Crystals and stones are gifts of the Goddess and God. They are sacred, magickal tools which can be used to enhance ritual and magick. Here are some of the ways of Earth magick.
PREPARING THE CIRCLE: The magick circle can be laid out with crystals and stones, if desired, rather than with herbs.
Beginning and ending in the North, lay 7, 9, 21 or 40 quarts crystals of any size around the circle, either inside the cord or in place of it.  If the ritual to be conducted within the circle is of a usual spiritual or magickal nature, place the quartz crystals with points outward.  If of a protective nature, place with points facing inward.
If you use candles to mark the four quarters of the magick circle rather than large stones, ring each candle with any or all of the following stones:
North: Moss Agate, Emerald, Jet, Olivine, Salt, Black Tourmaline East: Imperial Topaz, Citrine, Mica, Pumice South: Amber, Obsidian, Rhodochrosite, Ruby, Lava, Garnet West: Aquamarine, Chalcedony, Jade, Lapis Lazuli, Moonstone, Sugilite       A Stone Altar:
To make this altar, search through dry riverbeds and seashores for a variety of smoothly-shaped stones. Or check rock shops for appropriate pieces.
Create the altar itself of three large stones. Two smaller ones of even size are used as  the base, while a longer, flat stone is placed on top of these to form the altar itself.  On this place one stone to the left of the altar to represent the Goddess.  This might be a natural, river-rounded stone, a holed stone, a quartz crystal sphere, or any of the stones related  to the Goddess which are listed below.
To the right of the altar, place a stone to represent the God. This might be a piece of lava, a quartz crystal point, a long, thin or club-shaped rock or a God-symbolic stone such as those presented below.
Between these two stones place a smaller stone with a red candle affixed to it to represent the divine energy of the Goddess and God as well as the element of Fire.
Before this, place a flat stone to receive offerings of wine, honey, cakes, semi-precious stones, flowers and fruit.
A small, cupped stone (if one can be found) should be set to the left of the offering stone.   Fill this with water to represent that element. To the right of the offering stone place a flat rock. Pour salt upon this to symbolize the element of Earth.
Additionally, another flat stone can be placed before the offering stone to serve as an incense burner.
Use along, thin, terminated quartz crystal as a wand and a flint or obsidian arrowhead for the Athame.
Any other tools which are needed can simply be placed on the altar. Or, try to find stone alternatives to them.
This can be used for all types of Craft rituals.
Stones Of The Goddesses:
In general, all pink, green and blue stones; those related to the Moon or Venus; Water and Earth-ruled stones, such as peridot, emerald, pink tourmaline, rose quartz,  blue quartz, aquamarine, beryl, kunzite and turquoise.
Stones which are related to specific deities follow.
Aphrodite: salt Ceres: emerald Coatlicue: Jade Cybele: jet Diana: amethyst, moonstone, pearl Freya: pearl The Great Mother: amber, coral, geodes, holed stones Hathor: turquoise Isis: coral, emerald, lapis lazuli, moonstone, pearl Kwan Yin: jade Lakshmi: pearl Maat: jade Mara: beryl, aquamarine Nuit: lapis lazuli Pele: lava, obsidian, peridot, olivine, pumice Selene: moonstone, selenite Tiamat: beryl Venus: emerald, lapis lazuli, pearl
Stones Of The God:
Generally, all orange and red stones; stones related to the Sun and  Mars; Fire and Air-ruled stones, such as carnelian, ruby, garnet, orange calcite, diamond, tiger’s eye, topaz, sunstone, bloodstone and tourmaline.
Stones which are related to specific deities follow. Aesculapius: agate Apollo: sapphire Bacchus: amethyst Cupid: opal Dionysus: amethyst Mars: onyx, sardonyx Neptune: beryl Odin: holed stone Poseidon: beryl, pearl, aquamarine Ra: tiger’s eye Tezcatlipoca: obsidian
[Pearl and coral have been mentioned in these lists as “stones” because they were anciently thought to be such. Our knowledge of them as products of living creatures leaves us with the ethical question of whether or not to use them in ritual.  This must be a  personal decision.  Beach gathered coral and shells (mother of pearl is from shells) can be  used without conflicting with the above statement because the creature has already died by the time the item was found. If you decide not to use them, just remember leather is also a product of a living creature.]
CAIRNS: In earlier times, throughout the world, people built mounds or piles of stones. These were sometimes formed to mark the passage of travelers, or to commemorate some historic even, but such cairns usually had ritual significance.
In magickal thought, cairns are places of power. They concentrate the energies of the stones used to create them. Cairns are rooted in the Earth but lift upward to the sky, symbolically representing the interconnectedness of the physical and spiritual realms.
During outdoor circles, a small cairn, composed of no more than nine or eleven rocks, can be fashioned as each point of the Circle of Stones. This can be done prior to creating the circle itself.
The next time you’re in some wild, lonely place with a profusion of stones, clear a place among them and sit.  Visualize a magickal need. As you visualize, grasp a near-by stone.   Feel the energy beating within it  – the power of the Earth, the power of nature. Place it on  the cleared ground. Pick up another stone, still visualizing you need, and set it next to the first.
Still visualizing, continue to add stones, building them into a small pile. Keep adding stones until you feel them vibrating and pulsating before you. Place the last rock on top of  the cairn with firm ritual intent – affirm to yourself, to the cairn and the Earth that with this final magickal act you’re manifesting your need.
Place your hands on either side of the pile. Give it your energy through your visualization.  Nurse it. Feed it strength and see your need as being fulfilled.
Then leave the cairn alone to do its work.A QUARTZ AND CANDLE SPELL: Have a candle of the color symbolic of your magickal need, according to the following list (or as your intuition tells you):
WHITE – Protection, Peace, Purity, Truth, Sincerity, Spirituality
RED – Strength, Health, Vigor, Sexual Love, Passion, Protection, Courage, Danger, Warning, Anger, Element of Fire, God oriented, Male aspects
LIGHT BLUE – Tranquillity, Happiness, Understanding, Patience, Health, Element of Water, Goddess oriented, Feminine aspects
DARK BLUE – Impulsiveness, Depression, Changeability, psychism
GREEN – Finance, Fertility, Luck, Growth, Employment, Element of Earth, Goddess                  oriented, Feminine aspects
GOLD/YELLOW – Attraction, Persuasion, Charm, Confidence, Intellect, Study, Divination, Element of Air, God oriented, Male aspects, (Gold) The Great God, The Sun
BROWN – Hesitation, Uncertainty, Neutrality, Healing Animals, Poverty
PINK – Honor, Love, Morality, Friendship
BLACK – Protection from, absorption Evil, loss, discord & Confusion, Lack of color and vibrations, Neutrality, Element of Akasha, Spirituality, The Divine, The Void
PURPLE – Relief from; Tension, Calming, Healing of severe Disease, Spiritualism, Meditation, Protection, Psychic Power, Element of Akasha, The Divine
SILVER/GRAY – Cancellation, Neutrality, Stalemate,(Silver) The Great Goddess, The Moon
ORANGE – Encouragement, Adaptability, Stimulation, Attraction, Energy
GREENISH YELLOW – Sickness, Cowardice, Anger, Jealousy, Discord
With the tip of a cleansed, terminated quartz crystal, scratch a symbol of your need onto the candle. This might be a heart for love, a dollar sign for money, a fist for strength.   Alternately, use an appropriate rune or write your need on the candle with the crystal.
As you scratch or draw, visualize your need with crystal clarity as if it had already manifested. Place the candle in a holder. Set the crystal near it and light the wick.
As the flame shines, again strongly visualize. The crystal, candle and symbol will do their work.