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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 ...
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]
Breccia is composed of coarse rock fragments held together by cement or a fine-grained matrix. [5] Like conglomerate, breccia contains at least 30 percent of gravel-sized particles (particles over 2mm in size), but it is distinguished from conglomerate because the rock fragments have sharp edges that have not been worn down. [6]
Biggs jasper was first found around 1960 at the bottom of a creek near Biggs Junction, Oregon, after possibly being carried some distance by water from the outcrop where it originated. More of the stone was found in the 1960s, particularly during road works in 1966 when U.S. Route 97 was relocated through a canyon south of Biggs Junction.
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This semiprecious stone should not be confused with other ornamental stones that contain red jasper. Setonite, also called African bloodstone, is composed of red jasper, grey chalcedony, and pyrite. Dragon's Blood, sometimes called Australian bloodstone, is composed of red jasper and green epidote.
Incomplete alteration causes the physical properties of serpentines to vary widely. Antigorite is the polymorph of serpentine that most commonly forms during metamorphism of wet ultramafic rocks and is stable at the highest temperatures—to over 600 °C (1,100 °F) at depths of 60 km (37 mi) or so. In contrast, lizardite and chrysotile ...
This is intended to be a complete list of properties listed on the National Register of Historic Places in Jasper County, Texas. There are seven properties listed on the National Register in the county. Two properties are State Antiquities Landmarks one of which along with three others are Recorded Texas Historic Landmarks.