Luster Types and Properties in Minerals

The video tutorial explores the concept of luster, a physical property describing how light reflects off the surface of elements. It distinguishes between metallic and non-metallic luster, explaining why metals are shiny due to free electrons. The tutorial also covers various types of non-metallic luster, such as adamantine and greasy, and discusses the gradation of luster across the periodic table, noting how it decreases from left to right and increases from top to bottom.

What is the term used to describe the way light is reflected from the surface of an element?

• Density

• Opacity

• Luster

• Transparency

Which type of luster is associated with elements that appear shiny and metallic?

• Metallic

• Non-metallic

• Pearly

• Greasy

What causes metals to have a shiny appearance?

• High density

• Low melting point

• Presence of free electrons

• High thermal conductivity

Which type of luster is characterized by a diamond-like shine?

• Adamantine

• Vitreous

• Greasy

• Resinous

What type of luster do minerals that appear to be coated with oil exhibit?

• Greasy

• Silky

• Pearly

• Metallic

Which luster type is described as having a glass-like appearance?

• Vitreous

• Adamantine

• Greasy

• Metallic

Which of the following is an example of a mineral with a submetallic luster?

• Quartz

• Diamond

• Hematite

• Opal

Which non-metallic luster type is known for its pearl-like appearance?

• Silky

• Pearly

• Greasy

• Vitreous

How does the luster property change as you move from left to right across a period in the periodic table?

• It remains constant

• It decreases

• It fluctuates

• It increases

What happens to the luster property as you move from top to bottom in a group in the periodic table?

• It decreases

• It increases

• It remains constant

• It disappears