Blue Chalcedony and Picture Jasper Beads

Blue Chalcedony: Hardness 6.5-7 on Mohs scale, typically light to medium blue, sometimes translucent to opaque, waxy luster, microcrystalline quartz structure (trigonal system, but individual crystals are too small to see). Cleavage absent, conchoidal fracture. Picture Jasper: Hardness 6.5-7 on Mohs scale, earthy brown, tan, and sometimes reddish hues with dendritic or orbicular patterns, opaque, dull to vitreous luster, microcrystalline quartz structure with impurities. Cleavage absent, conchoidal fracture.

Chalcedony is a cryptocrystalline form of silica, composed of very fine intergrowths of quartz and moganite. It forms from the slow precipitation of silica-rich fluids in cavities, fissures, and as replacements of other materials in various rock types. Picture Jasper is a variety of chalcedony, characterized by its patterns that resemble landscapes or scenes, formed by Liesegang rings or sedimentation and often contains fine-grained minerals like iron oxides, clays, and other minerals that create its unique patterns. Geological age can vary widely, from relatively recent to millions of years old, depending on the specific deposit.

Both blue chalcedony and picture jasper are primarily used in jewelry (beads, cabochons, carvings) due to their attractive colors and patterns. They are also popular in lapidary arts and for decorative objects. Chalcedony is sometimes used as an abrasive or in precision instruments due to its hardness and durability. Picture Jasper is particularly valued for its distinct scenic patterns.

Blue chalcedony is often associated with properties of calmness and clear communication. The name 'chalcedony' comes from the ancient Greek city of Chalcedon in Bithynia, Asia Minor. Jasper, in general, is an opaque variety of chalcedony, and 'picture' jasper specifically refers to its unique banding and color variations that often create landscapes, desert scenes, or other visual effects. Different types of jasper are named based on their patterns, colors, or origins.

In the field, chalcedony and jasper are often found as nodules, vein fillings, or lining geodes. They can be identified by their distinctive waxy luster (for chalcedony) or dull to vitreous luster (for jasper), hardness (they will scratch glass), and microcrystalline texture, which means individual crystals are not visible to the naked eye. Blue chalcedony is found in various locations worldwide, including Namibia, Brazil, Turkey, and the USA (California and Oregon). Picture Jasper is found in many places including Oregon, Idaho, and other western states in the USA, as well as sites in Africa and Australia. These beads, with alternating light blue and earthy patterned beads, are indicative of blue chalcedony and picture jasper. The small white tag with 'TIB' or '716' is likely a product identifier and not related to the geological specimen itself.