Question

objective #4-identify the name of a mineral based on its physical properties. blue - green color rounded edges scratches a penny but not glass light green streak mineral name = __________________ pearly white doesnt scratch glass cleaves in at 90° in 2 directions mineral name = __________________

Explanation:

• For the first mineral: Based on the Mohs hardness scale, a penny has a hardness of about 3.5. Since the mineral scratches a penny (hardness > 3.5) but not glass (glass has a hardness of about 5.5 - 6.5, so hardness < 5.5 - 6.5). A light green streak and blue - green color with rounded edges (could be due to weathering or formation processes) are characteristics of fluorite.
• For the second mineral: Cleaving at 90° in 2 directions is a characteristic of feldspar. Also, not scratching glass (hardness < 5.5 - 6.5) and pearly white color are in line with feldspar properties.

Answer:

1. Fluorite
2. Feldspar