Buying crystals can be confusing at first, but my favorite method to buying them is to focus on the color. Crystals that are in the same color family usually have similar frequencies that can resonate with specific states of awareness. This method is considered one of the most straightforward method to picking a crystal if you’d like to focus on a specific chakra to work with.
White crystals work with illumination, purity, innocence, unity, lunar energy, freedom and hope, which can represent the crown chakra. Some examples of white crystals that have similar properties are Moonstone, Clear Quartz, Calcite, Selenite, and white forms of Lepidolite, Topaz, and Beryl.
Purple colored crystals focus on intuition, inspiration, trusting your gut feelings as well as your heart and it’s often focused with the third eye chakra. Some examples of crystals are Amethyst and Eudialyte.
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Source: Using Colors to Choose Crystals
Paths I Walk 