Crystals and Metaphysics. Crystals are used for healing, meditation, energy work, storing information, protection, grounding, and channeling. Many have specific shapes such as crystal skulls and singing crystal bowls, used for healing, balancing, awakening, and scrying.
It is not easy to explain the term "agate". Very often agate is simply defined as "banded chalcedony", and for most practical purposes this should be sufficient.But the notion of agate also embraces chalcedony variants that do not show any signs of banding, probably because of the long-term use of names like "moss agate" for stones that would simply be more difficult to sell as "moss chalcedony".
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Flint: Flint is a variety of microcrystalline or cryptocrystalline quartz. It occurs as nodules and concretionary masses and less frequently as a layered deposit. It breaks consistently with a conchoidal fracture and was one of the first materials used to make tools by early people.
The hourglass was widely used as a timekeeping device up until the sixteenth century in Western Europe. Its design was simple. Two globes (also called phials or ampules) of glass were connected by a narrow throat so that sand (with relatively uniform grain size) flowed from the upper globe to the lower.