As DreamTowne Jewelry mentioned, there are a huge variety to choose from. The most common one is quartz, which is a very clear looking crystal that you can see in the picture. It is the second most abundant crystal there is, which is also a partial reason why it is so commonly used.
Healing crystals come in many shapes, colors, and sizes.
No crystal healing cannot cure anything
Go visit a CRYSTAL SHOP or METAPHYSICAL STORE, or even better, visit a metaphysical store that SPECIALIZES in CRYSTAL HEALING, The ONLY store in NYC that specializes in Crystal Healing is called ROCK STAR CRYSTALS. They have a Hugh selection of HEALING CRYSTALS in almost any stone you can think of, as well as gemstone metaphysical tools like pendulum, merkaba, pyramids, spheres, massage wands. chakra stones and chakra jewelry and more. They do not do workshops, however, although they do have books about crystal healing.
they look like plastic in texture.
a raichu on meth
Search images.google.com for sulphus crystal to see numerous examples.
A calcite crystal comes in a variety of sizes and shapes. There are some that do look like a diamond to the naked idea but you can tell that they are different if you look closely.
They believe that crystals can be "charged" with this healing energy, in a manner similar to the charging of a flashlight battery. The charged crystal can then be used to alter the energy patterns in the person receiving treatment.
Cirrus Clouds
clearish rhomboids.
Certain stones have certain properties, for both magic and healing. By using those properties many claim to be able to obtain desired results. It is unknown precisely where/when using crystal healing came to be, but it is a centuries old practice. DreamTowne Jewelry
http://therapeuticreiki.com/blog/category/tags/alternative-health-therapy/crystal-healing/
Like my wrinkly ball bag