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Near Biggs jasper a stratum of white clay is sometimes found, locally named "wascoite" for the town of Wasco, Oregon. It is probably the end form of much-weathered volcanic debris. Also often found together with Biggs jasper is a dark gray, somewhat translucent chert. It formed from colloidal silica released from the volcanic debris. Because of ...
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.
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 .
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Jasper is a form of iron-rich chert and as such it is microgranular, composed of microscopic silica sediments. It is opaque, only translucent in very thin sections, and is, in fact, a rock. There are numerous texts that detail the differences between quartz, chalcedony, chert, and jasper, none of which seem to be sited here.
Chert (/ tʃ ɜːr t /) is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz, [1] the mineral form of silicon dioxide (SiO 2). [2] Chert is characteristically of biological origin, but may also occur inorganically as a chemical precipitate or a diagenetic replacement, as in petrified wood. [3]
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