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Granite is a natural source of radiation, like most natural stones. Potassium-40 is a radioactive isotope of weak emission, and a constituent of alkali feldspar , which in turn is a common component of granitic rocks, more abundant in alkali feldspar granite and syenites .
In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...
Gemstones of the World revised 5th edition, 2013 by Walter Schumann ISBN 978-1454909538 Smithsonian Handbook: Gemstones by Cally Hall, 2nd ed. 2002 ISBN 978-0789489852 hide
Goshenite is a colorless gem variety of beryl. [2] It is called the mother of all gemstones because it can be transformed into other like emerald , morganite , or bixbite . Goshenite is also referred to as the purest form of beryl since there are generally no other elements present in the stone. [ 3 ]
Aquamarine can mostly be found in granite pegmatites. [6] It can also be found in veins of metamorphic rocks that became mineralized by hydrothermal activity. [5] Dom Pedro aquamarine in the National Museum of Natural History, Washington, D.C. The largest known example is the Dom Pedro aquamarine found in Pedra Azul, Minas Gerais, Brazil, in ...
A good quality unakite is considered a semiprecious stone; it will take a good polish and is often used in jewelry as beads or cabochons and other lapidary work such as eggs, spheres and animal carvings. It is also referred to as epidotized or epidote granite.
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Other shades include cinnamon brown (cinnamon stone variety), red, and yellow. [3] Because of its inferior hardness to zircon, which the yellow crystals resemble, they have also been called hessonite from the Greek meaning inferior. [32] Grossular is found in skarns, [3] contact metamorphosed limestones with vesuvianite, diopside, wollastonite ...
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