Brown Jasper

Hardness: 7 on the Mohs scale; Color: Ranges from golden yellowish-brown to dark brown; Luster: Vitreous (glassy); Crystal Structure: Trigonal, typically found in massive or botryoidal habits, or as cryptocrystalline aggregates like this specimen; Cleavage: None; Specific Gravity: 2.65-2.66

Jasper forms as a chemical sedimentary rock or through hydrothermal processes within various host rocks. It's often found in association with volcanic activity. The exact geological age can vary widely depending on the specific deposit, ranging from Precambrian to relatively recent formations.

Primarily used as an ornamental stone for carvings, cabochons, beads, and polished specimens. Its durability (hardness of 7) makes it suitable for jewelry. Occasionally used for building decoration.

Jasper is often found in various colors due to impurities, and brown jasper's color comes from iron oxides. It has been used for millennia for tools, carvings, and ornamental objects. The term 'jasper' often covers a wide range of microcrystalline quartz varieties, leading to many named patterns and colors.

Field Identification: Look for its typically dull, earthy luster on unpolished surfaces and its characteristic color. It often has a conchoidal fracture like other quartz varieties. It is opaque. Common Locations: Found worldwide in various geological settings, including the USA (Oregon, California, Idaho), Russia, India, Egypt, and Australia. Tips for Collectors: Brown jasper is common and relatively inexpensive, making it a good beginner's stone. Look for interesting patterns and solid, uniform coloration.