an orange pencil sharpener
An orange = une orangeles Oranges
une mandarine - a mandarine orange
He doesn't know the difference between an orange and an apple.
The correct article is "an". This is because the word "orange" starts with a vowel.
feminine when it's a fruit & masculine when it's the color orange
The gender of a word is completely contingent on the language in question. Orange in French and Spanish is feminine (une orange, una naranja). Orange in Arabic and Hebrew is masculine (portoqaal, tapuz).
In French, the word "orange" is considered to be a masculine noun.
Une orange (feminine noun)
"une mandarine"
"une valise" is a suitcase
une fois = once
Une cigogne is a stork in English.