by 
davoomac
ANSWERS: 4
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Onyx is a black and white banded form of agate and is composed of silicon dioxide (SiO2). According to the mindat.org database (http://www.mindat.org/), it is found primarily in Canada, US, UK, Brazil, and Germany.
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"The myth that onyx originated from the body part of Venus, known for alluring beauty, justifies the stone’s fine texture and lustrous black colour. Originally onyx is chalcedony quartz, which falls in the micro-crystalline category. It is formed in the gas cavities of lava." from: https://www.jewelinfo4u.com/facts-about-onyx
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Try a jewelry store, most have some!
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onyx is pretty common and comes in many colors.
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