To open, clear, balance, activate and energize all the chakras:
Clear quartz, Herkimer diamond both high energy stones.
Place on each chakra use double-terminated to flow the energy both up from the earth and down from the cosmos.

Double terminators can also be placed between chakras to enhance flow between them.

Activating and stimulating all the chakras: Clear quartz, garnet
Aligning all the chakras: Yellow kunzite, blue Kyanite

Grounding energy from crown to root: Smoky quartz

Cleansing the lower chakras: Bloodstone

Using crystals with chakra meditation:

Remember to love yourself and your crystals and that you can program them with your loving intent for balancing your chakras.

Don't forget to cleanse them afterward, with gratitude, for all their help and healing!