Quartz - The Master Crystal. Amplification of one's intention, clearing, cleansing, healing. All chakras. 1.25+" cluster.
Rose Quartz - Love, emotional healing, release of stress, uniting with the Divine. Heart chakra. 1.5+" raw/rough, very "gemmy", high quality
Black Quartz aka Morion Quartz - Aids forgiveness, compassion and love. Develops psychic activity. Root + Earth Star chakras.