Luster

Luster refers to the way light interacts with the surface of a mineral. It is an important property used by geologists to help identify minerals. There are two main types of luster: metallic and non-metallic.

Metallic Luster

Minerals with metallic luster appear shiny and reflective, like metal. Examples of minerals with metallic luster include pyrite, galena, and hematite. These minerals are often opaque and have a high density.

Non-Metallic Luster

Minerals with non-metallic luster do not appear shiny and reflective like metal. Instead, they can have a variety of non-metallic lusters, such as vitreous (glassy), pearly, silky, or dull. Examples of minerals with non-metallic luster include quartz, calcite, and talc.

Study Guide

1. What is luster and why is it an important property for identifying minerals?
2. Describe the difference between metallic and non-metallic luster.
3. Give examples of minerals with metallic luster and non-metallic luster.
4. Explain how geologists use luster to help identify minerals in the field.
5. Perform a luster test on several mineral samples and record your observations.

[Luster] Related Worksheets and Study Guides:

• Minerals IIEarth Science • High School
• Rocks, Minerals, and soilScience • Third Grade