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Citrines: The Citrine is a quartz. So it has got the chemical formula SiO2. The hardness is 7 and the crystal system is trigonal. The yellow color is caused by admixed iron connections like iron oxide and iron hydroxide. The name cames from lemon. Pure Citrines are very rare. Its crystals looks like the crystals of rock crystal. In the Antiquity in the Mediterranean area this stone was processed to decorations. Citrine can be easy made of Amthyst and Smoke quartz, if they are put into fire. 500 degrees are enough. Most of the Citrines are from Brazil, Madagascar and Russia (Ural). Sculptures are also made of Citrine.

Data about the Citrine

Chemical formula SiO2

Mineral class oxides

Crystal system trigonal

Hardness 7

Density 2.65 g/cm3

Color yellow

Line color white

Gloss glass gloss

Break shell

Fissileness none

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