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A block of granite in 2017 from the Fletcher Granite Company. The granite is described as a light gray or light pinkish-gray to a medium, slightly pinkish or pinkish and greenish-gray biotite granite with spots from 0.2 to 0.5 inches (5.1 to 12.7 mm) across and in some cases tapering out to 1 inch (25 mm) in length. [1]
Larger round greenish spots are feldspar. Lighter colored stones or ones with translucent areas are likely due to canasite. The yellowish brown spots are tinaksite, which was discovered at the same time as charoite was. Charoite's silky, fibrous structure results in a shimmery looking polished stone.
Chrysoprase (also spelled chrysophrase) is a green variety of chalcedony, which has been colored by nickel oxide. (The darker varieties of chrysoprase are also referred to as prase. However, the term prase is also used to describe green quartz and to a certain extent is a color-descriptor, rather than a rigorously defined mineral variety.)
The word prasiolite literally means "scallion green-colored stone" and is derived from Greek πράσον prason meaning "leek" and λίθος lithos meaning "stone". The mineral was given its name due to its green-colored appearance. Natural prasiolite is a very light, translucent green. Darker green quartz is generally the result of ...
The dominant green epidote in unakite rocks is the metasomatic alteration product of plagioclase feldspar, while the orthoclase and quartz crystals remain unaffected. Distribution [ edit ]
This semiprecious stone should not be confused with other ornamental stones that contain red jasper. Setonite, also called African bloodstone, is composed of red jasper, grey chalcedony, and pyrite. Dragon's Blood, sometimes called Australian bloodstone, is composed of red jasper and green epidote.
Chlorastrolite, also known as Isle Royale Greenstone, is a green or bluish green stone. [1] Chlorastrolite has finely radiating or stellate (for examples, see crystal habits) masses that have a "turtleback" pattern. The stellate masses tend to be chatoyant, meaning they have a varying luster. This chatoyancy can be subtranslucent to opaque.
Greenschist is defined by the presence of the minerals chlorite, epidote, or actinolite, which give the rock its green color. Greenschists also have pronounced schistosity . [ 3 ] Schistosity is a thin layering of the rock produced by metamorphism (a foliation ) that permits the rock to easily be split into flakes or slabs less than 5 to 10 ...
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