This paper reports on the phonetic and phonological patterns of gemination in Tripolitanian Libyan Arabic (TLA). While previous studies on Arabic gemination have either focused on lexical geminates or reported results on data that contains both lexical and derived geminates, without investigating its effect on the phonetic output, the present study investigates the effect of the phonological status of a geminate on the phonetic realization. Several measurements were obtained including target segments duration, RMS amplitude and F1, F2 and F3 for the target consonants. Preliminary results suggest that the acoustic distinction between singleton and geminate consonants in TLA is dependent mainly on durational correlates. There was no evidence of differences in RMS amplitude between singleton and geminate consonants of any type. F1, F2 and F3 frequencies are found to show similar patterns for singleton and geminate types for all sounds, suggesting no gestural effects of gemination in TLA.