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Lake Superior agate is a type of agate found primarily near the shores of Lake Superior. It can also be found in interior regions of the U.S. states of Minnesota , Michigan , Wisconsin , Iowa , Nebraska , Kansas , and Missouri , and in the Canadian province of Ontario .
Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases, [1] [2] is an opaque, [3] impure variety of silica, usually red, yellow, brown or green in color; and rarely blue. The common red color is due to iron(III) inclusions. Jasper breaks with a smooth surface and is used for ornamentation or as ...
[6]: 99 Holley blue agate (also spelled "Holly blue agate") is a rare lavender to blue agate found only near Holley, Oregon. [6]: 103 Patuxent River stone is a red and yellow form of agate only found in Maryland, where it is the state gem. [23] Sweetwater agates are small moss agates found in Miocene age sandstone near Sweetwater River, Wyoming.
Montana Agate (1969) Nebraska [45] Prairie agate (1967) Blue chalcedony (1967) Nevada [46] [47] Metal: Silver (1977); Nevada's nickname is the Silver State: Sandstone (1987) Precious Gemstone: Virgin Valley black fire opal (1987) Semiprecious Gemstone: Nevada turquoise (1987) New Hampshire [48] Beryl (1985) Granite (1985); New Hampshire's ...
Concretion rock with white core from the Middle Jurassic of Iran. Detailed studies have demonstrated that concretions form after sediments are buried but before the sediment is fully lithified during diagenesis.
Threshing boards with lithic flakes are used in agriculture from Neolithic, and are still used today in the regions where agriculture has not been mechanized and industrialized. Glassy stones (flint, quartz, jasper, agate) were used with a variety of iron pyrite or marcasite stones as percussion fire starter tools. That was the most common ...
Orbicular jasper from Madagascar. Orbicular jasper is a variety of jasper which contains variably-colored orbs or spherical inclusions or zones. In highly silicified rhyolite or tuff, quartz and feldspar crystallize in radial aggregates of needle-like crystals which provide the basis or seed for the orbicular structure seen in this kind of jasper. [1]
Biggs jasper is a variety of the mineral jasper. It is a "picture jasper" – a jasper that exhibits particular patterns and colors – and is used as an opaque gemstone . [ 1 ] It exhibits intricate, shell- or layer-like patterns in shades of brown ranging from beige to dark brown.
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