Peltier citrus family marbles have some specific characteristics.

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Base glass.will be a milky translucent white. Colors of the ribbons determine the type of citrus.

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There are six primary types but variations do occur such as "burnt" specimens.  

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White base glass, opaque yellow and transparent blue ribbons - Blueberry Citrus

White base glass, transparent red and green ribbons - Christmas Tree Citrus

White base glass, transparent blue and opaque orange / red ribbons - Liberty Citrus

White base glass, opaque yellow and transparent green ribbons possible some hints of orange - Lemon Lime Citrus

White base glass, opaque yellow ribbons and dark transparent plum - Plum Citrus

Transparent clear base glass, opaque white ribbons, opaque yellow ribbons and transparent red ribbons - Ketchup & Mustard Citrus