Search results
Results from the WOW.Com Content Network
Jasper breaks with a smooth surface and is used for ornamentation or as a gemstone. It can be highly polished and is used for items such as vases, seals, and snuff boxes. The density of jasper is typically 2.5 to 2.9 g/cm 3. [4] Jaspillite is a banded-iron-formation rock that often has distinctive bands of jasper.
Jasper-quartz pebble conglomerate found near Bruce Mines, Ontario, Canada. Jasper conglomerate is an informal term for a very distinctive Paleoproterozoic quartz and jasper pebble conglomerate that occurs within the middle part of the Lorrain Formation of the Cobalt Group of the Huronian Supergroup.
The altered rock remained plastic, and subject to local movement as a result of pressure changes. These caused the great variety of marbled, rosette-like and picture designs found in Biggs jasper. [1] (p 59) Near Biggs jasper a stratum of white clay is sometimes found, locally named "wascoite" for the town of Wasco, Oregon. It is probably the ...
Jaspillite (or jaspilite), also called itabirite or jasper taconite, is a chemical rock formed similar to chert, but is generally quite iron-rich. Jaspillite is typically a banded mixture of hematite and quartz common in the banded iron formation rocks of Proterozoic and Archaean age in the Canadian Shield .
In these locales, it occurs as thick beds of Paleoproterozoic pebble conglomerate within the medial part of a geologic formation that is named the Lorrain Formation of the Cobalt Group. The jasper conglomerate consists of subrounded pebbles of red jasper, black chert, white quartzite, hematite, and semi-transparent quartz in a matrix of ...
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]
Carmelo Formation (conglomerate) at Point Lobos Nagdong Formation at Sangju. Conglomerate (/ k ən ˈ ɡ l ɒ m ər ɪ t /) is a sedimentary rock made up of rounded gravel-sized pieces of rock surrounded by finer-grained sediments (such as sand, silt, or clay). The larger fragments within conglomerate are called clasts, while the finer sediment ...
The Old Man of Hoy in Orkney is a rock pillar that from certain angles is said to resemble a standing man. [3] Queen Victoria's Rock on the Isle of Barra is a rock formation near Northbay on the north side of the A888, looking toward the west, which resembles the profile of the elderly Queen Victoria. [4]