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Jasper – Jasper is a decorative rock composed of chalcedony, microcrystalline quartz, and other various minerals, which give it colorful bands and unique patterns. Jasper means “spotted or speckled stone” and there are many varieties, all with their own names, based on colors, patterns, localities, etc. Jasper is generally red, brown or green, but can also be seen in blues and other colors. Red Jasper is caused by iron inclusions within the mineral.
Jerome Silver Ore – Silver mining was a major driving force in the early exploration of Arizona, USA. With nearly 500 troy ounces produced up to 1981. The town of Jerome, specifically, was founded on copper mines of which silver ore was a by-product. This ore has patterned veins which create a jewelry-worthy pattern when cut into cabochons.
Jet – Jet, or Lignite, is considered a minor gemstone. This black mineraloid is organic; derived from decaying wood over millions of years. This stone is the reasoning behind the common phrase “jet black” as a descriptor to the darkest black color possible. Jet is a lightweight stone and was very popular in the roaring twenties as a long beaded neck lace. Carving Jet is a particularly skilled craft as it is very difficult to carve fine details without breakage.