Citrine is a mineral, not a rock.

Citrine is a variety of quartz.

The melting point of citrine is 1650 +/- 75 Celsius. Citrine is from the quartz family and occurs naturally in nature.

Citrine is a yellow form of quartz (SiO2).

Citrine is a variety of Quartz whose color ranges from pale yellow to brown. Citrine is rarely found naturally. Most commercial Citrine is artificially heated smoky quartz or Amethyst.

To answer the question ...Natural Citrine is rare,Man made it is very common.