Amblygonite ( /æmˈblɪɡənaɪt/) is a fluorophosphate mineral, (Li,Na)AlPO4(F,OH), composed of lithium , aluminium and hydroxide deposits and is easily mistaken for albite. Its density, cleavage and flame test for lithium are diagnostic. Amblygonite forms a series with montebrasite, the low fluorine endmember. Geologic occurrence is in granite veins, and greisens. Amblygonite occurs with spodumene, tourmaline, and other lithium-bearing minerals in pegmatite veins. It contains about 10% lithium, and has been utilized as a source of lithium. The chief commercial sources have historically been the deposits of California and France.