Final answer:
Mineral identification in the field relies on observable properties such as streak, luster, and cleavage. Without a reference figure, it's difficult to determine the test method, but the definitions provide clarity on each. Online tools can assist in identifying minerals based on their physical properties.
The correct answer is none of all.
Step-by-step explanation:
To correctly identify a mineral, geologists perform tests to determine physical and chemical properties of the mineral. Without knowing the figure referenced in the question, it is challenging to identify which test method is being demonstrated. However, I can provide a description of the tests mentioned:
- Luster: This test method involves observing how light interacts with the mineral's surface to determine if it has a metallic or non-metallic appearance.
- Streak: This method is used to find the color of the mineral in powdered form, which may differ from the color of the mineral itself.
- Crystal habit: This refers to the visible external shape of the mineral and is not directly related to testing methods in the field or classroom settings.
- Cleavage: This involves examining the mineral's ability to break along specific planes of weakness to create flat surfaces, which can be observed with or without a hand lens.
For accurate mineral identification, attributes such as hardness, color, texture, cleavage, and fracture are observed carefully. Apps and online resources like MineralID and certain apps can assist with field identification of minerals.