This amber is less tough than Baltic amber and does not contain succinic acid. Important sources of retinite include the Dominican Republic and Mexico. Retinite does not contain any amount of succinic acid; it can be classed from the "Tertiary" ("Oligocene") period. All Dominican amber will turn a fluorescent blue or green shades when exposed to UV light.
This amber is also found with the Baltic amber and it is believed the resin is closely related to the "white pine" species. Though it closely resembles succinate but it is a brittle not hard amber, with a low melting point and does not contains succinic acid
This type of amber can be found in Saxony and is a soft amber type resin.
This amber is rare and comes in an earthy-brown knots; it's an opaque color. This type of amber is said to be close to the gutta-percha. The gutta-percha is a type of tropical tree that is native in Southeast Asia, South Taiwan to Malaya, east of the Solomon Islands and Northern Australasia. Beckerite is also found with Baltic amber, though nicknamed "brown resin".
This amber is also a brittle dark brown to black color resin that lacks in succinic acid. This is the reason it's known as "black resin".
This amber is a dark brown resin that is clear with abundant fossils.
This amber can be found in Switzerland.
This type of amber is also named Simeto or Giaretta after the river of the same name. It can be found washed ashore by the sea near Catania. This mineral has a wide range of tints; and is commonly red in color.
This type of amber has a darkish red color to the resin.
This amber is known as Burmese amber. Little information was known about this type until the British occupied Burma.
There are many fossil type resins that resemble amber. One is Schraufite and is a red resin that comes from the sandstone in Carpathian. Ambrite is another fossil that is found in many of the coal mines in New Zealand. Copaline is known to be found in the North London area. Chemawinite is also an amber like resin that comes from the Canadian Saskatchewan River. This class type of amber is plentiful.
There are some ambers that are treated to help show different effects and color. The heating of amber causes fractures that assist in adding character to pieces of clear amber. There are some amber pieces that are painted and then heated to show different colors. The amber with too many bubbles may be placed in hot oil or placed in a vacuum chamber to eliminate the bubbles. Any treated amber is genuine amber but is not natural Baltic amber.