• Moon rocks

• Sun rocks

• Venus rocks

The name "Feldspar" is derived from which two German words?

• Feld and Stein

• Feld and Spath

• Stein and Spath

• Stein and Berg