Final answer:
Turquoise, azurite, and malachite are similar because they are all vibrant copper-based minerals often found together in copper-rich mining areas.
Step-by-step explanation:
Turquoise, azurite, and malachite are all similar because they are copper-based minerals that are often found in association with one another. These minerals are known for their vibrant colors, which are due to the presence of transition metals in their structures. Specifically, malachite and azurite both contain copper, which contributes to their rich green and blue colors, respectively. Additionally, they often occur together in mining areas known for copper deposits, like those in Arizona, which enhances their similarities in the context of geology and extraction.