Jasperoid is a rare, peculiar type of metasomatic alteration and occurs in two main forms; sulfidic jasperoids and hematitic jasperoids. True jasperoids are different from jaspillite, which is a form of metamorphosed chemical sedimentary rock, and from jasper which is a chemical sediment.

Jasperoid in the United States; its characteristics, origin, and economic significance Professional Paper 710 By: T.G. Lovering

This paper considers only those jasperoids formed by replacement of limestone. Major problems involved in the origin of such jasperoid include: source of the silica; nature of solutions that dissolve, transport, and precipitate silica; and the mechanism of replacement of …

Definition of jasperoid i. A dense, usually gray, chertlike siliceous rock, in which chalcedony or cryptocrystalline quartz has replaced the carbonate minerals of limestone or dolomite; a silicified limestone.

Jasperoids within the Discovery Trend have a silicified-mosaic texture with finer grain sizes found in organic-rich areas.

Jasperoid is a rare and peculiar type of metasomatic alteration of rocks. It is formed by extreme alteration of wall rocks within a shear zone which may occur in sediments, andesites, trachytes and basalts. What is Jasperoid? In this section, we will learn more about properties of Jasperoid i.e. physical and thermal properties.

Jasperoid is a rare, peculiar type of metasomatic alteration of rocks. Jasperoid is available in black, brown, colourless, green, grey, pink, white colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface.

The term jasperoid is most commonly applied to finely altered, silica-flooded rocks associated with metallic mineralization (Emmons, 1917; Locke, 1926). Multi-generation, commonly fine-grained silica replacement and quartz veinlets are often associated with gold-silver mineralization.

This paper considers only those jasperoids formed by replacement of limestone. Major problems involved in the origin of such jasperoid include: source of the silica; nature of solutions that dissolve, transport, and precipitate silica; and the mechanism of replacement of …

Jasperoid refers to a type of rock that has been altered by hydrothermal fluids, leading to the formation of jasper. This alteration process results in the transformation of an originally different rock type into a colorful, often patterned, material used for various purposes in ancient cultures.