How do you test luster of a mineral?

http://jersey.uoregon.edu/~mstrick/MinRockID/MinTests.html

how do you test luster

To test the luster of a mineral, you can follow these steps:

1. Collect the necessary materials: You will need a mineral sample, a light source (such as a flashlight or lamp), and a magnifying lens (optional).

2. Examine the mineral's surface: Begin by observing the mineral's surface in good lighting conditions. Look for how it reflects light and determine if it appears shiny or dull.

3. Identify the type of luster: There are several types of luster, including metallic, submetallic, non-metallic, vitreous (glassy), pearly, silky, greasy, resinous, and earthy. Try to match the mineral's appearance to one of these categories.

4. Observe reflectivity: Certain minerals have a metallic luster, which means they reflect light like metal. Look for a high degree of reflectivity and a mirror-like appearance.

5. Study non-metallic luster: If the mineral does not have a metallic luster, examine its non-metallic luster properties. These can include vitreous (glassy), pearly (like the inside of a seashell), silky (like silk fabric), greasy (like the surface of an oily substance), resinous (like hardened tree sap), or earthy (dull and matte).

6. Use a magnifying lens: To get a closer look at the mineral's surface features, you can use a magnifying lens. This can help you determine if it has a fine-grained texture or any other characteristics that affect its luster.

Remember, luster is a subjective property and can vary depending on the observer's perception, so it's recommended to compare the mineral's appearance with known mineral samples or consult with experts if needed.