Macro crystalline varieties:
Rock Crystal is pure, clear Quartz, often with a milky base. Its properties are listed on this page.
Amethyst is pale purple to deep violet; known as the Bishop’s Stone, it represents royalty and spirituality, and is a crystal of creativity.
Ametrine is a combination of Amethyst and Citrine in the same stone; a “stone of the muses,” it connects spirituality, action and overcoming fear.
Aventurine may be green, blue or reddish-brown with a metallic iridescence; it is a stone of optimism, leadership and prosperity.
Blue Quartz is clear Quartz with tiny blue inclusions that create a pale to mid-blue color; it brings harmony and order, mental clarity and eases fear.
Citrine is transparent and pale to golden yellow; it promotes imagination and magnifies the powers of personal will and manifestation.
Milky or Snow Quartz, also known as Quartzite, is opaque white quartz; it is supportive for lesson learning, realizing limitations and utilizing tact.
Pink or Rose Quartz is pale to deep reddish-pink, opaque to translucent; a “stone of love,” it promotes compassion, appreciation and soothing calm.
Prase is a leek-green Quartzite (rock rather than a mineral) with actinolite inclusions; an “earth mother” stone, it resolve conflicts and calms nerves.
Prasiolite is Green Amethyst; leek-green and rare naturally, it is often heat-treated; it provides a bridge between the body, mind and spirit.
Smoky Quartz is transparent smoky brown to dark gray; it is a premiere grounding stone, dissipating emotional and environmental negativity.
Tiger’s, Hawk’s, and Cat’s Eye is Quartz layered with chatoyant strips of asbestos and hornblende; Tiger’s Eye is golden brown, Hawk’s or Falcon’s Eye is blue-black, and Cat’s Eye is green to greenish-gray. These are stones of action, pride, protection, and reflecting back negative energies.
Cryptocrystalline or microcrystalline varieties have a dense structure and show no visible crystals. They are often grouped together and referred to as “Chalcedony.” They are divided into two groups.