What minerals are in greenschist?
Greenschists commonly have an abundance of green minerals such as chlorite, serpentine, and epidote, and platy minerals such as muscovite and platy serpentine. The platiness causes the tendency to split, or have schistosity.
Does schist have gold?
But in general, the higher the mica content and the larger the grains, the more you need to proceed carefully. Large-grained schists include Magma Gold, Asterix, Saturnia, and Kosmus. These dramatic stones offer vivid colors and bold movement.
What does schist look like?
Schist (/ˈʃɪst/ SHIST) is a medium-grained metamorphic rock showing pronounced schistosity. This means that the rock is composed of mineral grains easily seen with a low-power hand lens, oriented in such a way that the rock is easily split into thin flakes or plates.
Are schist rocks worth anything?
However, some varieties have an attractive appearance which makes them useful as a facing or decorative stone. Schist may be worth mining if it contains useful minerals in large concentration. Common minerals extracted from schistose metamorphic rocks are garnet, kyanite, talc and graphite.
What type of rock has gold in it?
found
Gold is most often found in quartz rock. When quartz is found in gold bearings areas, it is possible that gold will be found as well. Quartz may be found as small stones in river beds or in large seams in hillsides.
Where are greenschist facies found?
Greenschist facies prevail in the middle levels of oceanic crust and upper levels of orogenic belts. Many supracrustal rocks in Archean terranes are metamorphosed at greenschist facies, hence the name “greenstone belts.”
Can you build on mudstone?
Carboniferous mudstone and siltstone usually provide good foundation conditions, although, when fully weathered, the mudstone becomes a firm to stiff clay. Since this weathered material has a lower bearing capacity than unweathered rock, it may be necessary to place foundations below the weathered zone.