description Agate Overview
Agate is a variety of chalcedony, the microcrystalline form of quartz, usually recognized by bands or other patterns created as silica layers fill a cavity in volcanic or other rock. Its colors and translucency come from fine mineral impurities and changes during deposition, so specimens may show concentric, wavy, moss-like, or fortification patterns. Agate is widely cut into cabochons, beads, slices, and ornaments and is collected for both its geology and its decorative appearance.
help Agate FAQ
What is agate made of?
Agate is a variety of chalcedony, the microcrystalline form of quartz. Its familiar bands form when silica-rich fluids deposit layers inside a cavity in volcanic or other rock.
Why does agate have stripes and different colors?
Agate bands record changing conditions during repeated silica deposition. Trace mineral impurities and differences in translucency create colors ranging from white and gray to red, orange, blue, and black.
How hard is agate for jewelry and carvings?
Agate is mainly quartz, so it has a Mohs hardness of about 7. That makes it suitable for cabochons, beads, cameos, carvings, and polished slices, although it can still fracture if struck.
What is the difference between agate and jasper?
Both are varieties of microcrystalline quartz, but agate is typically translucent and visibly banded or patterned. Jasper is usually more opaque and strongly colored because it contains more mineral impurities.
explore Explore More
Reviews & Comments
Write a Review
Be the first to review
Share your thoughts with the community and help others make better decisions.
