greenstone

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greenstone

1. any basic igneous rock that is dark green because of the presence of chlorite, actinolite, or epidote
2. a variety of jade used in New Zealand for ornaments and tools

Greenstone

 

the name given to igneous rocks that have undergone regional metamorphism at low temperatures and whose color is determined by the high content of green minerals (chlorite, amphibole) formed out of primary magmatic minerals and glass. Mainly volcanic and, less often intrusive rocks that are basic, intermediate, and sometimes acid (rhyolite) in composition and that are formed in folded regions are altered into greenstone. In regions where greenstone is wide-spread, such as the Urals and the state of Nevada in the USA, it serves as an indicator of pyrite deposits.

REFERENCES

Winkler, H. Genezis metamorficheskikh porod. Moscow, 1969. (Translated from German.)
Marakushev, A. A.Problemy mineral’nykhfatsii metamorficheskikh i metasomaticheskikh gornykh porod. Moscow, 1965.

greenstone

[′grēn‚stōn]
(mineralogy)
(petrology)
Any altered basic igneous rock which is green due to the presence of chlorite, hornblende, or epidote.

greenstone

A basic igneous rock having a green color due to iron-bearing silicate minerals; quarried and fabricated for structural and decorative dimension stone.
References in periodicals archive ?
CDP's head of partnerships, Paul Robbins, added: "CDP is committed to working with providers of enabling software solutions like Greenstone to help make the reporting process simpler and more reliable for companies.
SCENE: The junction of Greenstones Way and Brackenberry Crescent at Redcar, where a school crossing patrol woman working at Wheatlands Primary, inset, was injured.
When the Greenstones Estate (positioned at the end of Redcar Lane) was completed back in 2001 it was hailed as one of the most well respected and peaceful areas to live.
I cringe to imagine what will happen when these youngsters grow up - though having seen Greenstones' only shopping complex and nursery burnt to cinders only last year, nothing surprises me.
The Company's project tenements are largely confined to the Eastern Goldfields Granite Greenstone Terrane (EGGGT) immediately east of the Ida Shear which forms the boundary with the Southern Cross Granite Greenstone Terrane (SCGGT) to the west.
Stratigraphic relationships of the southern Mount Ida greenstone belt indicate that the ultramafic- bearing eastern portion of the belt is part of the EGGGT, and that the basalts and cherts of the western portion are part of the SCGGT (e.g.
Parts of the tenements cover the Ballard Shear at the contact of the greenstone sequence and the granite gneiss to the east.
Located in the farmlands of Uruguay, the Florida Greenstone Belt is one of the world's last unexploited, gold-bearing greenstone belts.
Greenstone belts host some of the most prolific gold-producing districts of the world: examples include the Barberton goldfields in South Africa, the Mother lode region of California, multiple gold districts throughout Ontario, Canada and the Kalgoorlie district of Western Australia.
Uruguay's Florida Greenstone belt, some 15 to 20 km wide by 300 km long, is said to have the geological makings of a future world-class gold deposit, with many similarities to the W.