Camphor powder
Cinnamomom camphora
Distilled from the wood of a large tree associated with Kuan Yin, goddess of mercy, who hears the cries of all beings, this resin is traditionally associated with the Moon on account of its whiteness and its cold scent. Indeed, it looks exactly like "wet" snow.  Its scent helps boost clairvoyance and aids in divination by dreams, and it is added to water used in scrying. This resin has a cooler and more complex smell than most, penetrating but good. Do not burn. Instead, simply set out a very small piece of it, and the scent will readily fill the air (this resin sublimes--goes from solid to gas--at room temperature). This method seems appropriate with such a Moon substance. Make sure you use it only in a well ventilated area, preferably outside. Do not eat--camphor will ulcerate mucous membranes. Also, wear gloves whenever handling this resin, and be very careful to clean up any "crumbs." It is very easily absorbed through the skin and can cause muscle spasms, even convulsions. Especially keep away from children and animals. 

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Discontinued due to toxicity - I have just found a source for the ground wood instead, which is much safer. Until it comes in, try using Camphor essential oil or round cardamom instead

Uses in Witchcraft & Magick:

Honoring Kuan Yin
Scrying
Divination
Dreamwork
Clairvoyance
Moon Incense