Does [ɣ] appear in english anywhere? I've seen [ɣ] listed as occuring in the spanish word "amigo" but I don't notice any difference between it & [g]. The Arabic equivalent is [غ].
For the first question: no, it does not appear in English. As for the second part, [g], as a plosive consonant, is made by interrupting the airflow by pressing your tongue against the soft palate (velum), whereas [ɣ] is almost the same thing but the air can pass through a small space between the tongue and the velum, it is what we call a fricative consonant.