Moss agate – Prefab Building – china Villa
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
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Silica minerals
Crystalline
Coesite Cristobalite Moganite Quartz Stishovite Tridymite
Cryptocrystalline
Chalcedony Chert Flint Jasper
Amorphous
Fulgurite Lechatelierite Opal
Miscellaneous
Quartzite Tiger’s eye
Notable varieties
Chalcedony
Agate Carnelian Chrome chalcedony Chrysoprase Heliotrope Moss agate Lake Superior agate Onyx
Jasper / Chert
Mozarkite Orbicular jasper
Opal
Fiorite Geyserite
Quartz
Amethyst Ametrine Citrine Milky quartz Rose quartz Smoky quartz Shocked quartz
Categories: Mineral stubs | Quartz varieties
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