Final answer:
The rarest type of Dominican amber is blue, which gets its color from fluorescence caused by inclusions of hydrocarbons.
Step-by-step explanation:
The rarest type of Dominican amber is blue. While there are other colors such as yellow, orange, and red, blue amber is the rarest and most valued. Blue amber gets its color from fluorescence caused by inclusions of hydrocarbons, which trap light within the amber and produce a blue glow. This type of amber is found in only a few places in the world, and the Dominican Republic is known for its blue amber deposits.
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