Moss agate

Moss agate pebble, 1 inch (25 mm) long.

Montana moss agate

Moss agate (also called mocha stone) is a semi-precious gemstone formed from silicon dioxide. This mineral is commonly found in limestone and granite. It is a form of agate which includes minerals of a green colour embedded in the chalcedony, forming filaments and other patterns suggestive of moss. It also sometimes resembles blue-cheese. The field is a clear or milky-white quartz, and the included minerals are mainly oxides of manganese or iron. Moss agate is of the white variety with green inclusions that resemble moss. It occurs in many locations. The colors are formed due to trace amounts of metal present as an impurity, such as chrome or iron. The metals can make different colors depending on their valence.

Despite its name, moss agate does not contain organic matter and is usually formed from weathered volcanic rocks.

Montana moss agate is an agate found in the alluvial gravels of the Yellowstone River and its tributaries between Sidney and Billings, Montana. The agate originally was formed in the Yellowstone National Park area of Wyoming as a result of volcanic activity. In Montana moss agate the red color is the result of iron oxide and the black color is the result of manganese oxide.

External links

• Mindat with location data

This article about a specific mineral or mineraloid is a stub. You can help Wikipedia by expanding it.v · Categories: Quartz varieties Mineral stubs Wikimedia Foundation. 2010. Игры ⚽ Нужна курсовая? Plesiochronous difference List of Phoenix Coyotes players Look at other dictionaries: Moss agate — Moss Moss (m[o^]s; 115), n. [OE. mos; akin to AS. me[ o]s, D. mos, G. moos, OHG. mos, mios, Icel. mosi, Dan. mos, Sw. mossa, Russ. mokh , L. muscus. Cf. {Muscoid}.] 1. (Bot.) A cryptogamous plant of a cellular structure, with distinct stem and… …   The Collaborative International Dictionary of English moss agate — n. a kind of agate containing dark colored, branchlike markings of manganese or iron oxides …   English World dictionary Moss Agate Creek — ist der Name zweier Flüsse in den Vereinigten Staaten: Moss Agate Creek (Cheyenne River), ein Fluss im US Bundesstaat South Dakota Moss Agate Creek (La Prele Creek), ein Fluss im US Bundesstaat Wyoming Siehe auch: Agate (Begriffsklärung) Agate… …   Deutsch Wikipedia Moss agate glass — Detail from a Moss Agate vase by John Northwood, c.1888 Moss Agate glass is a type of art glass developed in 1888 at the noted glasshouse Stevens Williams by glassmaker John Northwood, with the assistance of Will Bridges, then manager of the firm …   Wikipedia moss agate — a kind of agate or chalcedony containing brown or black mosslike dendritic markings from various impurities. [1790 1800] * * * ▪ mineral also called  mocha stone        grayish to milky white agate (q.v.), a variety of the silica mineral quartz… …   Universalium moss agate — noun an agate resembling moss with brown, black, or green markings • Hypernyms: ↑agate …   Useful english dictionary moss agate — noun agate with moss like dendritic markings …   English new terms dictionary moss agate — /ˈmɒs ægət/ (say mos aguht) noun a kind of agate or chalcedony containing brown or black moss like dendritic markings from various impurities …   moss agate — noun Date: 1798 an agate mineral containing brown, black, or green mosslike or dendritic markings …   New Collegiate Dictionary moss-agate — n. Mocha stone …   New dictionary of synonyms 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”